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Related Experiment Video

Updated: Jul 12, 2026

Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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A simulation-based optimization study of interface-engineered Cu2BaSnS4 based thin-film solar cells.

Rupashree Dutta1, Prachi Mohanty2, Alfa Sharma3

  • 1Symbiosis Institute of Technology, Hyderabad Campus, Symbiosis International (Deemed University), Pune, India.

Scientific Reports
|July 9, 2026
PubMed
Summary

Copper Barium Tin Sulphide (CBTS) thin-film solar cells show promise, with ZnS buffer layers achieving 19.94% efficiency. Further optimization led to a simulated 21.5% efficiency, highlighting ZnS as a viable cadmium-free option.

Keywords:
[Formula: see text]Device efficiencySCAPS 1D (solar cell capacitance simulator in 1D)SimulationSolar energy materials

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Thin-film solar cells (TFSCs) offer cost-effective photovoltaic solutions using chalcogenide absorbers like CIGS, CIS, CdTe, and CZTS.
  • Concerns over cadmium toxicity, indium/gallium costs, and CZTS efficiency limitations necessitate exploring alternative materials.
  • Copper Barium Tin Sulphide (CBTS) is a promising, low-cost chalcogenide absorber for TFSCs, but its device architecture, particularly buffer layer (BL) compatibility, requires further investigation.

Purpose of the Study:

  • To numerically investigate the impact of various sulfur-based buffer layers (BLs) on the performance of Copper Barium Tin Sulphide (CBTS) thin-film solar cells (TFSCs).
  • To identify the optimal BL material and device parameters for maximizing the photoconversion efficiency (PCE) of Pt/CBTS/variable BLs/ZnO/ITO devices.
  • To analyze the influence of temperature on device performance and understand carrier dynamics through impedance spectroscopy.

Main Methods:

  • SCAPS-1D numerical simulations were employed to model a Pt/CBTS/variable BLs/ZnO/ITO device structure.
  • The study systematically evaluated sulfur-based buffer layers including ZnS, CdS, SnS, and others.
  • Key device parameters such as thickness, band gap, doping concentration, and carrier mobility were varied to optimize performance metrics like open-circuit voltage (Voc), short-circuit current (Jsc), fill factor (FF), and PCE.

Main Results:

  • Among the tested buffer layers, Zinc Sulphide (ZnS) demonstrated the highest simulated efficiency of 19.94%.
  • Device performance degraded with increasing temperature (300-600 K) due to enhanced saturation current.
  • Further optimization of layer thicknesses, doping, and defect densities resulted in a maximum simulated PCE of 21.5% for the CBTS device with a ZnS buffer layer.

Conclusions:

  • Zinc Sulphide (ZnS) emerges as a highly effective, cadmium-free buffer layer for Copper Barium Tin Sulphide (CBTS) thin-film solar cells.
  • The simulated results indicate significant potential for achieving high-performance CBTS TFSCs with optimized device architectures.
  • This research provides a pathway for developing efficient and cost-effective alternative thin-film solar cell technologies.