Document Type

Journal Article

Department/Unit

Department of Physics

Title

An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives

Language

English

Abstract

A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on 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): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.

Keywords

Transient photocurrent, Oxide/organic hetero-interface, Charge collection efficiency, Interfacial exciton dissociation, Absorption enhancement

Publication Date

4-30-2016

Source Publication Title

Organic Electronics

Volume

31

Start Page

266

End Page

272

Publisher

Elsevier

Peer Reviewed

1

DOI

10.1016/j.orgel.2016.01.040

Link to Publisher's Edition

http://dx.doi.org/10.1016/j.orgel.2016.01.040

ISSN (print)

15661199

ISSN (electronic)

18785530

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