Unipolar Self-Doping Behavior in Perovskite CH3NH3PbBr3

Kai Zhu, Tingting Shi, Wan-Jian Yin, Feng Hong, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

187 Scopus Citations

Abstract

Recent theoretical and experimental reports have shown that the perovskite CH3NH3PbI3 exhibits unique ambipolar self-doping properties. Here, we show by density-functional theory calculation that its sister perovskite, CH3NH3PbBr3, exhibits a unipolar self-doping behavior - CH3NH3PbBr3 presents only good p-type conductivity under thermal equilibrium growth conditions. We further show that despite a large bandgap of 2.2 eV, all dominant defects in CH3NH3PbBr3 create shallow levels, which partially explains the ultra-high open-circuit voltages achieved by CH3NH3PbBr3-based thin-film solar cells. Our results suggest that the perovskite CH3NH3PbBr3 can be both an excellent solar cell absorber and a promising low-cost hole-transport material for lead halide perovskite solar cells.

Original languageAmerican English
Article number103902
Number of pages5
JournalApplied Physics Letters
Volume106
Issue number10
DOIs
StatePublished - 9 Mar 2015

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.

NREL Publication Number

  • NREL/JA-5900-63451

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