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<p>The main drawback with the perovskite solar cells involving the absorber layers such as methyl ammonium lead iodide and other hygroscopic species is that it leads to absorption of moisture from the surrounding environment by forming hydrogen bonds with water molecule. This negatively impacts the solar cell stability and performance over long time and this drives the motivation for the search of materials which contain the inorganic cations (such as Cesium, Rubidium) and which are able to provide good absorption coefficients over a wide wavelength range. In this paper, absorber material <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2795_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="110" /> </InlineMediaObject> <EquationSource Format="TEX">\(CsSn_{0.5}Ge_{0.5}I_{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>C</mi> <mi>s</mi> <mi>S</mi> <msub> <mi>n</mi> <mrow> <mn>0.5</mn> </mrow> </msub> <mi>G</mi> <msub> <mi>e</mi> <mrow> <mn>0.5</mn> </mrow> </msub> <msub> <mi>I</mi> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> for top cell is used to reduce hygroscopicity and bandgap graded <i>CIGS</i> for bottom cell is used with favourable bandgap energy range according to the filtered spectrum of top cell to utilize the filtered solar spectrum efficiently and to minimize the effect of thermalization losses at high temperatures and it was found that sensitivity of PCE with respect to temperature is lowered for tandem cell when bandgap grading is implemented and PCE of 28.72% without bandgap grading and PCE of&#xa0;28.75% with bandgap grading are obtained.</p>

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Towards highly efficient and thermally stable 2T tandem solar cells using cesium based lead free perovskite top cell and CIGS based bottom cell

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Eswar Ajay Karoti,
  • Sumit Saha

摘要

The main drawback with the perovskite solar cells involving the absorber layers such as methyl ammonium lead iodide and other hygroscopic species is that it leads to absorption of moisture from the surrounding environment by forming hydrogen bonds with water molecule. This negatively impacts the solar cell stability and performance over long time and this drives the motivation for the search of materials which contain the inorganic cations (such as Cesium, Rubidium) and which are able to provide good absorption coefficients over a wide wavelength range. In this paper, absorber material \(CsSn_{0.5}Ge_{0.5}I_{3}\) C s S n 0.5 G e 0.5 I 3 for top cell is used to reduce hygroscopicity and bandgap graded CIGS for bottom cell is used with favourable bandgap energy range according to the filtered spectrum of top cell to utilize the filtered solar spectrum efficiently and to minimize the effect of thermalization losses at high temperatures and it was found that sensitivity of PCE with respect to temperature is lowered for tandem cell when bandgap grading is implemented and PCE of 28.72% without bandgap grading and PCE of 28.75% with bandgap grading are obtained.