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In this study, we have performed a numerical simulation with SCAPS-1D software to observe the photovoltaic (PV) performance with various compositions of the perovskite CsSn(Br1−x Ix)3 and the graded bandgap effect of the absorber on the perovskite solar cell (PSC) performance. Typically, the compositional variation from Bromine (B) to Iodine (I) in pure Cesium Tin Bromide (CsSnBr3) is used to analyze the graded bandgap profile for obtaining superior performance of CsSn(Brx−1Ix)3 as an absorber. With the composition x = 0.5, CsSn(Br0.5I0.5)3 based PSC shows improved performance with a power conversion efficiency (PCE) of 21.93%, while pure perovskite CsSnBr3 based PSC shows a lower PCE of 16% with the considered parameters. We have also investigated the performance of the different graded bandgap absorber layers with constant thickness of the PSCs. High gradient back-graded absorber having a bandgap energy (Eg) of 1.49–1.8 eV exhibits a high PCE of 21.83%. It is found that graded bandgap absorbers and mixed-halide perovskites could be good alternatives to the existing perovskite materials acting as potential light absorbers.

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Exploring the Performance of the CsSn(Br1−xIx)3 Perovskite Solar Cells Using Graded Bandgap Profiles: A Theoretical Approach

  • 会议论文

  • 发表日期：

    2025年

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  • Babban Kumar Ravidas,
  • Mukesh Kumar Roy,
  • Dip Prakash Samajdar

摘要

In this study, we have performed a numerical simulation with SCAPS-1D software to observe the photovoltaic (PV) performance with various compositions of the perovskite CsSn(Br1−x Ix)3 and the graded bandgap effect of the absorber on the perovskite solar cell (PSC) performance. Typically, the compositional variation from Bromine (B) to Iodine (I) in pure Cesium Tin Bromide (CsSnBr3) is used to analyze the graded bandgap profile for obtaining superior performance of CsSn(Brx−1Ix)3 as an absorber. With the composition x = 0.5, CsSn(Br0.5I0.5)3 based PSC shows improved performance with a power conversion efficiency (PCE) of 21.93%, while pure perovskite CsSnBr3 based PSC shows a lower PCE of 16% with the considered parameters. We have also investigated the performance of the different graded bandgap absorber layers with constant thickness of the PSCs. High gradient back-graded absorber having a bandgap energy (Eg) of 1.49–1.8 eV exhibits a high PCE of 21.83%. It is found that graded bandgap absorbers and mixed-halide perovskites could be good alternatives to the existing perovskite materials acting as potential light absorbers.