Fullerene bisadduct as an effective phase-separation inhibitor in preparing poly(3-hexylthiophene)–[6,6]-phenyl-C61-butyric acid methyl ester blends with highly stable morphology

Hung-Wei Liu; Deng-Yang Chang; Wen-Yen Chiu; Syang-Peng Rwei; Leeyih Wang

doi:10.1039/C2JM32444J

Fullerene bisadduct as an effective phase-separation inhibitor in preparing poly(3-hexylthiophene)–[6,6]-phenyl-C₆₁-butyric acid methyl ester blends with highly stable morphology†

Hung-Wei Liu,^a Deng-Yang Chang,^b Wen-Yen Chiu,^acd Syang-Peng Rwei^b and Leeyih Wang*^ae

Author affiliations

* Corresponding authors

^a Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan

^b Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan

^c Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan

^d Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan

^e Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
E-mail: leewang@ntu.edu.tw
Fax: +886 2 2365 5404
Tel: +886 2 3366 5276

Abstract

This work demonstrates that the bis-adduct of [6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) is an effective inhibitor of the aggregation of PCBM inside the poly(3-hexylthiophene) (P3HT) matrix. Substituting some of the PCBM with bis-PCBM apparently reduces the size of PCBM-rich clusters, enhancing both the short-circuit current density (J_SC) and the fill factor (FF), leading to a ∼17% increment in power conversion efficiency (PCE) for a cell with 8.3 wt% bis-PCBM replacement. More importantly, a tiny amount of bis-PCBM significantly improves the morphological stability of P3HT–PCBM blend against high-temperature aging. All P3HT–PCBM:bis-PCBM devices exhibit extremely stable PCEs, which do not visibly change upon heating at 150 °C for 15 hours.

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Article information

DOI: https://doi.org/10.1039/C2JM32444J
Article type: Paper
Submitted: 19 Apr 2012
Accepted: 13 Jun 2012
First published: 14 Jun 2012

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J. Mater. Chem., 2012,22, 15586-15591

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Fullerene bisadduct as an effective phase-separation inhibitor in preparing poly(3-hexylthiophene)–[6,6]-phenyl-C₆₁-butyric acid methyl ester blends with highly stable morphology

H. Liu, D. Chang, W. Chiu, S. Rwei and L. Wang, J. Mater. Chem., 2012, 22, 15586 DOI: 10.1039/C2JM32444J

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Journal of Materials Chemistry