Ternary Strategy Research Articles

Enhanced Photocatalytic Hydrogen Evolution from Organic Ternary Heterojunction Nanoparticles Featuring a Compact Alloy‐Like Phase

AbstractOrganic semiconductor nanoparticles (NPs) are attractive photocatalysts to produce hydrogen from water splitting. Herein, a ternary strategy of incorporating crystalline n‐type molecule IDMIC‐4F into the host system made of p‐type polymer PM6 and n‐type molecule ITCC‐M is demonstrated. ITCC‐M and IDMIC‐4F form compact alloy‐like composite with shorter lattice spacing in the ternary p/n heterojunction NPs, resulting in enhanced exciton dissociation and charge transfer characteristics. As the result, an unprecedented hydrogen evolution rate (HER) of 307 mmol h−1 g−1 and a maximum apparent quantum efficiency of 5.9% at 600 nm are achieved in the optimized ternary NPs (PM6:ITCC‐M:IDMIC‐4F = 1:1.3:0.2), which is among the highest HER from organic photocatalysts to the best of the authors’ knowledge. The alloy‐like composite also improves the operational stability of ternary NP photocatalysts. This study shows that synergizing two compatible n‐type small molecules to form alloy‐like composite is a promising approach to design novel organic photocatalysts for boosting the photocatalytic hydrogen evolution efficiency.

Third component with a high LUMO energy level enables 17.69% efficiency in ternary organic solar cells

The ternary strategy is thought to be a practical method for improving the power conversion efficiency (PCE) of organic solar cells (OSCs). To create ternary OSCs, a PM6:BTP-BO-4F host blend was combined with the non-fullerene small molecule acceptor BTA3, which has a high lowest unoccupied molecular orbital (LUMO). BTA3 demonstrated complementary absorption spectra and excellent compatibility with BTP-BO-4F, which made it easier to modulate the ternary film's morphology and catch more photons. As a result, the short circuit current density increased. Additionally, BTA3's LUMO level was marginally higher than BTP- BO-4F's, which led to a higher open-circuit voltage of the TOSCs. The addition of BTA3 improved the OSCs' energy transfer and phase separation, which in turn sped up charge transfer and reduced exciton recombination. The PCE of the TOSCs included with 10 wt% BTA3 rose to 17.69% in comparison to a PCE of 16.46% based on host binary OSCs. This research demonstrated that the incorporation of BTA3 with a high LUMO level enabled the fabrication of ternary OSCs with good performance.

Improved Molecular Ordering in a Ternary Blend Enables All-Polymer Solar Cells over 18% Efficiency.

Although all-polymer solar cells (all-PSCs) show great commercialization prospects, their power conversion efficiencies (PCEs) still fall behind their small molecule acceptor-based counterparts. In all-polymer blends, the optimized morphology and high molecular ordering are difficult to achieve since there is troublesome competition between the crystallinity of the polymer donor and acceptor during the film-formation process. Therefore, it ischallenging to improve the performance of all-PSCs. Herein, a ternary strategy is adopted to modulate the morphology and the molecular crystallinity of an all-polymer blend, in which PM6:PY-82 is selected as the host blend and PY-DT is employed as a guest component. Benefiting from the favorable miscibility of the two acceptors and the higher regularity of PY-DT, the ternary matrix features a well-defined fibrillar morphology and improved molecular ordering. Consequently, the champion PM6:PY-82:PY-DT device produces a record-high PCE of 18.03%, with simultaneously improved open-circuit voltage, short-circuit current and fill factor in comparison with the binary devices. High-performance large-area (1 cm2 ) and thick-film (300nm) all-PSCs are also successfully fabricated with PCEs of 16.35% and 15.70%, respectively.Moreover, 16.5cm2 organic solar module affords an encouraging PCE of 13.84% when using the non-halogenated solvent , showing the great potential of "Lab-to-Fab" transition of all-PSCs.

Ternary All-Polymer Solar Cells with Efficiency up to 18.14% Employing a Two-Step Sequential Deposition.

Achieving a finely tuned active layer morphology with a suitable vertical phase to facilitate both charge generation and charge transport has long been the main goal for pursuing the highly efficient bulk heterojunction all-polymer solar cells (all-PSCs). Herein, a solution to address the above challenge via synergistically combining the ternary blend strategy and the layer-by-layer (LbL) procedure is proposed. By introducing a synthesized polymer acceptor (PA ), PY-Cl, with higher crystallinity into the designed host acceptor PY-SSe-V, vertical phase distribution and molecular ordering of the LbL-type ternary all-PSCs can be improved in comparison to the LbL-type PM6/PY-SSe-V binary all-PSCs. The formation of the superior bulk microstructure can not only promote charge transport and extraction properties but also reduce energetic disorder and non-radiative recombination loss, thus improving all three photovoltaic parameters simultaneously. Consequently, the PM6/(PY-SSe-V:PY-Cl) ternary all-PSCs show the best efficiency of 18.14%, which is among the highest values reported to date for all-PSCs. This work provides a facile and effective LbL-type ternary strategy for obtaining high-efficiency all-PSCs.

Small-Molecule Acceptors with Asymmetric Thieno[3,2-c]isochromene Bridged Units for Boosting the Efficiency and Stability of Fullerene-Based Organic Solar Cells

Ternary strategy is an effective approach to boost the photovoltaic performance of organic solar cells (OSCs). However, the ternary OSCs using a nonfullerene small-molecule acceptor (SMA) as the third component into the binary fullerene–donor system have not received satisfactory progress. Here, we developed a simple A–D–D′–D–A-type SMA of BDT–2TiC16–2CN, employing benzodithiophene (BDT) as an electron-donating (D′) centra, asymmetric bis(hexadecyl) thieno[3,2-c]isochromene (TiC) as an electron-donating (D) bridged unit, and cyanoindanone (CN) as a strong electron-withdrawing (A) terminal. Its thermal, optical, electrochemical, and photovoltaic properties were systemically studied. It is demonstrated that BDT–2TiC16–2CN exhibits absorption maxima at 703 nm as well as the cascaded HOMO and LUMO energy levels (−5.61/–3.96 eV) with polymers PM6 and PC71BM. Encouragingly, incorporating the BDT–2TiC16–2CN guest into the PM6:PC71BM blend, the ternary OSCs exhibit better photovoltaic properties and higher device stability than the binary OSCs. An improved PCE of 9.39% is obtained in the ternary OSCs, which is increased by 12.2% in comparison with that of the binary OSCs (8.37%). More importantly, 73.71% of the initial PCE is still maintained after 1440 h at room temperature and 67.22% after 1440 min at 65 °C. Our work indicates that BDT–2TiC16–2CN with an asymmetric TiC bridged unit is a potential SMA used as a third component to improve the device efficiency and stability for the ternary fullerene OSCs.

Alkoxy Substitution on Asymmetric Conjugated Molecule Enabling over 18% Efficiency in Ternary Organic Solar Cells by Reducing Nonradiative Voltage Loss

A ternary strategy is considered to be an efficient and simple way to further enhance the performance of organic photovoltaics (OPVs). However, the “structure–performance” correlation of the third component in the ternary device has rarely been clearly understood from the aspect of the material’s eigenproperties. Herein, this relationship is investigated in depth by employing three asymmetric skeleton nonfullerene acceptors as the third component in the host system of PM6:BTP-eC9, respectively. Compared with TB-S and TB-S1, the alkoxy-substituted TB-S1-O possesses a more stable planar conformation, a higher surface energy, and a larger ordered stacking domain due to the existence of noncovalent conformational locking (O···H). Consequently, the PM6:BTP-eC9:TB-S1-O device exhibits the highest efficiency of 18.14% as compared with the devices based on PM6:BTP-eC9:TB-S (16.16%) and PM6:BTP-eC9:TB-S1 (16.18%). Most interestingly, only the PM6:BTP-eC9:TB-S1-O device can maintain the positive effect of VOC improvement, because a significant reduction in nonradiative voltage loss can be observed in this device. Our systematic study reveals that alkoxy substitution on an asymmetric backbone is an efficient method to construct the third component for high-performance ternary organic solar cells.

Sequential deposition method processed ternary organic solar cells with efficiency of 17.92%

Bulk heterojunction (BHJ) organic solar cells (OSCs) have developed rapidly in recent years. However, the problems of BHJ OSCs such as difficulty in regulating morphology have limited its further development. Combining sequential deposition (SD) method and ternary strategy is an effective way to solve the above problems as well as achieve high-performance OSCs. Herein, we prepared SD devices based on D18-Cl/Y6 system, which possess a vertical distribution structure facilitating charge transmission and inhibiting bimolecular recombination. Compared with BHJ OSCs, the highest power conversion efficiency (PCE) of SD OSCs is increased from 16.54% to 17.16%. Moreover, highly crystalline small molecule BTR-Cl was introduced to the active layer, which further broadened the absorption spectrum of the main system, enhanced the crystallinity of molecules and improved the morphology of films. Ultimately, ternary OSCs based on SD structure obtain a best efficiency of 17.92%, with an open-circuit voltage ( V o c ) of 0.886 V, short-circuit current density ( J s c ) of 26.97 m A c m − 2 , and fill factor (FF) of 75.11%. This work demonstrates that the ternary strategy combined with SD approach is an effective method to overcome the difficulty to regulate morphology and realize high-performance OSCs. • Combining sequential deposition (SD) method and ternary strategy is an effective way to regulate the morphology of films, which achieves high-performance OSCs. • SD processing can form a vertical distribution structure inhibiting the charge recombination and facilitating the charge collection. • The introduction of BTR-Cl can further broaden the absorption spectrum of the main system, improve the morphology of films and enhance the crystallinity of molecules. • Adopting the SD structure substitutes for the BHJ structure, D18-Cl/Y6 system-based OSCs achieved an improved PCE from 16.54% to 17.16%. With the addition of BTR-Cl, the efficiency of SD OSCs based on ternary system was further increased to 17.92%.

High‐Performance Green Thick‐Film Ternary Organic Solar Cells Enabled by Crystallinity Regulation

AbstractThe power conversion efficiency (PCE) of organic solar cells (OSCs) has reached high values of over 19%. However, most of the high‐efficiency OSCs are fabricated by spin‐coating with toxic solvents and the optimal photoactive layer thickness is limited to 100 nm, limiting practical development of OSCs. It is a great challenge to obtain ideal morphology for high‐efficiency thick‐film OSCs when using non‐halogenated solvents due to the unfavorable film formation kinetics. Herein, high‐efficiency ternary thick‐film (300 nm) OSCs with PCE of 15.4% based on PM6:BTR‐Cl:CH1007 are fabricated by hot slot‐die coating using non‐halogenated solvent (o‐xylene) in the air. Compared to PM6:BTR‐Cl:Y6 blends, the stronger pre‐aggregation of CH1007 in solution induces the earlier aggregation of CH1007 molecules and longer aggregation time, and thus results in high and balanced crystallinity of donors and acceptor in CH1007‐based ternary film, which led to high‐carrier mobility and suppressed charge recombination. The ternary strategy is further used to fabricate high‐efficiency, thick‐film, large‐area, and flexible devices processed from non‐halogenated solvents, paving the way for industrial development of OSCs.

Status and prospects of ternary all-polymer organic solar cells

All-polymer solar cells (all-PSCs) exhibit tremendous potential in fields such as smart and wearable electronic devices due to the benefits of low-cost, flexibility and large-area processability. Researches related to all-PSCs is mushrooming with the development of new polymeric donor and acceptor materials and the continuous optimization of active layer morphology and device performance. It is imperative to further boost the performance of all-PSCs with more productive methods. Ternary blend strategy is widely considered as a straightforward and effective method to optimize the morphology, photovoltaic efficiency and stability. In this review, we present the recent progress in three kinds of ternary blend based all-PSCs, namely, dual-donor and dual-acceptor ternary all-PSCs and the introduction of small-molecules in binary all-PSCs, and discuss in depth how the ternary strategy in all-PSCs can improve cell performance by optimizing film morphology and charge carrier transport properties, helping readers to better understand the morphology-efficiency/stability relationship. Simultaneously, we provide a concise discussion on the challenges and opportunities for the future development of ternary all-PSCs targeting 20% efficiency.

All-Polymer Solar Cells with 17% Efficiency Enabled by the "End-Capped" Ternary Strategy.

Recently, all-polymer solar cells (all-PSCs) have received increasing attention and made tremendous progress. However, the power conversion efficiency (PCE) of all-PSCs still lags behind the polymer-donor-small-molecule-acceptor based organic solar cells, owing to the excessive phase separation with poor miscibility between polymer donor and acceptor. In this research, an "end-capped" ternary strategy is proposed by introducing PM6TPO as a third component to fabricate highly efficient all-PSCs. The PM6:PM6TPO:PY-IT based ternary devices exhibit impressive PCE of 17.0% with enhanced light absorption and optimal morphology, and the introduction of PM6TPO significantly reduces the phase separation. The ternary devices also exhibit improved stability, outstanding tolerance of active layer thickness, and high performance of 1 cm2 unit cells. More importantly, the "end-capped" ternary strategy enables efficient and facile improvement of all-PSCs performance without additional selection and complicated synthesis for the third component.

Balancing the Selective Absorption and Photon-to-Electron Conversion for Semitransparent Organic Photovoltaics with 5.0% Light-Utilization Efficiency.

Efficiently converting invisible light while allowing full visible light transmission is key to achieving high-performance semitransparent organic photovoltaics (ST-OPVs). Here, a detailed balance strategy is explored to optimize the ST-OPV via taking both absorption and carrier dynamics into consideration. Based on this principle, comprehensive optimizations are carried out, including a ternary strategy, donor:acceptor blend ratio, thickness, antireflection, etc., to compromise the invisible energy conversion and visible transmission for high-performance ST-OPVs. As a result, the opaque OPV device exhibits a champion power conversion efficiency of 19.35% (certificated 19.07%), and most strikingly, the best ST-OPV shows a remarkably high light-utilization efficiency of 5.0%, where the efficiency and the average visible transmission are 12.95% and 38.67%, respectively. An efficiency of 12.09% is achieved on the upscaled device with an area of 1.05 cm2 , demonstrating its promise for large-area fabrication. These results are among the best values for ST-OPVs. Besides, it is demonstrated that the ST-OPV exhibits good infrared light-reflection capability for thermal control. This work provides a rational design of balancing the absorbing selectivity and photon-to-electron conversion for high-performance ST-OPVs, and may pave the way toward the practical application of solar windows.

Manipulating Charge Transfer and Transport via Intermediary Electron Acceptor Channels Enables 19.3% Efficiency Organic Photovoltaics

AbstractBalancing and improving the open‐circuit voltage (Voc) and short‐circuit current density (Jsc) synergistically has always been the critical point for organic photovoltaics (OPVs) to achieve high efficiencies. Here, this work adopts a ternary strategy to regulate the trade‐off between Voc and Jsc by combining the symmetric‐asymmetric non‐fullerene acceptors that differ at terminals and alkyl side chains to build the ternary OPV (TOPV). It is noticed that the reduced energy disorder and the enhanced luminescence efficiency of TOPV enable a mitigated energy loss and a higher Voc. Meanwhile, the third component, which is distributed at the host donor–acceptor interface, acts as the charge transport channel. The prolonged exciton lifetime, the boosted charge mobility, and the depressed charge recombination promote the TOPV to obtain an improved Jsc. Finally, with synergistically improved Voc and Jsc, the TOPV delivers an optimal efficiency of 19.26% (certified as 19.12%), representing one of the highest values reported so far.

Efficient ternary organic photovoltaic using polymers donor with two absorption peaks and similar HOMO levels as third component materials

The ternary strategy has been shown to be a promising approach to improve the performance of organic solar cells (OSCs). In this manuscript, the polymer donor Poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole) (PCDTBT) was doped into a D18-Cl:Y6 binary film to fabricate ternary OSCs. PCDTBT has efficient short wavelength light absorption, appropriate content of PCDTBT yielded complementary absorption spectra, and good compatibility with the D18-Cl:Y6 binary films. In addition, the lower lowest unoccupied molecular orbital levels of PCDTBT than D18-Cl allow efficient exciton dissociation and reduce charge carrier recombination within the ternary film. The optimized ternary film has a more suitable phase separation scale, smooth surface, and higher crystallinity than D18-Cl:Y6 binary films. Therefore, the appropriate content of PCDTBT as the third component material can significantly enhance the short-circuit current density (JSC) and photovoltaic performance. The results show that ternary OSCs with both D18-Cl and PCDTBT donors can achieve high performance by well-optimized light absorption, exciton dissociation, and phase separation.

High-Performance Ternary Organic Solar Cells Enabled by Introducing a New A-DA'D-A Guest Acceptor with Higher-Lying LUMO Level.

A ternary strategy is viable to minimize the trade-off between short-circuit current density (Jsc) and open-circuit voltage (Voc) in organic solar cells. Generally, the ternary OSCs can achieve a higher PCE than the binary counterparts by subtly utilizing the particular photoelectric properties of the third material. In this regard, we choose BTP-CC with a higher-lying LUMO level based on a fused TPBT (dithienothiophen[3.2-b]-pyrrolobenzothiadiazole) central framework and CC (2-(6-oxo-5,6-dihydro-4H-cyclopenta [b]thiophen-4-ylidene) malononitrile) flanking groups as the third component to broaden the light-absorption spectrum, regulate the bulk heterojunction (BHJ) morphology, improve the Voc, and reduce the charge recombination in OSCs. In addition, BTP-CC demonstrates intense intermolecular energy transfer to Y6 by fluorescence resonance energy transfer (FRET) pathway, which is due to the photoluminescence (PL) spectrum of BTP-CC covering the absorption region of Y6. The PM6:Y6:BTP-CC based ternary OSC achieves a champion PCE of 17.55%. Further investigation indicates that introduction of BTP-CC could reduce the trap states in OSCs, leading to an increased charge carrier density. Moreover, the incorporation of BTP-CC could improve the device stability. These results demonstrated that BTP-CC is important in improving the photovoltaic performance of ternary OSCs, and this work also provides a guideline for constructing ideal ternary OSCs in the future.

Achieving and Understanding of Highly Efficient Ternary Organic Photovoltaics: From Morphology and Energy Loss to Working Mechanism.

Ternary strategy, adding an additional donor (D) or acceptor (A) into conventional binary D:A blend, has shown great potential in improving photovoltaic performances of organic photovoltaics (OPVs) for practical applications. Herein, this review is presented on how efficient ternary OPVs are realized from the aspects of morphology, energy loss, and working mechanism. As to morphology, the role of third component on the formation of preferred alloy-like-phase and vertical-phase, which are driven by the miscibility tuning, is discussed. For energy loss, the effect of the third component on the luminescence enhancement and energetic disordering suppression, which lead to favorable increase of voltage, is presented. Regarding working mechanism, dilution effect and relationships between two acceptors or donor/acceptor, which explain the observed device parameters variations, are analyzed. Finally, some future directions concerning ternary OPVs are pointed out. Therefore, this review can provide a comprehensive understanding of working principles and effective routes for high-efficiency ternary systems, advancing the commercialization of OPVs.

2D/1A ternary blend system enables non-fused ring electron acceptor based polymer solar cells with improved photovoltaic parameters

Non-fused ring electron acceptors (NFRAs), whose central skeletons are selected from simple aromatic rings, have been developed to be the promising candidates to maintain a rational balance between cost and performance. In this work, a 2D/1A ternary blend system, with polymers PM6 and PTQ10 as the two donor components and small molecular BDDEH-4F as the NFRA, was designed for polymer solar cells (PSCs). Comparing with power conversion efficiencies (PCEs) of 12.16% and 8.28% for the PM6 and PTQ10 based binary active layers, respectively, the optimized PM6:PTQ10:BDDEH-4F = 0.85:0.15:1 ternary active layer could show improved photovoltaic parameters, giving a higher PCE of 13.04%. Based on Flory-Huggins interaction parameter estimations, PTQ10 is more miscible to the NFRA if compared with PM6, and thus the addition of PTQ10 in the ternary active layer would tune the morphology. Enhanced exciton dissociation, suppressed trap-assisted recombination, higher and more balanced charge mobilities, and optimized morphology were achieved for the ternary blend system, finally contributing to the improved photocurrent and fill factor. Polymer PTQ10 is a notable low cost donor. Therefore, the 2D/1A ternary strategy should provide a ternary active layer with cost saving advantage. • 2D/1A ternary active layer for non-fused ring electron acceptor. • The ternary solar cells showing PCE of 13.04%, higher than 8.28–12.16% for binary solar cells. • The ternary active layer provides cost saving advantage.

Synergetic Strategy for Highly Efficient and Super Flexible Thick‐film Organic Solar Cells

AbstractEfficient organic solar cells (OSCs) equipped with thick‐film active layers and high flexibility are of great significance for industrial preparation and practical applications. Herein, a ternary strategy coupled with a functional additive is employed to obtain efficient thick‐film flexible OSCs. A novel polymer donor PBB1‐F with good planarity is synthesized as a third component to optimize photon capture and molecular stacking. Meanwhile, a high dielectric constant polyarene ether (PAE) functional additive with strong adhesion not only greatly improves exciton dissociation efficiency, but also acts as locking cage‐like for effective enhancement of the mechanical stability of active layer. As a result, the PM6:PBB1‐F:Y6‐BO‐4Cl and PM6:PBB1‐F:BTP‐eC9 based ternary OSCs with PAE exhibit an efficiency of 17.91% and 18.51% under rigid thin‐film state, and perform better under thick‐film state of rigid (16.40% and 16.84%) and flexible (14.78% and 14.95%). Under the protection of the polymers, tight entanglement and cage‐like PAE adhesion, the elongation at break of the active layer increases by more than fourfold (27.3%), and gives a super flexible thick‐film OSCs that maintains more than 90% performance after 1000 bending cycles with a diameter of 10 mm. Overall, this work provides a new feasible scheme to effectively solve thickness sensitivity and flexibility issues in the context organic photovoltaic applications.

Non-Halogenated Solvents and Layer-by-Layer Blade-Coated Ternary Organic Solar Cells via Cascade Acceptor Adjusting Morphology and Crystallization to Reduce Energy Loss.

The power conversion efficiency (PCE) of halogenated solvent spin-coated organic solar cells (OSCs) has been boosted to a high level (>18%) by developing efficient photovoltaic materials and precise morphological control. However, the PCE of OSCs prepared from non-halogenated solvents and with a scalable printing process is far behind, limited by tough morphology manipulation. Herein, we have fabricated ternary OSCs by using layer-by-layer (LBL) blade-coating and a non-halogenated solvent. The ternary OSCs based on the PM6:IT-M(1:0.2)/BTP-eC9 active layer are processed with the hydrocarbon solvent 1,2,4-trimethylbenzene with no need of any additives and post-treatment. The vertical donor/acceptor distribution is optimized by LBL blade-coating within the PM6:IT-M(1:0.2)/BTP-eC9 active layer. The cascade acceptor IT-M blended in PM6 not only attenuates the damage of BTP-eC9 to the PM6 crystallization, leading to a dense nanofiber-like morphology, but also prefers to reside between PM6 and BTP-eC9 to form a cascade energy level alignment for a fast charge-transfer process. Finally, the improved morphology and crystallization lead to a reduced molecular recombination, low energy loss, and high open-circuit voltage. The prepared non-halogenated solvent and LBL blade-coated OSCs achieve a PCE of 17.16%. The work provides an approach to fabricate hydrocarbon solvent-processed high-performance OSCs by employing LBL blade-coating and a ternary strategy.

Ternary organic solar cells: Insights into charge and energy transfer processes

Recent advances demonstrate the efficacy of ternary strategy in organic solar cells. Such excitement is achieved by synergistic improvement in both charge dynamics and energetics. The third component serves as a bridging unit to systematically optimize the charge migration, exciton lifetime, recombination, and nanomorphology. Primarily focusing on the tactics for addressing energy transfer, charge transfer, and voltage losses, specific relationship between kinetics and energetics evolution has been thoroughly analyzed upon addition of the third component. We propose that the future design should be beyond simply complementing absorption, but rather focus on how the guest molecular could specifically address the charge and energy profile. With fine control of morphology, the maximum potential of ternary blends can be realized toward highly efficient organic solar cells.

Single-Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor.

The ternary strategy has been widely identified as an effective approach to obtain high-efficiency organic solar cells (OSCs). However, for most ternary OSCs, the nonradiative voltage loss lies between those of the two binary devices, which limits further efficiency improvements. Herein, an asymmetric guest acceptor BTP-2F2Cl is designed and incorporated into a PM1:L8-BO host blend. Compared with the L8-BO neat film, the L8-BO:BTP-2F2Cl blend film shows higher photoluminescence quantum yield and larger exciton diffusion length. Introducing BTP-2F2Cl into the host blend extends its absorption spectrum, improves the molecular packing of host materials, and suppresses the nonradiative charge recombination of the ternary OSCs. Consequently, the power conversion efficiency is improved up to 19.17% (certified value 18.7%), which represents the highest efficiency value reported for single-junction OSCs so far. The results show that improving the exciton behaviors is a promising approach to reducing the nonradiative voltage loss and realizing high-performance OSCs.