Size- and Temperature-Dependent Charge Transport in PbSe Nanocrystal Thin Films

被引：120

作者：

Kang, Moon Sung ^{[2
]}

Sahu, Ayaskanta ^{[1
,2
]}

Norris, David J. ^{[1
]}

Frisbie, C. Daniel ^{[2
]}

机构：

[1] Swiss Fed Inst Technol, Opt Mat Engn Lab, CH-8092 Zurich, Switzerland

[2] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 09期

基金：

美国国家科学基金会;

关键词：

PbSe nanocrystals; size-dependence; Efros-Shklovskii-variable-range-hopping; nearest-neighbor-hopping; localization length; activation energy; FIELD-EFFECT TRANSISTORS; MULTIPLE EXCITON GENERATION; QUANTUM-DOT FILMS; SEMICONDUCTOR NANOCRYSTALS; COLLOIDAL PBSE; SOLAR-CELLS; ELECTRICAL-PROPERTIES; CONDUCTIVITY; ARRAYS;

D O I：

10.1021/nl2020153

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the size- and temperature-dependence of electron transport in thin films of PbSe nanocrystals. Upon increasing temperature over the range 28-200 K, the electron transport underwent a transition in mechanism from Efros-Shklovskii-variable-range-hopping (ES-VRH) to nearest-neighbor-hopping (NNH). The transition occurred at higher temperatures for films with smaller particles. The electron localization length, estimated from the ES-VRH model, was comparable to the nanocrystal size and scaled systematically with nanocrystal diameter. The activation energy from the NNH regime was also size-dependent, which is attributed both to size-dependent Coulomb effects and the size-distribution of nanocrystals.

引用

页码：3887 / 3892

页数：6

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