Issue 28, 2010

Enhanced device performance of organic solar cellsviareduction of the crystallinity in the donor polymer

Abstract

A new π-conjugated polymer, poly(2,5-dioctyloxyphenylene vinylene-alt-3,3-dioctylquater thiophene) (PPVQT-C8), consisting of alternating p-divinylene phenylene and 3,3-dialkylquater thiophene units, was synthesized for use in organic solar cell devices. The crystallinity of poly(quaterthiophenes) (PQTs) was reduced by introducing p-divinylene phenylene units between pairs of quaterthiophene units. A well-mixed nanoscale morphology of PPVQT-C8:PCBM photoactive layer resulted from this modification, which increased the power conversion efficiency relative to devices based on highly crystalline PQTs. Bulk heterojunction solar cells based on PPVQT-C8:PC60BM blends with a 1 : 3 ratio presented the best photovoltaic performances, with a short-circuit current density (Jsc) of 6.7 mA cm−2, an open-circuit voltage (Voc) of 0.67 V, a fill factor (FF) of 0.62 and a power conversion efficiency (PCE) of 2.8% under illumination of AM 1.5 with light intensity of 100 mW cm−2. The charge carrier mobility and morphology studies indicated that an optimized interpenetration network composed of PPVQT-C8: PCBM could be achieved in a blend ratio of 1 : 3.

Graphical abstract: Enhanced device performance of organic solar cells via reduction of the crystallinity in the donor polymer

Supplementary files

Article information

Article type
Paper
Submitted
11 Mar 2010
Accepted
15 Apr 2010
First published
10 Jun 2010

J. Mater. Chem., 2010,20, 5860-5865

Enhanced device performance of organic solar cells via reduction of the crystallinity in the donor polymer

J. H. Park, J. Park, D. H. Kim, J. Kim, J. S. Kim, J. H. Lee, M. Sim, S. Y. Lee and K. Cho, J. Mater. Chem., 2010, 20, 5860 DOI: 10.1039/C0JM00664E

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