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题名: Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH3NH3PbI3
作者: Li, Bing1;  Kawakita, Yukinobu1;  Liu, Yucheng2;  Wang, Mingchao3;  Matsuura, Masato4;  Shibata, Kaoru1;  Ohira-Kawamura, Seiko1;  Yamada, Takeshi4;  Lin, Shangchao3;  Nakajima, Kenji1;  Liu, Shengzhong (Frank)2, 5
刊名: NATURE COMMUNICATIONS
发表日期: 2017-06-30
DOI: 10.1038/ncomms16086
卷: 8
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: 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.
关键词[WOS]: INORGANIC HYBRID PEROVSKITES ;  METHYLAMMONIUM LEAD HALIDE ;  HOT-PHONON BOTTLENECK ;  TRANSPORT-PROPERTIES ;  IODIDE PEROVSKITES ;  PHASE-TRANSITIONS ;  HIGH-PERFORMANCE ;  SINGLE-CRYSTALS ;  ORGANIC CATIONS ;  SOLAR-CELLS
语种: 英语
WOS记录号: WOS:000404455400001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152113
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Japan Atom Energy Agcy, Japan Proton Accelerator Res Complex, Neutron Sci Sect, Tokai, Ibaraki 3191195, Japan
2.Shaanxi Normal Univ, Natl Minist Educ, Inst Adv Energy Mat, Sch Mat Sci & Engn,Key Lab Appl Surface & Colloid, Xian 710119, Peoples R China
3.Florida State Univ, FAMU FSU Coll Engn, Mat Sci & Engn Program, Dept Mech Engn, Tallahassee, FL 32310 USA
4.Comprehens Res Org Sci & Soc, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan
5.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Li, Bing,Kawakita, Yukinobu,Liu, Yucheng,et al. Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH3NH3PbI3[J]. NATURE COMMUNICATIONS,2017,8.
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