Synchronized B-site alloying for high-efficiency inorganic tin–lead perovskite solar cells

• DOI: 10.1063/5.0162009
• Publication Date: 2023-12-18T10:36:53Z
• Authors: Ting Zhang; Feng Wang; Hao Chen; Feng Qian; Jian Li; Hualin Zheng; Shihao Yuan; Xuefeng Peng; Yafei Wang; Jiang Huang; Hao Cui; Zhinong Yu; Zhi David Chen; Shibin Li
• Keywords: 02 engineering and technology; 0210 nano-technology

Inorganic tin–lead perovskites with low bandgap (1.2–1.4 eV) are desired absorber materials for solar cells owing to their ideal and compositional stability. However, such currently subject inferior power conversion efficiency (PCE) the origin remains unclear. Here, first time, we report metal-cation-derived unsynchronized crystallization behavior of inorganic perovskite, exemplifying by a representative composition CsPb0.7Sn0.3I3. A tin-perovskite-targeted modulation agent, 1-(4-fluorophenyl) piperazine (1-4FP), is introduced synchronize B-site alloying through its strong targeted bonding SnI2, resulting in substantially enhanced film quality better morphology photoelectrical properties. Furthermore, first-principles molecular dynamics simulations reveal that agent regulates route toward pure phase CsPb0.7Sn0.3I3 suppressing preforming tin perovskite. With our proposed approach, best device attains PCE 17.55%, which record-high perovskite cells. In addition, treated devices show excellent stability only 10% negligible loss after being exposed 1 sun intensity 700 h stored N2 over 4000 h, respectively. Our findings open new avenue design perovskites, so as obtaining high-quality films associated