Observation of enhanced hot phonon bottleneck effect in 2D perovskites

被引：54

作者：

Jia, Xuguang ^{[1
]}

Jiang, Jun ^{[1
]}

Zhang, Yi ^{[2
]}

Qiu, Jianhua ^{[1
]}

Wang, Shubo ^{[1
]}

Chen, Zhihui ^{[1
]}

Yuan, Ningyi ^{[1
]}

Ding, Jianning ^{[1
,3
]}

机构：

[1] Changzhou Univ, Jiangsu Prov Cultivat Base State Key Lab Photovol, Jiangsu Collaborat Innovat Ctr Photovolta Sci & E, Sch Mat Sci & Engn, Changzhou 213164, Jiangsu, Peoples R China

[2] Hohai Univ, Coll Energy & Elect Engn, Nanjing 210098, Jiangsu, Peoples R China

[3] Jiangsu Univ, Micro Nano Sci & Technol Ctr, Zhenjiang 212013, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 14期

基金：

中国国家自然科学基金;

关键词：

LATTICE THERMAL-CONDUCTIVITY; LEAD-HALIDE PEROVSKITES; HYBRID PEROVSKITES; QUANTUM-WELLS; SPECTROSCOPY; CONFINEMENT; STABILITY; CARRIERS;

D O I：

10.1063/1.5021679

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We thoroughly investigated the carrier-phonon relaxation process in 2D halide perovskites with the general formula of (BA)(2)(MA)(n-1)PbnI3n+1, where n = 2, 3, and 4, by femtosecond transient absorption spectroscopy. A significant enhancement of the hot phonon bottleneck effect is observed in the natural multiple quantum well with n = 2 and 3. Specifically, the sample with n = 3 shows a 1000 ps hot carrier relaxation time to reach room temperature, which is 10 times longer compared with its three-dimensional counterpart. We believe that both the organic cation and quantum confinement effect are responsible for this phenomenon. The acoustic phonon cannot propagate due to the decrease in group velocity caused by the confinement effect in such a quantum well structure. In addition, the confined acoustic phonons can up- convert to optical phonons due to the presence of a "hybrid phonon" induced by the organic cation. This result suggests a promising way to obtain long- live hot carrier materials. Published by AIP Publishing.

引用

页数：5

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