Composition-Dependent Hot Carrier Relaxation Dynamics in Cesium Lead Halide (CsPbX3, X = Br and I) Perovskite Nanocrystals

被引：166

作者：

Chung, Heejae ^{[1
]}

Jung, Seok Il ^{[1
]}

Kim, Hyo Jin ^{[1
]}

Cha, Wonhee ^{[1
]}

Sim, Eunji ^{[1
]}

Kim, Dongho ^{[1
]}

Koh, Weon-Kyu ^{[2
]}

Kim, Jiwon ^{[3
,4
]}

机构：

[1] Yonsei Univ, Dept Chem, 50 Yonsei Ro, Seoul 03722, South Korea

[2] Samsung Adv Inst Technol, Device Lab, Suwon 16676, Gyeonggi Do, South Korea

[3] Yonsei Univ, Sch Integrated Technol, Incheon 21983, South Korea

[4] Yonsei Univ, Underwood Int Coll, Incheon 21983, South Korea

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2017年 / 56卷 / 15期

基金：

新加坡国家研究基金会;

关键词：

electron densities; hot carriers; intraband relaxation; multiphonon emission; perovskites; OPTICAL-PROPERTIES; PHONON BOTTLENECK; HIGH-PERFORMANCE; CDSE; CL;

D O I：

10.1002/anie.201611916

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cesium-based perovskite nanocrystals (NCs) have outstanding photophysical properties improving the performances of lighting devices. Fundamental studies on excitonic properties and hot-carrier dynamics in perovskite NCs further suggest that these materials show higher efficiencies compared to the bulk form of perovskites. However, the relaxation rates and pathways of hot-carriers are still being elucidated. By using ultrafast transient spectroscopy and calculating electronic band structures, we investigated the dependence of halide in Cs-based perovskite (CsPbX3 with X = Br, I, or their mixtures) NCs on the hot-carrier relaxation processes. All samples exhibit ultrafast (< 0.6 ps) hot-carrier relaxation dynamics with following order: CsPbBr3 (310 fs) > CsPbBr1.5I1.5 (380 fs) > CsPbI3 NC (580 fs). These result accounts for a reduced light emission efficiency of CsPbI3 NC compared to CsPbBr3 NC.

引用

页码：4160 / 4164

页数：5

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