Document Type

Journal Article

Department/Unit

Department of Physics

Title

Contrary interfacial exciton dissociation at metal/organic interface in regular and reverse configuration organic solar cells

Language

English

Abstract

© 2014 AIP Publishing LLC. An opposite interfacial exciton dissociation behavior at the metal (Al)/organic cathode interface in regular and inverted organic solar cells (OSCs) was analyzed using transient photocurrent measurements. It is found that Al/organic contact in regular OSCs, made with the blend layer of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl]-[3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl]] (PTB7):3′H-Cyclopropa [8,25][5,6] fullerene-C70-D5h(6)-3′-butanoicacid,3′-phenyl-,methyl ester (PC70BM), always hampers the electron collection. However, this is not observed in their reverse geometry OSCs fabricated using the same PTB7:PC70BM blend system. The detrimental interfacial exciton dissociation in regular OSCs originates the compensation of field drifted photo-generated electrons at Al/organic interface. The unfavorable interfacial exciton dissociation can be eliminated, e.g., by interposing a ZnO-based interlayer between Al and organic layer, attaining an efficient electron collection, thereby power conversion efficiency.

Publication Date

2014

Source Publication Title

Applied Physics Letters

Volume

105

Issue

10

Start Page

103302

Publisher

American Institute of Physics

DOI

10.1063/1.4895675

Link to Publisher's Edition

http://dx.doi.org/10.1063/1.4895675

ISSN (print)

00036951

ISSN (electronic)

10773118

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