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Issue 34, 2011
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A modular molecular framework for utility in small-molecule solution-processed organic photovoltaic devices

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Abstract

We report on the design, synthesis and characterization of light harvesting small molecules for use in solution-processed small molecule bulk heterojunction (SM-BHJ) solar cell devices. These molecular materials are based upon an acceptor/donor/acceptor (A/D/A) core with donor endcapping units. Utilization of a dithieno(3,2-b;2′,3′-d)silole (DTS) donor and pyridal[2,1,3]thiadiazole (PT) acceptor leads to strong charge transfer characteristics, resulting in broad optical absorption spectra extending well beyond 700 nm. SM-BHJ solar cell devices fabricated with the specific example 5,5′-bis{7-(4-(5-hexylthiophen-2-yl)thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-c]pyridine}-3,3′-di-2-ethylhexylsilylene-2,2′-bithiophene (6) as the donor and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor component showed short circuit currents above −10 mA cm−2 and power conversion efficiencies (PCEs) over 3%. Thermal processing is a critical factor in obtaining favorable active layer morphologies and high PCE values. A combination of UV-visible spectroscopy, conductive and photo-conductive atomic force microscopies, dynamic secondary mass ion spectrometry (DSIMS), and grazing incident wide angle X-ray scattering (GIWAXS) experiments were carried out to characterize how thermal treatment influences the active layer structure and organization.

Graphical abstract: A modular molecular framework for utility in small-molecule solution-processed organic photovoltaic devices

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Publication details

The article was received on 04 May 2011, accepted on 16 Jun 2011 and first published on 22 Jul 2011


Article type: Paper
DOI: 10.1039/C1JM11963J
Citation: J. Mater. Chem., 2011,21, 12700-12709
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    A modular molecular framework for utility in small-molecule solution-processed organic photovoltaic devices

    G. C. Welch, L. A. Perez, C. V. Hoven, Y. Zhang, X. Dang, A. Sharenko, M. F. Toney, E. J. Kramer, T. Nguyen and G. C. Bazan, J. Mater. Chem., 2011, 21, 12700
    DOI: 10.1039/C1JM11963J

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