Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 7, Pages 1066-1071Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz5004022
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Funding
- US-DOE Office of Science, Division of Chemical Sciences, Geosciences and Biosciences [DE-AC02-06CH11357]
- DOE SISGR grant An Integrated Basic Research Program for Advanced Nuclear Energy Separations Systems Based on Ionic Liquids
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Halogenoplumbate perovskites (MeNH3PbX3, where X is I and/or Br) have emerged as promising solar panel materials. Their limiting photovoltaic efficiency depends on charge localization and trapping processes that are presently insufficiently understood. We demonstrate that in halogenoplumbate materials the holes are trapped by organic cations (that deprotonate from their oxidized state) and Pb2+ cations (as Pb3+ centers), whereas the electrons are trapped by several Pb2+ cations, forming diamagnetic lead clusters that also serve as color centers. In some cases, paramagnetic variants of these clusters can be observed. We suggest that charge separation in the halogenoplumbates resembles latent image formation in silver halide photography. Electron and hole trapping by lead clusters in extended dislocations in the bulk may be responsible for accumulation of trapped charge observed in this photovoltaic material.
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