Suitable Band Gap Energy Research Articles

Synthesis of ω‐Bi 2 O 3 micropyramids with excellent photocatalytic properties

Novel triclinic bismuth oxide (ω-Bi2O3) microcrystals with a pyramid-like shape were successfully synthesised by a facile hydrothermal method. The effects of potassium sodium tartrate (KNaC4H4O6·4H2O) concentration and the reaction time on the morphology were investigated, respectively. The experimental results showed that the tartrate (C4H4O6 2–) ions were responsible for the crystal growth of pyramid-like ω-Bi2O3 at the same reaction time. The photocatalytic activity of ω-Bi2O3 pyramids was evaluated by degrading methyl orange under the visible-light irradiation, revealing the ω-Bi2O3 pyramids exhibited outstanding photocatalytic activity due to its suitable bandgap energy.

Enhanced magnetic, ferroelectric, and photocatalytic properties of (1-x)BiFeO3-xBaTiO3 (0.0 ≤ x ≤ 0.4) powders

The magnetic, ferroelectric, and photocatalytic properties of (1-x)BiFeO3-xBaTiO3 (0.0 ≤ x ≤ 0.4) powders synthesized by sol-gel method have been investigated. X-ray diffractometry confirms that the phase of the samples changed from rhombohedral to cubic with the increase in BaTiO3 content. The grain size decreases and the particle shape becomes homogeneous with the introduction of BaTiO3. BaTiO3 substitution enhances the multiferroic properties of the ceramics and the maximum remnant magnetization (0.261 emu/g) and remnant polarization (20 μC/cm2) have acquired in 0.8BiFeO3-0.2BaTiO3 and 0.7BiFeO3-0.3BaTiO3, respectively. The absorbance in ultraviolet and visible light regions is improved obviously for powder with x = 0.3. The energy band gap of the samples decreases from 2.06 eV to 1.57 eV with the introduction of BaTiO3, indicating that the excitation rate of photogenerated electron-hole pairs is improved. The highest methylene blue degradation efficiency of ~62% within 3 h under the visible light is achieved in the 0.7BiFeO3-0.3BaTiO3 which can be attributed to its suitable energy band gap and large remnant polarization.

Fabrication of Z-scheme flower-like AgI/Bi2O3 heterojunctions with enhanced visible light photocatalytic desulfurization under mild conditions

In current study, hierarchical flower-like AgI/Bi2O3 heterostructured nanocomposites were fabricated successfully by a glycothermal approach. In the production process, the various conditions such as reaction time and temperature and type of surfactant were investigated, which by optimizing these parameters, uniform flower-like AgI/Bi2O3 heterojunction nanostructures were formed. The as-obtained AgI/Bi2O3 binary nanocomposites exhibited enhanced visible-light-driven photocatalytic performance towards the desulfurization of dibenzothiophene under mild conditions. Results indicated that the porous flower-like AgI/Bi2O3 photocatalyst with suitable energy band gap (2.81 eV), has superior photocatalytic desulfurization efficiency about 93% after 2 h visible light irradiation, even after 5 recycles. The enhanced photocatalytic performance could be attributed to the special architecture and formation of Z-scheme system in the AgI/Bi2O3, which results in the efficient separation and transfer of photo-generated charge carriers. Furthermore, the photodesulfurization mechanism was deduced by active species trapping experiments and the results represented that h+ and ·O2− species played main roles in the photo-oxidation reactions.

Enhanced photocatalytic activity of Cuprous Oxide nanoparticles for malachite green degradation under the visible light radiation

Photocatalysis provides excellent potentials for the complete removal of organic pollutants in environmentally friendly ways and sustainable means of technology. It has been noted that under UV-visible light irradiation, nanostructured semiconductor metal oxides photocatalysts can degrade different organic pollutants. Taking into consideration of the photocatalytic activity, the present study deals with the synthesis of cuprous oxide (Cu2O) nanoparticles (NPs) by the sonochemical method and characterized for their physicochemical, optical, and photocatalytic properties. The powdered X-ray diffraction (XRD) analysis confirmed for the cubic phase crystalline structure while the Field emission scanning electron microscopy (SEM) supported for the icosahedron morphology. The bandgap of the synthesized Cu2O NPs was found to be 2.26 eV, which is the suitable bandgap energy so as to achieve the enhanced photocatalytic degradation efficiency. On testing for the degradation of Malachite green (MG) as a model pollutant, the synthesized Cu2O NPs demonstrated a high degradation efficiency under visible light irradiation. The observed results suggest that the synthesized Cu2O NPs are attractive photocatalysts for the degradation of toxic organic wastes in the water under visible light. Further investigation confirmed for the photocatalytic reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) under aqueous conditions with visible light.

The effect of catalyst weight on the photocatalytic performance of ZnO-Ag nanocomposites prepared by flame pyrolysis method

ZnO is the most widely used as a catalyst material for photocatalytic application due to the suitable band gap energy and the chemical stability. It was reported by our previous study that the photocatalytic performance was significantly affected by the Ag content. In this study, ZnO-Ag nanocomposite materials have been successfully fabricated by flame pyrolysis and the effects of catalyst weight ranging from 2 to 10 mg on the photocatalytic performance were also investigated. Zinc acetate and silver nitrate were used as precursors for producing ZnO-Ag nanocomposites. The catalyst products, ZnO-Ag nanocomposite, were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). While, UV Vis spectrometry was used to measure the concentration of methylene blue (MB) before and after irradiations. Photocatalytic performances of nanocomposites were performed by evaluating the degradation of MB under UV and sunlight irradiations. The photocatalytic tests showed that the best performance was attained when the Ag content was 5 wt% and the weight of catalyst was as much as 10 mg after irradiation with sunlight, where the degradation rate of MB was 98% and the rate constant was 0.09/min.

Mixed phase nano-CdS supported on activated biomass carbon as efficient visible light-driven photocatalysts.

Semiconductors are promising photocatalysts for the use of sunlight in energy conversion and environmental remediation. To this end, various synthetic pathways have been proposed to increase their photocatalytic efficiency, catalytic stability, recycle, and reuse. In this work, mixed phase CdS nanoparticles were loaded on the surface of activated biomass carbons to prepare composite photocatalysts via hydrothermal syntheses, which were further applied to photocatalytic degradation of rhodamine B (RhB) under visible irradiation. The composite photocatalysts displayed considerable specific surface area (up to 672 m2 g-1) and suitable band gap energy of ca. 2.1 eV. Due to the excellent light adsorption ability and chemical stability, these composite photocatalysts exhibited excellent photocatalytic capacity toward RhB degradation under visible irradiation. Moreover, the photocatalytic stability was also demonstrated by cyclic experiments, by which the composite photocatalysts retained over 80% of the initial catalytic activity after 4 consecutive runs.

Optoelectronic characterization of CuInGa(S)2 thin films grown by spray pyrolysis for photovoltaic application

Copper–indium gallium disulfide (CIGS) is a good absorber for photovoltaic application. Thin films of CIGS were prepared by spray pyrolysis on glass substrates in the ambient atmosphere. The films were characterized by different techniques, such as structural, morphological, optical and electrical properties of CIGS films were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), spectrophotometer and Hall effect, respectively. After optimization, the deposited films structure, grain size, and crystallinity became more important with an increase of annealing time at 370 °C for 20 min. Transmission electron microscopy (TEM) analysis shows that the interface sheets are well crystallized and the inter planer distance are 0.25 nm, 0.28 nm, and 0.36 nm. The atomic force microscopy (AFM) observation shows that the grain size and roughness can be tolerated by optimizing the annealing time. The strong absorbance and low transmittance were observed for the prepared films with a suitable energy bandgap about 1.46 eV. The Hall effect measurement system examined that CIGS films exhibited optimal electrical properties, resistivity, carrier mobility, and carrier concentration which were determined to be 4.22 × 106 Ω cm, 6.18 × 102 cm2 V−1 S−1 and 4.22 × 106 cm−3, respectively. The optoelectronic properties of CIGS material recommended being used for the photovoltaic application.

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Graphitic carbon nitride has been considered as a promising metal-free visible light photocatalyst for air pollutants oxidation due to its suitable band-gap energy and higher conduction band edge. Herein, we have developed a facile approach for dramatically downwards shifting band edge positions of carbon nitride up by about 1 eV via in-plane heterojunction with graphitic carbon units to enhance the oxidation capability of the electron holes generated from the valence band. The graphitic carbon units in junction with tri-s-triazine domains were clearly observed and its in-plane hybridization with carbon nitride was formed during the copolymerization using melamine with a small amount of m-phenylenediamine as the precursors. The direct intralayer junction between the tri-s-triazine and the graphitic carbon domain, essentially different with interlayer junction reported in literature, is able to shift downwards the band edge positions via merging electron density of states of carbon nitride with that of graphitic carbon, and thus would be beneficial for separation of photoexcited charge carriers and generation of hydroxyl radicals for the oxidation of pollutants. The hybrid photocatalyst prepared with a small quantity (less than 1%) of m-phenylenediamine and melamine as precursors has shown much enhanced NO oxidation to final products (NO2− and NO3−) and increased NO removal 10% than the one from melamine only.

Lactic Acid Assisted Solvothermal Synthesis of BiOClxI1–x Solid Solutions as Excellent Visible Light Photocatalysts

A series of BiOClxI1–x(x=0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) photocatalysts was firstly prepared by means of a facile solvothermal route with the help of lactic acid. The measured results show that the morphologies of the as-prepared samples are similar sheets with different thickness and diameters. Thinner nanosheets assembled flower-like BiOCl0.5I0.5 solid solution exhibited the highest photocatalytic activity and stability among the prepared samples for the degradation of methylene blue(MB) and methyl orange(MO) under the illumination of visible light. The excellent photocatalytic properties of BiOCl0.5I0.5 could be attributed to the high specific surface area, the suitable band gap energy and the lower recombination rate of the electrons and holes. In addition, catalyst BiOCl0.5I0.5 was further used to degradate a more complicated mixed dye (MO+RhB+MB) system under visible light, displaying an excellent photocatalytic activity. Finally, the photocatalytic mechanism of catalyst BiOCl0.5I0.5 to degradate colorful dyes was proposed. The trapping experiments of active species indicated that the holes are the main active species for the degradation of the mixed dyes.

All solution processed superstrate type Cu2ZnSnS4 (CZTS) thin film solar cell: Effect of absorber layer thickness

In this study, superstrate-type ITO/TiO2/In2S3/C2ZnSnS4 thin film solar cells were investigated. We obtained thin film solar cells by using the facile, vacuum-free solution process which has no require complex system. The C2ZnSnS4(CZTS) thin film was produced by solution process and dip-coating technique on the glass substrate and annealed at 515 °C for 30 min under argon condition. The CZTS thin film was characterized by means of XRD, micro-Raman, XPS, SEM-EDX, AFM and UV–Visible Spectrometer tools. The XRD result showed that the CZTS quaternary semiconductor crystallized in the kesterite phase formation. The Raman and X-ray photo-electron studies were conducted to support the formation of crystalline structure. The SEM and AFM images showed that the surfaces of substrate were covered with sub-micron sized CZTS absorber without any cracks. The optical study revealed that the CZTS has a suitable band gap energy about ∼1.65 eV for solar cell applications. All the layers of the CZTS solar cells including the transparent conductive oxide (TCO) ITO, TiO2/In2S3 buffers and CZTS absorber layers were also coated on the soda-lime glass by the solution process, respectively. The ITO/TiO2/In2S3/CZTS device exhibited the solar conversion efficiency of 0.7% which was the first device that all layers including TCO obtained by means of the non-vacuum processed solution method.

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

AbstractThe last few decades’ extensive research on the photoelectrochemical (PEC) water splitting has projected it as a promising approach to meet the steadily growing demand for cleaner and renewable energy in a sustainable and economically viable fashion. Among many potential photocatalysts, hematite (α‐Fe2O3) emerges as a highly promising photoanode material with favorable characteristics including visible light absorption (a suitable band gap energy), earth abundance, chemical stability, and low cost. A pronounced disadvantage of α‐Fe2O3 is its low photovoltage together with an extremely short hole diffusion length and a low electrical conductivity, which limit its PEC water oxidation performance. To make α‐Fe2O3 as a viable photocatalyst for PEC water splitting, one needs to rectify these unfavorable characteristics of α‐Fe2O3 by elaborated multiple modifications. In this review article, we introduce various modification strategies of hematite with emphasis on surface modifications to achieve low onset potential as well as high photocurrent approaching the theoretical value for solar water splitting.

Preparation and characterization of CZTS target and thin film using multi-stage hot-pressing process and pulsed laser deposition

Cu2ZnSnS4 (CZTS) is a promising material for cost-effective thin film solar cells since its suitable band gap energy and large absorption coefficient in visible light region. In this study, we develop a multi-stage hot-pressing process to make a CZTS target, and conduct a pulsed laser deposition to prepare the CZTS thin film. The CZTS target and thin films have been studied to evaluate their properties as an absorption material for the thin film solar cells. Images and composition analysis from electron probe X-ray micro analyzer confirm the porosity and atomic composition of the hot-pressed CZTS target. The X-ray diffraction pattern indicates a better crystallinity of CZTS thin film after annealing at a higher temperature. Analysis from UV–vis spectroscopy on the annealed CZTS thin films suggests a large absorption coefficient in the visible light region and a band gap energy of 1.45 eV.

Nanocrystalline Pyrite for Photovoltaic Applications

AbstractTransition metal sulfides (TMSs) are of special interest in energy conversion and storage devices. Amongst all sulfides, fool's gold or iron pyrite (FeS2) is potentially an attractive candidate for photovoltaic applications. Iron pyrite has risen to prominence due to its distinct properties and abundance in nature to meet the large scale needs. It is considered as environmentally benign solar absorber material with high absorption coefficient, α > 6 x105 cm−1 for λ ≥ 700 nm and suitable energy bandgap (Eg=0.95 eV). Numerous physical and chemical methods have been employed to deposit nanocrystalline pyrite thin films directly from source materials or indirectly by sulfuration. This review gives an overview of pyrite as a low cost photovoltaic absorber material for contemporary solar cell structures. In addition, practical approaches like the rational design of nanocomposites, band gap engineering and nanostructure synthesis of pyrite for improving its properties particularly photovoltaic properties are also deliberated. Moreover, limitations, challenges, remedies and prospects of pyrite as potential photovoltaic material are also reviewed to further advance the development of pyrite‐based solar cell configurations.

Ultrahigh efficient laser desorption ionization of saccharides by Ti-based metal-organic frameworks nanosheets

We proposed some exfoliated Ti-based metal-organic frameworks (MOFs) nanosheets as matrices with ultrahigh ionization efficiency, free matrix background, significant dispersibility and acidic resistance. Combining the features between MOFs and 2-D nanomaterials, the NTU-9 nanosheets matrix also demonstrated suitable band gap energy and superior photoabsorption properties, much better than other representative MOFs. A wide range of small molecules that involving low mass region were also analyzed with NTU-9 nanosheets as the matrices in both positive-ion and negative-ion reflector modes. The ultra-efficient NTU-9 nanosheets matrix was successfully applied to serum for quantitative determination of glucose as a clinical diagnosis indicator of diabetes mellitus.

Single-Crystal Growth of Cl-Doped n-Type SnS Using SnCl2 Self-Flux.

SnS is a promising photovoltaic semiconductor owing to its suitable band gap energy and high optical absorption coefficient for highly efficient thin film solar cells. The most significant carnage is demonstration of n-type SnS. In this study, Cl-doped n-type single crystals were grown using SnCl2 self-flux method. The obtained crystal was lamellar, with length and width of a few millimeters and thickness ranging between 28 and 39 μm. X-ray diffraction measurements revealed the single crystals had an orthorhombic unit cell. Since the ionic radii of S2- and Cl- are similar, Cl doping did not result in substantial change in lattice parameter. All the elements were homogeneously distributed on a cleaved surface; the Sn/(S + Cl) ratio was 1.00. The crystal was an n-type degenerate semiconductor with a carrier concentration of ∼3 × 1017 cm-3. Hall mobility at 300 K was 252 cm2 V-1 s-1 and reached 363 cm2 V-1 s-1 at 142 K.

Segregation of chlorine in n-type tin monosulfide ceramics: Actual chlorine concentration for carrier-type conversion

Tin monosulfide (SnS) is an attractive material for photovoltaic cells because of its suitable band-gap energy, high absorption coefficient, and non-toxic and abundant constituent elements. The primary drawback of this material is the lack of n-type SnS. We recently demonstrated n-type SnS by doping with Cl. However, the Cl-doped n-type SnS bulk ceramics exhibited an odd behavior in which carrier-type conversion but not electron carrier concentration depended on the Cl concentration. In this study, the electron probe microanalysis (EPMA) elemental mapping of Cl-doped SnS revealed continuous homogeneous regions with a relatively low Cl concentration along with the islands of high Cl concentration in which Sn/S is far from unity. The difference between the Cl concentration in the homogeneous region (determined by EPMA) and the bulk Cl concentration (determined by wavelength-dispersive X-ray fluorescence spectroscopy) increased with the increasing Cl doping amount. The carrier concentration and the Hall coefficient clearly depended on the Cl concentration in the homogeneous region. Carrier-type conversion was observed at the Cl concentration of 0.26 at. % (in the homogeneous region).

Enhancing the Structural and Spectroscopic Properties of Cr3+ Ion-Doped Ni/Cd/Zn Nanoferrite To Be Applied To Industrial Applications

Nanocrystalline Cr-doped Ni/Cd/Zn of general formula Ni0.7Cd0.1Zn0.2CrxFe2−xO4 (x $=$ 0, 0.1, 0.3, 0.5, 0.7, 1) were synthesized by coprecipitation method. X-ray analysis (XRD) confirmed that the samples had a single-phase cubic spinel structure. The morphology was studied using field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) to assure that the samples were in the nanoscale range. Spectroscopic analysis was carried out using UV-VIS-NIR spectroscopy for all samples. One can conclude that Ni0.7Cd0.1Zn0.2Cr0.5Fe1.5O4 had the most suitable energy bandgap that could be applied to the visible light region and many industrial applications. Moreover, this sample (Ni0.7Cd0.1Zn0.2Cr0.5Fe1.5O4) played an important role in the improvement of photocatalytic efficiency.

Synthesis and Analysis of TiS3 Nanoribbons

Nowadays ,there are a variety of nanoscale materials that scientists around the whole world try to find out specific nanoscale materials which they can truly apply to the industry and the academic.community. Therefore, finding cheap, non-toxic and accessible materials which can actually apply to the industry is being my core target. One-dimensional materials including nanowires, nanobelts, nanoribbons, nanotubes and nanorods that have been attracting a great research in the last few years. These materials have been demonstrated to exhibit superior electrical, optical, mechanical and thermal properties. One-dimensional materials also become the focus of intensive research due to their unique applications in mesoscopic physics and fabrication of nanoscale devices. One-dimensional nanostructures provide convenient system to investigate the dependence of electrical and thermal transport or mechanical properties on dimensionality and size reduction. Furthermore, they are also play an important role as both interconnects and functional units in fabricating electronic, optoelectronic, electrochemical and electromechanical devices with nanoscale dimensions. Metal sulfides exhibit very interesting properties in the fields of energy conversion and storage. Concerning energy conversion, many of them (FeS2, TiS3, MoS2…) show suitable band gap energy and optical properties to be used in photovoltaic systems and photo-electrochemical hydrogen generation. Furthermore, they exhibit 2D-layered structures with the possibility to develop peculiar nano-morphologies such as nanotubes, nanoplates and nanoribbons These materials can be used as nanotransistors because of their optoelectronic properties as well as potential hydrogen stores. Among all metal sulfides, TiS3 is the transition metal trichal-cogenides and quasi-one dimensional semiconductor with outstanding electronic, optoelectronic properties and easy to get. The direct optical band gap of ≈1 eV, high sensitivity and ultrahigh optical responsivities (≈3000 A/W) make them an ideal material for optoelectronic applications. Moreover, TiS3 has large surface area owing to its considerable (001) plane that TiS3 can be applied to the energy storage or hydrogen storage1~2. In this work, titanium based sulfides TiS3 one-dimensional nanostructures (nanoribbons) have been synthesized by chemical vapor deposition (CVD) method in the two-zone heating furnace. Ti and S powder as the precursors of CVD method, which were put into quartz tube and sealed by spray gun. First of all, Ti and S powders were placed between first zone furnace and second zone furnace. Second, formation of sulfides were produced by heating the quartz tube up to 700 ºC. for 40 minutes and held 20 minutes at setting temperature in vacuum. The quartz tube was cooled to 580 ºC for 2 days. The morphology, component, grain size, thickness, length and crystal structure of Ti-sulfides were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD) and raman spectrum respectively. According to the analyses, X-ray diffraction (XRD) patterns of titanium sulfureted of TiS3 sample at room temperature shows the strongest peak of preferential orientation on the (001) plane but still exhibits strong peak of S of preferential orientation on the (222) plane and strong peak of TiS2 of preferential orientation on the (001) plane. Beyond expectation, there are a lot of TiS2 exhibited which will be the significant influence of the purity of TiS3 nanoribbons. According to literatures, this accident occurs since the decomposition of TiS3 nearly below the eutectic point. The scanning electron microscopy (SEM) images of TiS3 samples with 100 μm in length, 0.5~2 μm in width and 100~200 nm in thickness are observed for TiS3. Furthermore, energy dispersive X-ray spectrometry (EDS) for the synthetized sample that the composition is uniform in agreement with the formation of single phase. The S/Ti ratio of TiS3 ratio is 2.96. Finally , the raman spectrum of every peak of TiS3 sample completely corresponds to the correct position. After doing these analyses, TiS3 nanoribbons are doing analyses of optical and electrical properties and apply to the lithium batteries. Reference: G. Gorlova, V.Ya. Pokrovskii, S.G. Zybtsev, A.N. Titov and V.N. Timofeev. Features of the Conductivity of the Quasi One Dimensional Compound TiS3 Journal of Experimental and Theoretical Physics, 2010, 111, 298–303. Tao, Y.; Wu, X.; Zhang, Y.; Dong, L.; Zhu, J.; Hu, Z. (2008). "Surface-assisted synthesis of microscale hexagonal plates and flower-like patterns of single-crystalline titanium disulfide and their field-emission properties". Crystal Growth and Design. 2990–2994

A novel hollow-hierarchical structured Bi2WO6 with enhanced photocatalytic activity for CO2 photoreduction

Converting CO2 into high-valued chemicals with sunlight is regarded as a promising way to solve the impending energy and environmental crisis. Development of efficient photocatalysts with suitable energy band gap, high stability and favorable structure is thus of very importance. Herein, a novel hierarchical Bi2WO6 photocatalyst assembled by Bi2WO6 nanosheets with a hollow and rod-shaped appearance has been developed via a facile hydrothermal process. Interestingly, we found that the hydrolysis of Bi(NO3)3 in water can produce solid Bi6O5(OH)3(NO3)5·3H2O microrods which can be transformed to hollow-hierarchical Bi2WO6 nanosheets by virtue of the Kirkendall effect. The developed Bi2WO6 nanosheets exhibit a 58 times higher specific surface area than that of bulk Bi2WO6 and a remarkable enhancement in electrochemical performance such as photocurrent and charge transfer. As a result, the hollow-hierarchical structured Bi2WO6 photocatalysts achieve a high CH4 yield of 2.6 μmol g−1 h−1, 8 times higher than that of bulk Bi2WO6. Moreover, the developed photocatalysts exhibit a high stability during the recycling experiments. This work may present a new strategy to attain hierarchical structured photocatalysts with high activity and stability toward CO2 reduction.

Studies on the developing of Nano-Structured Cu2S film for photovoltaic application

Current efforts have been given to develop new photovoltaic materials to improve the efficiency with reducing cost. The factors that have been taken into account in developing new photovoltaic materials include: a suitable energy band gap, the possibility of depositing the material using low cost deposition methods, abundance of the elements and low environmental costs with respect to the synthesis of the elements, production, operation and disposal of modules. It’s been a long time that continuous efforts has been given to find out the most appropriate material to be employed as absorber material for solar cell and some advanced material has been proposed too as potential solar cell material. Here in our present study we have taken Cu2-xS as a suitable p-type absorber layer material but the formation of stable Cu2-xS film was being difficult task. Different researchers proposed different methods among them we have found the elemental stacked layer deposition method is one of the promising technique. But this technique requires further optimization on thickness and layer no’s to get the best result with required stoichiometry. With this context we have tried to optimize the thickness and layer no’s for developing multilayer Cu2-xS thin film on the glass substrate by physical vapour deposition technique. The results obtained in this method shows that the optimum numbers of layer is 10 ensures formation of crystalline Cu2S structure with optical band gap is around 1.65 eV to 1.85 eV by different characterization technique like XRD, EDX, SEM, Spectrophotometry and PL. The I-V characteristic of Schotkey junction using silver and bulk resistance (ρb) with the sample shows semiconductor behaviour of the same. To the best of our knowledge this is the first time such type of nano-structured Cu2S film fabrication is reported.