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Issue 65, 2016
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Porphyrin dimers as donors for solution-processed bulk heterojunction organic solar cells

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Abstract

We synthesize a novel class of porphyrin dimers consisting of two zinc-metalated porphyrin units covalently linked through ethynyl (KC1) or butadiyne (KC2) group as electron donors blended with [6,6]-phenyl C70 butyric acid methyl ester (PC70BM) as electron acceptor for the fabrication of organic bulk heterojunction (BHJ) solar cells. The solution processed BHJ solar cells with porphyrin dimers:PC70BM show superior performance than those based on their parent monomer due to much broader light absorption spectra. It is found that devices with KC2 : PC70BM blend in the weight ratio of 1 : 4 exhibit higher power conversion efficiency (PCE) over those with KC1:PC70BM blend. When the KC2:PC70BM blend is processed from solvent containing 3% v/v 1-chloronaphathalene (CN), the PCE of the solar cell is improved to 2.03% from 1.73%. The superior performance and the performance improvement of the solar cells with KC2:PC70BM are due to the high short circuit current density (Jsc) resulting from a higher effective device mobility and a lower series resistance. The study provides a useful guideline for designing porphyrin based donor materials for optoelectronic device application.

Graphical abstract: Porphyrin dimers as donors for solution-processed bulk heterojunction organic solar cells

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Publication details

The article was received on 23 Feb 2016, accepted on 15 Jun 2016 and first published on 16 Jun 2016


Article type: Paper
DOI: 10.1039/C6RA04746G
Citation: RSC Adv., 2016,6, 60626-60632
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    Porphyrin dimers as donors for solution-processed bulk heterojunction organic solar cells

    F. Hsu, M. Hsieh, C. Kashi, C. Yeh, T. Lin and Y. Chen, RSC Adv., 2016, 6, 60626
    DOI: 10.1039/C6RA04746G

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