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Issue 38, 2014
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High efficiency solution-processed two-dimensional small molecule organic solar cells obtained via low-temperature thermal annealing

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Abstract

A new two-dimensional (2D) organic small molecule, DCA3T(T-BDT), was designed and synthesized for solution-processed organic solar cells (OSCs). DCA3T(T-BDT) exhibited a deep HOMO energy level (−5.37 eV) and good thermal stability. The morphologies of the DCA3T(T-BDT):[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) blends were investigated by atomic force microscopy and the crystallinity was explored by X-ray diffraction (XRD) and 2D grazing incidence wide-angle X-ray scattering (GIWAXS), respectively. The morphologies of the blends were strongly influenced by the blend ratio of DCA3T(T-BDT):PC61BM and annealing temperature. The effect of thermal annealing on the photovoltaic performance of DCA3T(T-BDT)-based small molecule organic solar cells (SMOSCs) was studied in detail. When DCA3T(T-BDT) was used as a donor with PC61BM as an acceptor, high efficiency SMOSCs with a power conversion efficiency of 7.93%, a high Voc of 0.95 V, Jsc of 11.86 mA cm−2 and FF of 0.70 were obtained by a thermal annealing process at only 60 °C, which offers obvious advantages for large scale production compared with solvent additive or interfacial modification treatment.

Graphical abstract: High efficiency solution-processed two-dimensional small molecule organic solar cells obtained via low-temperature thermal annealing

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Publication details

The article was received on 29 Jun 2014, accepted on 28 Jul 2014 and first published on 19 Aug 2014


Article type: Paper
DOI: 10.1039/C4TA03314K
J. Mater. Chem. A, 2014,2, 15904-15911

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    High efficiency solution-processed two-dimensional small molecule organic solar cells obtained via low-temperature thermal annealing

    Z. Du, W. Chen, Y. Chen, S. Qiao, X. Bao, S. Wen, M. Sun, L. Han and R. Yang, J. Mater. Chem. A, 2014, 2, 15904
    DOI: 10.1039/C4TA03314K

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