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<p>Compositional engineering with the use of mixed cation strategies has attracted much attention in an effort to achieve high stability and power conversion efficiency (PCE) in perovskite solar cells (PSCs). In an effort to assess the effect on device performance, numerical simulations are used in this study to comprehensively assess the use of Cesium (Cs) in formamidinium lead iodide (FAPbI<sub>3</sub>). A PSC with Cs<sub>0.1</sub>FA<sub>0.9</sub>PbI<sub>3</sub> is simulated and comprehensive optimization is carried out using parameters such as active layer thickness, total defect density (<i>N</i><sub>t</sub>), shallow acceptor density (<i>N</i><sub>A</sub>), internal resistances and operating temperatures. Relative to the Cs-free compositions, the high optical absorption coefficient of approximately 5 × 10<sup>5</sup>&#xa0;cm<sup>−1</sup> in the mixed cation perovskite facilitates more efficient photogeneration. To ensure physical correctness of the obtained results, radiative recombination is considered in all simulations. With a <i>V</i><sub>OC</sub> of 1.24&#xa0;V, <i>J</i><sub>SC</sub> of 24.74&#xa0;mA&#xa0;cm<sup>−2</sup> and FF of 83.61% at room temperature, the optimized device structure, FTO/SnO<sub>2</sub>/Cs<sub>0.1</sub>FA<sub>0.9</sub>PbI<sub>3</sub>/CuI/Au, presents an excellent simulated PCE of 30.37%. In this study, impedance spectroscopy is used to obtain further insight into the interfacial transport of carriers, ionic transport and recombination processes in the device. The simulated results clearly demonstrate the use of Cs incorporation and comprehensive parameter optimization in improving the photovoltaic (PV) performance of FA-based PSCs.</p>

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Advancing mixed cation perovskite solar cells through cesium incorporation: attaining 30.37% conversion efficiency

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Yashwant Kumar Singh,
  • D. K. Dwivedi,
  • Ashish Garg

摘要

Compositional engineering with the use of mixed cation strategies has attracted much attention in an effort to achieve high stability and power conversion efficiency (PCE) in perovskite solar cells (PSCs). In an effort to assess the effect on device performance, numerical simulations are used in this study to comprehensively assess the use of Cesium (Cs) in formamidinium lead iodide (FAPbI3). A PSC with Cs0.1FA0.9PbI3 is simulated and comprehensive optimization is carried out using parameters such as active layer thickness, total defect density (Nt), shallow acceptor density (NA), internal resistances and operating temperatures. Relative to the Cs-free compositions, the high optical absorption coefficient of approximately 5 × 105 cm−1 in the mixed cation perovskite facilitates more efficient photogeneration. To ensure physical correctness of the obtained results, radiative recombination is considered in all simulations. With a VOC of 1.24 V, JSC of 24.74 mA cm−2 and FF of 83.61% at room temperature, the optimized device structure, FTO/SnO2/Cs0.1FA0.9PbI3/CuI/Au, presents an excellent simulated PCE of 30.37%. In this study, impedance spectroscopy is used to obtain further insight into the interfacial transport of carriers, ionic transport and recombination processes in the device. The simulated results clearly demonstrate the use of Cs incorporation and comprehensive parameter optimization in improving the photovoltaic (PV) performance of FA-based PSCs.