Superior Electron Research Articles

Fabrication of vertically well-aligned NiSi2 nanoneedle arrays with enhanced field emission properties

In this study, we demonstrated the controllable fabrication of periodic arrays of vertically well-aligned, fully-silicided NiSi2 nanoneedles with sharp nanotips on (100)Si substrates. The new approach proposed here eliminates the need for complicated and costly photolithographic processes and the use of toxic chemicals. All the produced vertical Si and NiSi2 nanoneedles were identified to be single crystalline and with the same geometric morphology and the same axial orientation of [100]. Additionally, the produced tapered NiSi2 nanoneedle array possessed excellent electron emission properties with a very low turn-on field of 0.85 V/μm, which is superior to many reported one-dimensional metal silicide nanostructures. Such an enhancement in the field emission can be attributed to the lower effective work function, sharp nanotips, single-crystalline structure, and good vertical alignment. The combination of the facile approach proposed here and superior electron emission performances make the well-ordered vertical NiSi2 nanoneedles promising candidates for vacuum nanoelectronics and field emission display applications.

Self‐Driven WSe2/Bi2O2Se Van der Waals Heterostructure Photodetectors with High Light On/Off Ratio and Fast Response

AbstractBenefiting from the superior electron mobility and good air‐stability, the emerging layered bismuth oxyselenide (Bi2O2Se) nanosheet has received considerable attention with the promising prospects for electronics and optoelectronics applications. However, the high charge carrier concentration and bolometric effect of Bi2O2Se give rise to the high dark current and relatively slow photoresponse, which severely impede further improvement of the performance of Bi2O2Se based photodetectors. Here, a WSe2/Bi2O2Se Van der Waals p‐n heterostructure is reported with a pronounced rectification ratio of 105 and a low reverse dark current of 10−11 A, as well as an enhanced light on/off ratio up to 618 under 532 nm light illumination. The device also exhibits a fast response speed of 2.6 µs and a broadband detection capability from 365 to 2000 nm due to the efficient charge separation and strong interlayer coupling at the interface of the two flakes. Importantly, the built‐in potential in the WSe2/Bi2O2Se heterostructure offers a competitive self‐powered photodetector with the light on/off ratio above 105 and a photovoltaic responsivity of 284 mA W−1. The WSe2/Bi2O2Se heterostructure shows promising potentials for high‐performance self‐driven photodetector applications.

Superior surface electron energy level endows WP2 nanowire arrays with N2 fixation functions

Nitrogen reduction reaction (NRR) under ambient conditions is always a long-standing challenge in science, due to the extreme difficulty in breaking the strong NN triple bond. The key to resolving this issue undoubtedly lies in searching superior catalysts to efficiently activate and hydrogenate the stable nitrogen molecules. We herein evaluate the feasibility of WP2 for N2 activation and reduction, and first demonstrate WP2 with an impressive ammonia yield rate of 7.13 μg h−1 cm−2, representing a promising W-based catalyst for NRR. DFT analysis further reveals that the NRR catalysis on WP2 proceeds in a distal reaction pathway, and the exceptional NRR activity is originated from superior surface electron energy level matching between WP2 and NRR potential which facilitates the interfacial proton-coupled electron transfer dynamics. The successfully unraveling the intrinsic catalytic mechanism of WP2 for NRR could offer a powerful platform to manipulate the NRR activity by tuning the electron energy levels.

Morphological exploration of chemical vapor–deposited P-doped ZnO nanorods for efficient photoelectrochemical water splitting

Photoelectrochemical (PEC) water splitting is beneficial and has received attractive attention due to a greater potential to generate hydrogen and oxygen from water by using plentiful solar light to solve the problem of energy crisis. Various active semiconductor materials are used in PEC water splitting applications. Nevertheless, in past decades, most of the researchers suggested that titanium oxide (TiO2) is the best photoanode for this type of applications. Now, Zinc oxide (ZnO) is considered a perfect substitution to TiO2 due to its comparable energy band structure and superior photogenerated electron transfer rate. In this study, bare and phosphorous-doped ZnO nanorods were successfully developed on fluorine-doped tin oxide-coated glass (FTO) substrate by chemical vapor deposition. X-ray diffraction (XRD) pattern authenticated hexagonal structure formation with strong diffraction peak of (101), which showed that ZnO nanorods were perfectly developed along c axis. The optical and morphological properties were analyzed by UV–Vis and scanning electron microscopy images. The energy-dispersive X-ray spectra demonstrated that doping agent phosphorous was present in ZnO nanorods. The PEC properties of the developed ZnO nanorods were further investigated and obtained results suggested that a small amount of phosphorous-doped ZnO nanorods enhances their PEC performance.

Fast and low temperature processed CsPbI3 perovskite solar cells with ZnO as electron transport layer

Black-phased cesium lead triiodide (γ-CsPbI3) inorganic perovskite is one of the most desirable candidates for highly efficient perovskite solar cells (PSCs) due to its intrinsic thermal stability and solvable preparation. The electron transport layer (ETL) plays crucial roles of electron extraction/transport and hole blocking in the devices. Zinc oxide (ZnO) with superior electron mobility and suitable energy level is a promising electron transport material for inorganic PSCs, but adopting ZnO as an ETL in inorganic PSCs is barely reported at present. In this work, we present low-temperature processed ZnO as an ETL in γ-CsPbI3 PSCs. The interesting phenomenon that the transition temperature of γ-CsPbI3 formation on ZnO ETL decreased from 180 °C to 130 °C is observed. The well-matched lattices of ZnO and CsPbI3 as well as nonexistent deprotonation which occurs in MAPbI3 based PSCs indicate ZnO can be a suitable electron transport material for inorganic PSCs. A power conversion efficiency of 12.22% and a high open circuit voltage of 1.14 V are obtained because of the good energy level alignment and the surface contact. This work shows ZnO can be used as a promising ETL in inorganic PSCs.

Highly active sites of NiVB nanoparticles dispersed onto graphene nanosheets towards efficient and pH-universal overall water splitting

In current research work, highly efficient and pH-universal non-noble metal based electrocatalyst (NiVB/rGO heterostructure) towards bifunctional water splitting application is fabricated via a facile chemical reduction method under ambient conditions. • Novel amorphous NiVB/rGO heterostructure is fabricated by a facile and easily scalable chemical reduction method. • The uniform dispersion of the NiVB nanoparticles over the ultrathin rGO nanosheets facilitates to prevent the agglomeration. • Unique architecture increases the electrochemical active surface area and accessibility to active sites. • The NiVB/rGO shows tremendous performance in a wide-range of pH for water splitting applications. Production of hydrogen (H 2 ) and oxygen (O 2 ) through electrocatalytic water splitting is one of the sustainable, green and pivotal ways to accomplish the ever-increasing demands for renewable energy sources, but remains a big challenge because of the uphill reaction during overall water splitting. Herein, we develop high-performance non-noble metal electrocatalysts for pH-universal water splitting, based on nickel/vanadium boride (NiVB) nanoparticles/reduced graphene oxide (rGO) hybrid (NiVB/rGO) through a facile chemical reduction approach under ambient condition. By virtue of more exposure to surface active sites, superior electron transfer capability and strong electronic coupling, the as-prepared NiVB/rGO heterostructure needs pretty low overpotentials of 267 and 151 mV to deliver a current density of 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) respectively, with the corresponding Tafel slope of 44 and 88 mV dec −1 in 1.0 M KOH. Moreover, the NiVB/rGO electrocatalysts display a promising performance in a wide-pH conditions that require low overpotential of 310, 353 and 489 mV to drive a current density of 10 mA cm −2 for OER under 0.5 M KOH, 0. 05 M H 2 SO 4 and 1.0 M phosphate buffer solution (PBS) respectively, confirming the excellent electrocatalytic performance among state-of-the-art Ni-based electrocatalysts for overall water splitting. Therefore, the interfacial tuning based on incorporation of active heterostructure may pave a new route to develop bifunctional, cost-effective and efficient electrocatalyst systems for water splitting and H 2 production.

Multiwalled Carbon Nanotube-N-Doped Graphene/Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Nanohybrid for Electrochemical Application in Intelligent Sensors and Supercapacitors.

In this study, we reported the preparation of a conducting polymeric/inorganic nanohybrid consisting of multiwalled carbon nanotubes (MWCNT), N-doped graphene (NGr), and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and its electrochemical application in intelligent sensors and supercapacitors. The multilayer thin film of the PEDOT:PSS-supported MWCNT-NGr nanohybrid was prepared by a facile layer-by-layer assembly strategy. The obtained conducting polymeric/inorganic nanohybrid modified electrode displayed superior electron transfer ability and a high specific surface area, which was used for electrochemical applications in intelligent sensors and supercapacitors. Remarkably, the fabricated amaranth sensor exhibited a broad linear range of 0.05–10 μM with a limit of detection of 0.015 μM under the optimal conditions. With the help of the response surface methodology, multivariate optimization was used as a substitute for the traditional single variable optimization to reflect the complete real effects of multivariate optimization in a sensing platform. Machine learning implemented by hybrid genetic algorithm-artificial neural network was used as an intelligent analysis model to replace the traditional regression analysis model for realizing intelligent analysis and output of sensing system. The MWCNT-NGr/PEDOT:PSS modified electrode exhibited a considerable specific capacitance of 6.5 mF cm–2 at a current density of 2.0 mA cm–2. The proposed results provided a new thought for a nanosensing platform equipped with a supercapacitor as a self-powered electrochemical energy storage system and machine learning as an intelligent analysis and output system in the near future.

Enhanced direct interspecies electron transfer with transition metal oxide accelerants in anaerobic digestion

Transition metal compounds have been widely used to enhance the anaerobic digestion (AD) performance, while the role of transition metal compounds in enhancing AD performance remains unclarified. In this work, the function of transition metal oxide accelerants (tantalum oxide, niobium oxide, hafnium oxide, and tungsten oxide) in enhanced AD systems was investigated from experimental and theoretical standpoints. Higher biogas production (565.01–617.85 mL/g VS), chemical oxygen demand degradation rate (67.17%-70.45%), total solids and volatile solids reduction rates (29.76%-34.71%, 51.83%-60.88%) were achieved in AD systems with transition metal oxide accelerants than the control (327.08 mL/g VS, 56.65%, 22.65%, and 41.18%). The first-principle density functional theory calculations, electron exchange capacity analysis, and the 16S rRNA gene pyrosequencing demonstrated superior electron transfer and exchange capacities as well as microbial consortia development in transition metal oxides-induced DIET mechanism. This work provides a promising strategy for understanding the function of high-performance accelerants in AD systems.

Tailoring MXene-Based Materials for Sodium-Ion Storage: Synthesis, Mechanisms, and Applications

Advanced electrodes with excellent rate performance and cycling stability are in demand for the fast development of sodium storage. Two-dimensional (2D) materials have emerged as one of the most investigated subcategories of sodium storage related anodes due to their superior electron transfer capability, mechanical flexibility, and large specific surface areas. Recently, 2D metal carbides and nitrides (MXenes), one type of the new 2D materials, are known to have competitive advantages in terms of high electroconductivity, terminal functional groups, large specific surface areas, tunable interlayer spacing, and remarkable safety. These advances endow MXenes and MXene-based materials with superior electrochemical performance when they are used as electrodes for sodium-ion storage. MXenes, however, share similar defects with other 2D materials, such as serious restacking and aggregation, which need to be improved in consideration of their further applications. In this review, we present the big family of MXenes and their synthetic methods. Furthermore, recent research reports related to progress on MXene-based materials for sodium storage are compiled, including materials design and reaction mechanisms in sodium-ion batteries and sodium metal batteries. Significantly, we discuss the challenges for existing MXene-based structures with respect to their future use as electrodes, such as low capacitance, aggregation, untenable termination groups, and unclear mechanisms, thereby providing guidance for future research on MXene-based materials for sodium-ion storage. MXenes and MXene-based materials for sodium storages, including sodium-ion batteries, and high-energy sodium metal batteries, are summarized in this review. Structural advances and optimization strategies toward future applications for various Na-ion storages are systematically discussed.

Facile synthesis and excellent electrochemical performance of LiMn0.6Fe0.4PO4/C with 3D conductive network

In this paper, the LiMn0.6Fe0.4PO4/C with 3D conductive network was synthesized using β-cyclodextrin (β-CD) and carbon nanotubes (CNTs) as complex carbon source by a simple preparation route which include combination of wet ball milling, spray drying, and carbothermal reduction. The unique conductive network result in the composite has sufficient contact with electrolyte and three-dimensional electron conduction path. SEM and TEM images indicate that the active materials were uniformly coated by amorphous carbon and CNTs. The addition of β-CD and CNTs not only restricted growth of active particle but also reduced electron conduction distance. The composite possesses superior electron conductivity (8.8 × 10−2 S cm−1) and Li+ diffusion efficiency (6.1 × 10−13 cm2 s−1) due to unique 3D conductive network. As a result, the prepared sample exhibits distinguished discharge capacity of 160.2 mAh g−1 at 0.2 C and 131.7 mAh g−1 capacity even in 10 C.

Bifunctional WO3 microrods decorated RGO composite as catechol sensor and optical limiter

Herein, we report the one-pot synthesis of WO3/RGO composite and its efficient electrochemical activity in catechol (CC) oxidation. Anchoring of 1-D WO3 microrods on 2-D RGO nanosheets were confirmed through the detailed physicochemical analyses (XRD, FESEM, XPS, Raman). Availability of large electrocatalytically active surface area yields the conductivity enrichment as well as significantly improved redox properties in WO3/RGO composite. Further, a 20-fold intensified oxidation signal in CV and a 4-fold increased sensitivity from differential pulse voltammetry (DPV) support the superior electron transfer rate at the surface of WO3/RGO composite. Oxidation of CC involving the transfer of two electrons via a diffusion controlled process was revealed by the electrochemical approaches. From density functional theory (DFT) simulations, the charge transfer from O 2p orbital of catechol to W 4d orbital of WO3 facilitate the oxidation of catechol molecule. Z-scan study explored the strong reverse saturable absorption at 532 nm excitation and the third-order nonlinear optical susceptibility χ(3) of 9.727 × 10−8 esu was obtained for WO3/RGO. Hence, the hydrothermally prepared WO3/RGO composite with its excellent redox properties and negative nonlinearity could be a competent material to use in electrochemical sensing and optical limiting.

Spatial configuration engineering of perylenediimide-based non-fullerene electron transport materials for efficient inverted perovskite solar cells

Abstract Due to their excellent photoelectron chemical properties and suitable energy level alignment with perovskite, perylene diimide (PDI) derivatives are competitive non-fullerene electron transport material (ETM) candidates for perovskite solar cells (PSCs). However, the conjugated rigid plane structure of PDI units result in PDI-based ETMs tending to form large aggregates, limiting their application and photovoltaic performance. In this study, to restrict aggregation and further enhance the photovoltaic performance of PDI-type ETMs, two PDI-based ETMs, termed PDO-PDI2 (dimer) and PDO-PDI3 (trimer), were constructed by introducing a phenothiazine 5,5-dioxide (PDO) core building block. The research manifests that the optoelectronic properties and film formation property of PDO-PDI2 and PDO-PDI3 were deeply affected by the molecular spatial configuration. Applied in PSCs, PDO-PDI3 with three-dimensional spiral molecular structure, exhibits superior electron extraction and transport properties, further achieving the best PCE of 18.72% and maintaining 93% of its initial efficiency after a 720-h aging test under ambient conditions.

Secondary electron emission performance of the surface Ni-doped MgO-Au thin film under continuous electron bombardment

A surface Ni-doped MgO-Au thin film was prepared by reactive magnetron sputtering and showed a superior secondary electron emission (SEE) performance under continuous electron bombardment in comparison with an undoped one. The experimental results show that the surface Ni-doping improves the electrical conductivity of MgO-Au film due to a size reduction of MgO particles and a bandgap narrowing of the surface MgO layer. Additionally, a 3.4 at% Ni-doped MgO-Au film exhibits an average SEE decay rate per hour as low as 2.6% with a reduction of 31.6% under continuous electron bombardment compared with the undoped one, and especially its SEE coefficient turns to be higher after 4-hour electron bombardment. Thus, the surface Ni-doping is an effective strategy to suppress the surface charging effect and subsequent SEE decay of MgO-Au film owing to the improvement of electrical conductivity.

Bimetallic AgAu decorated MWCNTs enable robust nonenzyme electrochemical sensors for in-situ quantification of dopamine and H2O2 biomarkers expelled from PC-12 cells

Abstract Construction of efficient and reliable biosensor for real-time quantification of neurochemicals and reactive oxygen species is highly essential for clinical analysis because of their close connection to the health of living beings, however, remains challenging. Here, we demonstrated a novel amperometric sensor based on tiny AgAu nanoparticles (~2.15 nm) decorated multiwalled carbon nanotubes (MWCNTs) with boosted sensitivity and specificity for in-vivo monitoring of extracellular dopamine (DA) and hydrogen peroxide (H2O2). According to basic analysis, AgAu-MWCNTs nanohybrid electrode showed significantly higher electroactive surface area (0.259 cm2), and superior heterogeneous electron transfer rate constant (9.25 × 102 cm s−1). Profiting from the synergism and high conductivity of nanoparticular AgAu and MWCNTs, fabricated sensor delivered excellent electrochemical activity, can quantify DA and H2O2 with a broad dynamic response in the range of 3 nM-2.3 mM and 7 nM-7.8 mM, respectively. Also, the estimated limit of detection of DA and H2O2 to be 0.23 nM and 0.59 nM, correspondingly, which is well inside the desired level for in-situ monitoring. It was successfully applied to measure DA and H2O2 concentration expelled from the PC-12 cells upon the external stimulation, signifying a potential value of such biosensor in cell biology and clinical disease and cancer analysis.

Mo-modified P/C composite as anode for high-performance sodium ion batteries

Red P is one of the most prospective anode material for sodium ion battery because of its highest theoretical capacity of 2596 mAh g−1 and satisfactory potentials for sodium ions insertion and extraction. However, the large volume expansion during cycles and poor intrinsic electronic conductivity limit the electrical performance practical application of red P. Herein, Mo-modified P/C (PMoC) composite has been prepared through a simple mechanical milling using low-cost anthracite as carbon sources to increase the electrical conductivity and adapt to the volume variation. The addition of Mo plays a crucial role in enhancing electronic conductivity and structural stability of PMoC composite during cycles. The formation of MoP2 facilitates the intimate contact of red P and Mo, providing the superior ionic diffusion and electron conducting pathways between the particles. The electrode of PMoC exhibits high reversible capacity, excellent cycling and rate performance as anode for sodium ion battery. At 0.1 and 0.5 A g−1, the PMoC electrode displays high reversible capacities of 763 and 705 mAh g−1 after 60 and 100 cycles, respectively. Due to the superior electrochemical performance, low cost and simple preparation, the PMoC composite is a prospective negative electrode material for high-performance sodium ion battery.

Recent advances of metal phosphides for Li–S chemistry

This review provides a systematic summary of active phosphides as promoters for Li–S chemistry, aiming at helping to understanding the working mechanism of phosphide promoters and guiding the design of advanced Li–S batteries. Li–S batteries have been considered as one of advanced next-generation energy storage systems owing to their remarkable theoretical capacity (1672 mAh g −1 ) and high energy density (2600 Wh kg −1 ). However, critical issues, mainly pertaining to lithium polysulfide shuttle and slow sulfur reaction kinetics, have posed a fatal threat to the electrochemical performances of Li–S batteries. The situation is even worse for high sulfur-loaded and flexible cathodes, which are the essential components for practical Li–S batteries. In response, the use of metal compounds as electrocatalysts in Li–S systems have been confirmed as an effective strategy to date. Particularly, recent years have witnessed many progresses in phosphides-optimized Li–S chemistry. This has been motivated by the superior electron conductivity and high electrocatalytic activity of phosphides. In this tutorial review, we offer a systematic summary of active metal phosphides as promoters for Li–S chemistry, aiming at helping to understanding the working mechanism of phosphide electrocatalysts and guiding the construction of advanced Li–S batteries.

Dual Functionalization of Electron Transport Layer via Tailoring Molecular Structure for High-Performance Perovskite Light-Emitting Diodes.

Great progress in modification and optimization of emission layer (EML) in perovskite light-emitting diodes (PeLEDs) results in a significant improvement in device efficiency. However, so far, less attention has been paid to the exploration of hole/electron injection and transporting layers to maximize the utilization of charge carriers for efficient and stable PeLEDs. At present, low electron mobility of electron transport layer (ETL) causes an unbalanced charge injection, and the defects at the ETL/perovskite interface limit the formation and utilization of generated excitons. Here, a series of compounds (BPBiTP, BPBiPN, and BPBiPA) flanked by diphenyl-1H-benzo[d]imidazole end groups have been developed as ETL materials, where the bridging units (benzene, naphthalene, anthracene) are manipulated to achieve dual functionality, namely, the high charge carrier mobility and effective passivation of perovskite surface. The coordinating end groups effectively reduce the trap state at the interface of ETL and EML due to their strong nucleophilic quality. H-aggregation of anthracene units and large transfer integral in BPBiPA lead to its superior electron mobility of 8.4 × 10-4 cm2 V-1 s-1 in the solid state, over 1 order of magnitude higher than that of the typical one (TPBi). Consequently, green PeLEDs with a maximum external quantum efficiency (EQE) of 19.7%, reduced efficiency roll-off, as well as extended operational lifetime have been achieved without any outcoupling technique. Our result demonstrated that optimization of ETL materials via improving both passivation capability and electron mobility is a powerful strategy for producing high-performance PeLEDs.

Comparison of carrier dynamic behavior and photocatalytic molecular oxygen activation of optimized MAPbX3 (X = I, Br)

Abstract Understanding carrier dynamic behavior including carrier lifetime and concentration, electrochemical behavior and band structure of the MAPbX3 (X = I, Br) with high crystal quality are important for improving photocatalytic applications. Herein, a facile isopropanol-assisted solvothermal strategy was demonstrated for highly yielding synthesis MAPbX3 (X = I, Br) cubic microcrystals with high crystallinity for degrading water insoluble dyes in an organic solvent system. Supported by time-dependent morphology evolution experimental evidence, a high temperature gradient inside the solution leads to natural convection which can induce the screw dislocation in microcrystals. The XRD, IR, steady-state photoluminescence (PL) spectra, fluorescence lifetimes UV–vis spectra and electrochemical tests were investigated to found a direct correlation between crystal quality (crystallinity and defects) and optical properties (PL intensity and bandgap). Importantly, MAPbBr3 displayed almost an order of magnitude more efficient photocatalytic degradation of malachite green (MG) dye in isopropanol solvent relative to those of MAPbI3, which was ascribed to good stability and superior photoinduced electron transfer for molecular oxygen activation.

Electrochemical capacitive performance of intact anaerobic granular sludge-based 3D bioanode

In search of clean, renewable and efficient supercapacitors, electrogenic microbes have been shown as a promising alternative biomaterial for energy storage. In this study, intact methanogenic granular sludge with a unique spherical structure consisting of dense microbial community was for the first time demonstrated as an efficient exoelectrogenic bioanode of supercapacitor for energy storage. The maximum capacity of 1542.7 ± 203.2 mC is achieved by the exoelectrogenic granular sludge (EGS, 20 g) based bioanode at the anodic potential of +0.2 V VS Ag/AgCl and with 5 min charge and 10 min discharge cycle. The capacitance of the EGS bioanode is 2-3 orders of magnitude higher compared to methanogenic one. The amount of EGS is found critical to the system capacitance. The electrochemical behavior of single EGS suggests the cytochromes, which had close contact with the flat graphite or gold wire electrode, plays an important role as an electron conduit between the electrochemical granule and the electrodes. The superior electron storage capacity of the EGS is probably related to its potential double-layer structure and enrichment of exoelectrogenic bacteria having conductive c-type cytochromes. This proof-of-concept study offers insights into the future development of bio-based sustainable, low cost and environmental-friendly supercapacitor.

Stable and efficient full-printable solar cells using inorganic metal oxide framework and inorganic perovskites

Inorganic perovskites such as CsPbI2Br have attracted much attention owing to their intrinsic merits of thermal stability. However, the phase instability of CsPbI2Br in real‐world operating conditions remains a major impediment to its prospective applications. Herein we report a method on enhancing the phase stabilization of inorganic perovskite CsPbI2Br and device performance in corresponding device engaged by Mg2+ ion substitution. Owing to small ionic radius and superior electron donating ability of Mg2+, a well-match in crystalline lattices between Cs+ and cubooctahedral void of Mg-substituted perovskite compounds and the reduced interaction between water molecules and perovskite all can offer stable perovskite phase of CsPbxMg1−xI2Br in ambient atmosphere. Moreover, we observed the enlarged charge diffusion lengths and more faster charge transportation rate for Mg-substituted perovskite-based device. Consequently, the resultant perovskite solar cell using CsPbxMg1−xI2Br with a full printable framework of FTO/c‐TiO2/m‐TiO2/Al2O3/NiO/carbon achieves a power conversion efficiency of 10.8%. We further noticed that a common phenomenon of energy loss in mesoporous perovskite solar cells can be significantly reduced in the case of CsPb0.98Mg0.02I2Br.