Charge carrier mobility and lifetime of organic bulk heterojunctions analyzed by impedance spectroscopy

被引：526

作者：

Garcia-Belmonte, Germa ^{[1
]}

Munar, Antoni ^{[1
]}

Barea, Eva M. ^{[1
]}

Bisquert, Juan ^{[1
]}

Ugarte, Irati ^{[2
]}

Pacios, Roberto ^{[2
]}

机构：

[1] Univ Jaume 1, Dept Fis, Castellon de La Plana 12071, Spain

[2] IKERLAN IK4 S Coop, Dept Microsyst, Arrasate Mondragon 20500, Gipuzkoa, Spain

来源：

ORGANIC ELECTRONICS | 2008年 / 9卷 / 05期

关键词：

P3HT : PCBM heterojunctions; organic solar cells; capacitance; impedance spectroscopy; mobility lifetime;

D O I：

10.1016/j.orgel.2008.06.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Charge carrier diffusion and recombination in an absorber blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C-61-butyric acid methyl ester (PCBM) with indium tin oxide (ITO) and aluminium contacts have been analyzed in the dark by means of impedance spectroscopy. Reverse bias capacitance exhibits Mott-Schottky-like behavior indicating the formation of a Schottky junction (band bending) at the P3H:PCBM-Al contact. Impedance measurements show that minority carrier (electrons) diffuse out of the P3HT:PCBM-Al depletion zone and their accumulation contributes to the capacitive response at forward bias. A diffusion-recombination impedance model accounting for the mobility and lifetime parameters is outlined. Electron mobility results to be 2 x 10(-3) cm(2) V-1 s(-1) and lifetime lies within the milliseconds timescale. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：847 / 851

页数：5

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