Performance optimization of lead free Rb2LiGaBr6 -Cs2AgBiI6 double absorber perovskite solar cell using SCAPS-1D

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Chinese explanation / 中文解读

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Original abstract

Abstract This study presents a numerical investigation of a lead-free, double-absorber perovskite solar cell (DAPSC) utilizing environmentally friendly inorganic perovskite materials, with a focus on parameter optimization. The proposed PSC structure incorporates Rb2LiGaBr6 and Cs2AgBiI6 as absorber layers, tungsten disulfide (WS 2 ) as the electron transport layer (ETL), and molybdenum trioxide (MoO3 ) as the hole transport layer (HTL). To determine the optimal configuration, various HTLs including Cu 2 O, CBTS, MoO 3 , Cu:NiO, Sb 2 S 3 , MoTe2 , PEDOT:PSS, and CFTS are evaluated alongside ETLs such as ZnOS, CdZnS, WS 2 , In2S3 , TiO2 , ZnSe, and CdS. SCAPS-1D simulations are employed to systematically assess the effects of absorber layer thickness, HTL and ETL thickness, doping concentration, defect density, and back-contact metal work function on key photovoltaic performance metrics, including power conversion efficiency (PCE), short-circuit current density (JSC ), open-circuit voltage (VOC ), and fill factor (FF). Additionally, the study examines the influence of series and shunt resistance, and operating temperature. The optimized PSC configuration, comprising a Cs 2 AgBiI6 thickness of 100 nm, Rb2LiGaBr6 thickness of 2500 nm, and a defect density of 10 15 cm -3 , achieves a J SC of 39.459 mA/cm2 , a V OC of 1.014 V, an FF of 83.31%, and a PCE of 33.32%. These findings provide valuable insights for the advancement of high-performance, lead-free PSC designs, contributing to the development of environmentally sustainable photovoltaic technologies.

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