Document Type

Journal Article

Department/Unit

Department of Physics; Institute of Advanced Material

Language

English

Abstract

Fullerene-based bulk heterojunction organic solar cells (BHJ-OSCs) represent one of the current state-of-the-art organic solar cells. Nonetheless, most of these devices still suffer from adverse performance degradation due to thermally induced morphology changes of active layers. We herein demonstrate that the photovoltaic performance stability of BHJ-OSCs can be profoundly enhanced with an appositely functionalized 9-fluorenylidene malononitrile. The latter, through charge transfer (CT) interactions with a donor polymer, enables the formation of a “frozen” 3-dimensional mesh-like donor polymer matrix, which effectively restrains free movement of embedded fullerene molecules and suppresses their otherwise uncontrolled aggregation. 9-Fluorenylidene malononitrile derivatives with multiple CT interaction sites are particularly effective as preservation of a power conversion efficiency of over 90% under severe thermal stress has been accomplished. The generality of this novel strategy has been affirmed with several common donor polymers, manifesting it to be hitherto the most efficient approach to stabilized fullerene-based BHJ-OSCs.

Publication Date

12-2017

Source Publication Title

Journal of Materials Chemistry A

Volume

5

Issue

45

Start Page

23662

End Page

23670

Publisher

Royal Society of Chemistry

Peer Reviewed

1

Copyright

This journal is © The Royal Society of Chemistry 2017

Funder

This work was financially supported by a Strategic Development Fund (SDF13-0531-A02) and a Research Committee grant (RC-ICRS/15-16/4A-SSK) of Hong Kong Baptist University, a CRF (C5015-15GF) and GRF grants (HKBU211913) from Hong Kong Research Grants Council, a Shenzhen Science and Technology Innovation Grant (KQTD20140630110339343), and Hung Hin Shiu Charitable Foundation.

DOI

10.1039/C7TA06530B

Link to Publisher's Edition

http://dx.doi.org/10.1039/C7TA06530B

ISSN (print)

20507488

ISSN (electronic)

20507496

JA-4862-29440_suppl.pdf (3970 kB)
Supplementary information

Available for download on Tuesday, January 01, 2019

Additional Files

JA-4862-29440_suppl.pdf (3970 kB)
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