期刊
NANO LETTERS
卷 17, 期 3, 页码 1727-1732出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05022
关键词
Cation effect; carrier diffusion; lifetime; time-resolved microwave conductivity; scanning photocurrent microscopy
类别
资金
- Air Force Office of Scientific Research under AFOSR [FA9550-14-1-0381]
- SRC-NRI Hans J. Coufal Fellowship
- Columbia Optics and Quantum Electronics NSF IGERT [DGE-1069240]
- INDEX
- NERC
- NIST
- AFOSR [FA9550-14-1-0268]
- National Science Foundation [DGE-1321851]
- U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- Center for Precision Assembly of Superstratic and Superatomic Solids, an NSF MRSEC [DMR-1420634]
- Columbia University
We use scanning photocurrent microscopy and time-resolved microwave conductivity to measure the diffusion of holes and electrons in a series of lead bromide perovskite single crystals, APbBr(3), with A = methylammonium (MA), formamidinium (FA), and Cs. We find that the diffusion length of holes (L(D)h(+) similar to 10-50 mu m) is on average an order of magnitude longer than that of electrons (LDe- similar to 1-5 mu m), regardless of the A-type cation or applied bias. Furthermore, we observe a weak dependence of L-D across the A-cation series MA > FA > Cs. When considering the role of the halide, we find that the diffusion of holes in MAPbBr(3) is comparable to that in MAPbI(3), but the electron diffusion length is up to five times shorter. This study shows that the disparity between hole and electron diffusion is a ubiquitous feature of lead halide perovskites. As with organic photovoltaics, this imbalance will likely become an important consideration in the optimization of lead halide perovskite solar cells.
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