Thin film photodiodes fabricated by electrostatic self-assembly of aqueous colloidal quantum dots

被引：5
作者：
Tu, Chang-Ching [1 ]
Lin, Lih Y. [1 ]
机构：
[1] Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA
来源：
THIN SOLID FILMS | 2010年 / 519卷 / 02期
基金：
美国国家科学基金会;
关键词：
Photovoltaic cells; Photodetectors; Quantum dots; Cadmium telluride; NANOCRYSTALS; PHOTOVOLTAICS; NANOPARTICLES; SILICON;
D O I：
10.1016/j.tsf.2010.08.141
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate a thin film photodiode structure consisting of multi layers of colloidal quantum dots (QDs) which has application in photovoltaics and photodetection The CdTe QDs with either positively or negatively charged capping ligands are self-assembled layer-by-layer on an indium tin oxide (ITO) substrate by electrostatic attraction in aqueous solution A photolithographically patterned photoresist window defines the device active area and an evaporated aluminum (Al) thin film serves as the top electrode The built-In electric field due to the work function difference between Al and ITO separates photo excited electron-hole pairs and generates photocurrent Since the ligands used for QD synthesis are short (less than 05 rim) no additional steps of ligand exchange or annealing is needed for enhancing the thin film photoconductivity Thiol passivation and self-assembly in an inert environment help reduce surface traps leading to less fermi-level pinning which also Improves the device performance (C) 2010 Elsevier B V All rights reserved
引用
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页码：857 / 862
页数：6
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