Optimization and Performance Improvement of CsSnGeI3 All-Inorganic Lead-Free Thin-Film Perovskite Solar Cell through Numerical Simulation

Tajreen Ferdoush, C. Saha, Mahdee Nafis, M. M. Hossain
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Abstract

Among different routes of the generation of electrical power, solar photovoltaic is one of the most promising and trusted technology. Organic, organic-inorganic hybrid lead-based perovskite compounds are becoming commercially appealing as absorber materials in the majority of perovskite solar cells due to high PCE (power conversion efficiency), low cost, availability of materials, and ease of production. However, as mentioned above, lead-based organic perovskite solar cells are unstable in open space. Nowadays, Sn-based inorganic perovskites are becoming more popular than lead-based perovskites as Pb-based perovskite solar cells are toxic and not environment-friendly. In this study, the thickness, doping density, defect density, energy bandgap of the absorber, and ETL (electron transport layer) and HTL (hole transport layer) materials of the cell are optimized using SCAPS-1D simulator. The final structure is FTO/ZnO/CsSnGeI3/NiO/Cu2O, where FTO works as TCO (transparent conducting oxide) layer. The optimized structure offered an open-circuit voltage (Voc) of 1.245V, a short-circuit current (Jsc) of 28.189 mA/cm2, a Fill Factor (FF) of 89.97%, and an overall PCE of 31.57%. According to the literature, this is the highest PCE for the CsSnGeI3 perovskite solar cell with all-inorganic layers. The proposed optimized structure will pave the path for the fabrication of low-cost, environment friendly and stable perovskite solar cell.
基于数值模拟的CsSnGeI3全无机无铅薄膜钙钛矿太阳能电池优化与性能提升
在不同的发电途径中,太阳能光伏发电是最具发展前景和值得信赖的技术之一。有机,有机-无机杂化铅基钙钛矿化合物由于其高PCE(功率转换效率),低成本,材料可用性和易于生产,在大多数钙钛矿太阳能电池中成为具有商业吸引力的吸收材料。然而,如上所述,铅基有机钙钛矿太阳能电池在开放空间是不稳定的。目前,锡基无机钙钛矿比铅基钙钛矿更受欢迎,因为铅基钙钛矿太阳能电池有毒且不环保。在本研究中,利用SCAPS-1D模拟器对电池的厚度、掺杂密度、缺陷密度、吸收剂能带隙以及电子输运层ETL和空穴输运层HTL材料进行了优化。最终结构为FTO/ZnO/CsSnGeI3/NiO/Cu2O,其中FTO作为TCO(透明导电氧化物)层。该结构的开路电压(Voc)为1.245V,短路电流(Jsc)为28.189 mA/cm2,填充系数(FF)为89.97%,总体PCE为31.57%。根据文献,这是具有全无机层的CsSnGeI3钙钛矿太阳能电池的最高PCE。所提出的优化结构将为低成本、环保和稳定的钙钛矿太阳能电池的制造铺平道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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