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<p>The importance of crystal orientation in CsPbI<sub>3</sub> perovskites, recognized for their outstanding optoelectronic properties, including high absorption coefficients and tunable bandgaps, is investigated within a tandem perovskite solar cell structure featuring an ITO/ZnSe/CsPbI<sub>3</sub> top cell and an ITO/ZnSe/Ag<sub>2</sub>BeSnSe<sub>4</sub> bottom cell. Among the studied orientations, through numerical simulations, we demonstrate that the orthogonal (010) configuration achieves the highest power conversion efficiency (PCE) of 21.88%. In contrast, the cubic (100) orientation exhibits the lowest PCE of 20.40%, highlighting the significance of structural anisotropy in photovoltaic performance. The tandem architecture, designed to exceed the Shockley–Queisser limit, demonstrates a remarkable PCE of 31.02%, with an open-circuit voltage (<i>V</i><sub>oc</sub>) of 2.006&#xa0;V, a short-circuit current density (<i>J</i><sub>sc</sub>) of 17.5&#xa0;mA/cm<sup>2</sup>, and a fill factor (FF) of 88.3%. Analysis of the individual sub-cells reveals PCEs of 16% for the top CsPbI3 cell and 23.32% for the bottom Ag<sub>2</sub>BeSnSe<sub>4</sub> cell, elucidating their contributions to the overall tandem efficiency. Furthermore, the study examines temperature-dependent performance, observing efficiency declines with rising temperatures and underscoring the importance of thermal management for device stability.</p>

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Beyond current limits: a simulation study of 31.02% efficient tandem photovoltaics with novel oriented CsPbI3 and Ag2BeSnSe4

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Mohamed Ait oufakir,
  • Younes Chrafih,
  • Habib Rozale,
  • Khalid Rahmani,
  • Omar Bajjou

摘要

The importance of crystal orientation in CsPbI3 perovskites, recognized for their outstanding optoelectronic properties, including high absorption coefficients and tunable bandgaps, is investigated within a tandem perovskite solar cell structure featuring an ITO/ZnSe/CsPbI3 top cell and an ITO/ZnSe/Ag2BeSnSe4 bottom cell. Among the studied orientations, through numerical simulations, we demonstrate that the orthogonal (010) configuration achieves the highest power conversion efficiency (PCE) of 21.88%. In contrast, the cubic (100) orientation exhibits the lowest PCE of 20.40%, highlighting the significance of structural anisotropy in photovoltaic performance. The tandem architecture, designed to exceed the Shockley–Queisser limit, demonstrates a remarkable PCE of 31.02%, with an open-circuit voltage (Voc) of 2.006 V, a short-circuit current density (Jsc) of 17.5 mA/cm2, and a fill factor (FF) of 88.3%. Analysis of the individual sub-cells reveals PCEs of 16% for the top CsPbI3 cell and 23.32% for the bottom Ag2BeSnSe4 cell, elucidating their contributions to the overall tandem efficiency. Furthermore, the study examines temperature-dependent performance, observing efficiency declines with rising temperatures and underscoring the importance of thermal management for device stability.