Effects of Small Polar Molecules (MA+ and H2O) on Degradation Processes of Perovskite Solar Cells

• DOI: 10.1021/acsami.7b01348
• Publication Date: 2017-04-21T18:56:42Z
• Authors: Chunqing Ma; Dong Shen; Jian Qing; Hrisheekesh Thach...; Ming-Fai Lo; Chun-Sing Lee
• Keywords: Degradation

Degradation mechanisms of methylammonium lead halide perovskite solar cells (PSCs) have drawn much attention recently. Herein, the bulk and surface degradation processes were differentiated for first time by employing combinational studies using electrochemical impedance spectroscopy (EIS), capacitance frequency (CF), X-ray diffraction (XRD) with particular on roles small polar molecules (MA+ H2O). CF study shows that short-circuit current density PSCs is increased H2O at beginning process coupled an capacitance. On basis EIS XRD analysis, we show involves a lattice expansion process, which facilitates MA+ ion diffusion creating more efficient channels. These results provide better understanding in film.