Supercompliant and Soft (CH3NH3)3Bi2I9 Crystal with Ultralow Thermal Conductivity

被引：46

作者：

Ma, Hao ^{[1
]}

Li, Chen ^{[1
]}

Ma, Yunwei ^{[2
]}

Wang, Heng ^{[3
,4
]}

Rouse, Zachary W. ^{[5
]}

Zhang, Zhuolei ^{[3
]}

Slebodnick, Carla ^{[6
]}

Alatas, Ahmet ^{[7
]}

Baker, Shefford P. ^{[5
]}

Urban, Jeffrey J. ^{[3
]}

Tian, Zhiting ^{[1
,2
]}

机构：

[1] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA

[2] Virginia Tech, Dept Mech Engn, Blacksburg, VA 24061 USA

[3] Lawrence Berkeley Natl Labs, Mol Foundry, Berkeley, CA 94720 USA

[4] IIT, Dept Mech Mat & Aerosp Engn, Chicago, IL 60616 USA

[5] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[6] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA

[7] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 15期

关键词：

INELASTIC NEUTRON-SCATTERING; LEAD-FREE; HALIDE PEROVSKITES; SOLAR-CELLS; DEGRADATION; PERFORMANCE; TRANSPORT; PB;

D O I：

10.1103/PhysRevLett.123.155901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter, we show the phonon dispersion of (CH3NH3)(3)Bi2I9 single crystals at 300 K measured by inelastic x-ray scattering. The frequencies of acoustic phonons are among the lowest of crystals. Nanoindentation measurements verified that these crystals are very compliant and considerably soft. The frequency overlap between acoustic and optical phonons results in strong acoustic-optical scattering. All these features lead to an ultralow thermal conductivity. The fundamental knowledge obtained from this study will accelerate the design of novel hybrid materials for energy applications.

引用

页数：5

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