Unusual defect physics in CH3NH3PbI3 perovskite solar cell absorber
Wan‐Jian YinDepartment of Physics and Astronomy and Center for Photovoltaics Innovation and Commercialization, The University of Toledo , Toledo, Ohio 43606, USATingting ShiDepartment of Physics and Astronomy and Center for Photovoltaics Innovation and Commercialization, The University of Toledo , Toledo, Ohio 43606, USAYanfa YanDepartment of Physics and Astronomy and Center for Photovoltaics Innovation and Commercialization, The University of Toledo , Toledo, Ohio 43606, USA
2014en
ABI
Аннотация
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.
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