TY  - JOUR
TI  - Unusual defect physics in CH3NH3PbI3 perovskite solar cell absorber
AU  - Wan‐Jian Yin
AU  - Tingting Shi
AU  - Yanfa Yan
PY  - 2014
JO  - Applied Physics Letters
DO  - 10.1063/1.4864778
UR  - https://doi.org/10.1063/1.4864778
AB  - Thin-film solar cells based on Methylammonium triiodideplumbate (CH3NH3PbI3) halide perovskites have recently shown remarkable performance. First-principle calculations show that CH3NH3PbI3 has unusual defect physics: (i) Different from common p-type thin-film solar cell absorbers, it exhibits flexible conductivity from good p-type, intrinsic to good n-type depending on the growth conditions; (ii) Dominant intrinsic defects create only shallow levels, which partially explain the long electron-hole diffusion length and high open-circuit voltage in solar cell. The unusual defect properties can be attributed to the strong Pb lone-pair s orbital and I p orbital antibonding coupling and the high ionicity of CH3NH3PbI3.
ER  -