Lateral organic bilayer heterojunction photoconductors

被引：21

作者：

Ho, John C. ^{[1
]}

Arango, Alexi ^{[1
]}

Bulovic, Vladimir ^{[1
]}

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 06期

基金：

美国国家科学基金会;

关键词：

Chemical signals - Conversion gain - Electrical response - External quantum efficiency - Internal quantum efficiency - Organic bilayers - Top surface - Two terminals;

D O I：

10.1063/1.2949317

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate a two-terminal, lateral organic bilayer photoconductor that generates an external quantum efficiency of (12 +/- 1)%, with an internal quantum efficiency of (140 +/- 2)% indicative of photon-to-electron conversion gain. The photoconductor incorporates a heterojunction between N,N'-bis(3-methylphenyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (TPD) and 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI). Excitons generated with photoexcitation of PTCBI dissociate at the PTCBI/TPD interface and raise the charge carrier concentration in TPD, increasing device conductance. The exposed top surface enables interaction with chemical analytes in the environment, motivating the use of the photoconductor as a chemical sensor that transduces chemical signals into amplified changes in the electrical response. (C) 2008 American Institute of Physics.

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