Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4993524
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Funding
- TUM-CREATE
- Singapore Ministry of Education AcRF [RG123/14, MOE2015-T2-2-065, MOE2016-T2-1-054]
- Theoretical and Computational Science (TaCS) Center
- Thailand Research Fund [MRG6080264]
- ONR
- ARO
- Nanyang Technological University
- Center for Integrated Nanotechnologies, a U.S. DOE BES
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/P007821/1]
- Partnership for Advanced Computing in Europe (PRACE) [13DECI0317/IsoSwitch]
- EPSRC [EP/P007821/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/P007821/1] Funding Source: researchfish
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As a light absorber in photovoltaic applications, hybrid organic-inorganic halide perovskites should have long and balanced diffusion lengths for both the separated electrons and holes before recombination, which necessitates high carrier mobility. In polar semiconductors, the room-temperature carrier mobility is often limited by the scattering between carriers and the lowest-frequency optical phonon modes. Using terahertz time-domain spectroscopy, we examine the temperature evolution of these phonon modes in CH3NH3PbBr3 and obtained high carrier mobility values using Feynman's polaron theory. This method allows us to estimate the upper limit of carrier mobilities without the need to create photogenerated free carriers, and can be applied to other heteropolar semiconductor systems with large polarons. Published by AIP Publishing.
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