High efficiency photodetectors fabricated by electrostatic layer-by-layer self-assembly of CdTe quantum dots

被引：29

作者：

Tu, Chang-Ching ^{[1
]}

Lin, Lih Y. ^{[1
]}

机构：

[1] Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.3003883

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate high-performance photodetectors from multilayers of CdTe quantum dots (QDs). The QDs are synthesized and dispersed in aqueous solution with either 2-mercaptoethylamine (positively charged) or thioglycolic acid (negatively charged) as capping stabilizers. By electrostatic attraction, the charged QDs are self-assembled layer by layer on an indium tin oxide substrate modified with (3-aminopropyl)triethoxysilane. This process allows control of active layer thickness by self-assembly, and can in principle be applied to a wide range of substrates. The photodetector exhibits high responsivity (0.18 A/W) under 0.1 V bias due to extremely short capping ligands of QDs, which have high internal quantum efficiency, and the densely packed multilayer structure. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3003883]

引用

页数：3

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