Efficient polymer-nanocrystal quantum-dot photodetectors

被引：145

作者：

Qi, DF

Fischbein, M

Drndic, M

Selmic, S ^{[1
]}

机构：

[1] Louisiana Tech Univ, Dept Elect Engn, Ruston, LA 71272 USA

[2] Louisiana Tech Univ, Inst Micromfg, Ruston, LA 71272 USA

[3] Univ Penn, Dept Phys & Astron, David Rittenhouse Lab, Philadelphia, PA 19104 USA

来源：

APPLIED PHYSICS LETTERS | 2005年 / 86卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.1872216

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have realized highly efficient photodetectors based on composites of the semiconducting polymer poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] and PbSe nanocrystal quantum dots. The external quantum efficiency in these devices is greater than 1 for electric fields E similar to 7 X 10(5) V/cm. The observed photocurrent gain could be attributed to the carrier multiplication in PbSe nanocrystal quantum dots via multiple exciton generation, and the efficient charge conduction through the host polymer material. This photocurrent gain is observed only when the PbSe nanocrystal band gap is at least three times smaller than the optical energy gap of the active polymer material. (C) 2005 American Institute of Physics.

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页码：1 / 3

页数：3

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