Qualifying composition dependent p and n self-doping in CH3NH3PbI3
- 20 October 2014
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 105 (16), 163508
- https://doi.org/10.1063/1.4899051
Abstract
We report the observation of self-doping in perovskite. CH3NH3PbI3 was found to be either n- or p-doped by changing the ratio of methylammonium halide (MAI) and lead iodine (PbI2) which are the two precursors for perovskite formation. MAI-rich and PbI2-rich perovskite films are p and n self-doped, respectively. Thermal annealing can convert the p-type perovskite to n-type by removing MAI. The carrier concentration varied as much as six orders of magnitude. A clear correlation between doping level and device performance was also observed.Keywords
Funding Information
- National Science Foundation (ECCS-1201384, ECCS-1252623)
- Defense Threat Reduction Agency (HDTRA1-14-1-0030)
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