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

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.

Publication Year

2016

Journal Title

Organic Electronics

Volume number

31

Publisher

Elsevier

First Page (page number)

266

Last Page (page number)

272

Referreed

1

DOI

10.1016/j.orgel.2016.01.040

ISSN (print)

15661199

Link to Publisher’s Edition

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

Keywords

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

ISSN (electronic)

18785530

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