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Polar Rotor Scattering As Atomic-level Origin Of Low Mobility And Thermal Conductivity Of Perovskite Ch3nh3pbi3

Title: Polar Rotor Scattering As Atomic-level Origin Of Low Mobility And Thermal Conductivity Of Perovskite Ch3nh3pbi3.
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Name(s): Li, Bing, author
Kawakita, Yukinobu, author
Liu, Yucheng, author
Wang, Mingchao, author
Matsuura, Masato, author
Shibata, Kaoru, author
Ohira-Kawamura, Seiko, author
Yamada, Takeshi, author
Lin, Shangchao, author
Nakajima, Kenji, author
Liu, Shengzhong, author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2017-06-30
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Perovskite CH3NH3PbI3 exhibits outstanding photovoltaic performances, but the understanding of the atomic motions remains inadequate even though they take a fundamental role in transport properties. Here, we present a complete atomic dynamic picture consisting of molecular jumping rotational modes and phonons, which is established by carrying out high-resolution time-of-flight quasi-elastic and inelastic neutron scattering measurements in a wide energy window ranging from 0.0036 to 54 meV on a large single crystal sample, respectively. The ultrafast orientational disorder of molecular dipoles, activated at similar to 165 K, acts as an additional scattering source for optical phonons as well as for charge carriers. It is revealed that acoustic phonons dominate the thermal transport, rather than optical phonons due to sub-picosecond lifetimes. These microscopic insights provide a solid standing point, on which perovskite solar cells can be understood more accurately and their performances are perhaps further optimized.
Identifier: FSU_libsubv1_wos_000404455400001 (IID), 10.1038/ncomms16086 (DOI)
Keywords: solar-cells, single-crystals, phase-transitions, transport-properties, high-performance, hot-phonon bottleneck, inorganic hybrid perovskites, iodide perovskites, methylammonium lead halide, organic cations
Publication Note: The publisher's version of record is available at https://doi.org/10.1038/ncomms16086
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000404455400001
Owner Institution: FSU
Is Part Of: Nature Communications.
2041-1723
Issue: vol. 8

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Li, B., Kawakita, Y., Liu, Y., Wang, M., Matsuura, M., Shibata, K., … Liu, S. (2017). Polar Rotor Scattering As Atomic-level Origin Of Low Mobility And Thermal Conductivity Of Perovskite Ch3nh3pbi3. Nature Communications. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000404455400001