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Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CHNHPbI.

Title: Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CHNHPbI.
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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 Frank, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-06-30
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Perovskite CHNHPbI 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 ∼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_pmch_28665407 (IID), 10.1038/ncomms16086 (DOI), PMC5497077 (PMCID), 28665407 (RID), 28665407 (EID), ncomms16086 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5497077.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28665407
Host 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. F. (2017). Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CHNHPbI. Nature Communications. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28665407