Compositional engineering solutions for decreasing trap state density and improving thermal stability in perovskite solar cells

Abstract

Cation compositional engineering in methylammonium lead iodide perovskites results in a controlled defect concentration of 10 14 cm −3 and a thermally stable perovskite film. The device retains about 92% of its initial PCE even above 75 °C for more than 1000 h.