Optical limitations in thin-film low-band-gap polymer/fullerene bulk heterojunction devices

被引：14

作者：

Persson, Nils-Krister ^{[1
]}

Wang, Xiangjun

Inganas, Olle

机构：

[1] Linkoping Univ, IFM, SE-58183 Linkoping, Sweden

[2] Linkoping Univ, Ctr Organ Elect, SE-58183 Linkoping, Sweden

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 08期

关键词：

D O I：

10.1063/1.2736280

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Photovoltaic devices from the low-band-gap alternating copolymer APFO-Green1, blended with the fullerene derivative BTPF70 as electron acceptor, show a pronounced variation of the external quantum efficiency with varying thickness. Device simulation, based on ellipsometric characterization, reveals that this behavior is to be expected and valid also for most low-band-gap polymers and that it can be explained by optical interference. Requirements for materials suitable for wide spectral coverage in thin-film organic solar cells are delineated. Furthermore, the internal quantum efficiency is calculated to be approximate to 0.4. (C) 2007 American Institute of Physics.

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