Journal
ACS ENERGY LETTERS
Volume 6, Issue 2, Pages 568-573Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02482
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Funding
- Research Foundation -Flanders (FWO) [12O3719N, 12Y7221N, S002019N, G098319N, 1514220N, ZW15_09-GOH6316]
- Flemish government through long-term structural funding Methusalem (CASAS2) [Meth/15/04]
- Hercules Foundation [HER/11/14]
- Belgian Federal Science Policy Office [IAP-PH05]
- KU Leuven Research Fund [C14/19/079]
- MPI
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This study reports the band-like transport of photogenerated charge carriers within all-inorganic black gamma-phase CsPbI3 thin films, with local mobilities nearly 1 order of magnitude higher than that reported for hybrid organic-inorganic lead halide perovskites. The results reveal that large polaron formation governs charge carrier transport within the material.
We report the band-like transport of photogenerated charge carriers within all-inorganic black gamma-phase CsPbI3 (gamma-CsPbI3) thin films, with local mobilities up to 270 +/- 44 cm(2)V(-1)s(-1) recorded using terahertz (THz) spectroscopy at room temperature. Temperature-dependent, high-frequency photoconductivity measurements indicate that large polaron formation governs charge carrier transport, following the Feynman polaron model. The mobility values derived using THz spectroscopy are nearly 1 order of magnitude higher than that reported for hybrid organic-inorganic lead halide perovskites and approach the theoretical limit for polarons scattering from longitudinal optical (LO) phonons. Our results identify gamma-CsPbI3 as a fascinating all-inorganic perovskite semiconductor with high charge carrier mobility for optoelectronics and reveal the effect of polaron formation on charge transport properties.
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