Key Words:PERFORMANCE; LAYERS

Abstract:Perovskite solar cells (PSCs) develop great potential to make photovoltaic power generation systems more cost-effective due to the high power conversion efficiency (PCE), low material cost, and easy fabrication. Alloyed A-site cations surrounded by PbI6 octahedra play decisive roles in the crystal structure, bandgap, and phase stability, as well as ion migration. Herein, based on the temperature-dependent ion conductivity measurement, the activation energy for iodide ion migration is systematically studied with different proportions of guanidinium cation (GA( )) substitution. It is found that partial GA( ) doping could effectively suppress iodide ion migration. The triple-cation perovskite (MA(0.8)FA(0.1)GA(0.1)PbI(3)) PSCs achieve a PCE of 22.17% with superior operational stability maintaining 90% of their initial efficiency after 1200 h under continuous light soaking. Furthermore, it is extended to mini perovskite solar modules, 14 cm(2) active area, and achieves a PCE of 19.18%.

Volume:6

Issue:6

Translation or Not:no