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Issue 28, 2018
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A minimal non-radiative recombination loss for efficient non-fullerene all-small-molecule organic solar cells with a low energy loss of 0.54 eV and high open-circuit voltage of 1.15 V

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Abstract

Organic solar cells (OSCs) are considered as a promising next-generation photovoltaic technology because of their light weight, flexibility, and the potential of roll-to-roll fabrication. However, the relatively large energy loss (Eloss) from the optical bandgap (Eg) of the absorber to the open-circuit voltage (Voc) of the device hinders further improvement of the PCEs of OSCs. Here, we report efficient non-fullerene all-small-molecule organic solar cells (NF all-SMOSCs), using DR3TBDTT and O-IDTBR as the donor and acceptor, respectively. We obtain a high electroluminescence yield (EQEEL) value of up to ∼4 × 10−4 corresponding to a 0.21 eV non-radiative recombination loss, which is the smallest value for bulk-heterojunction (BHJ) OSCs so far. As a result, a low Eloss of 0.54 eV and a considerably high Voc of 1.15 V are obtained for BHJ NF all-SMOSCs.

Graphical abstract: A minimal non-radiative recombination loss for efficient non-fullerene all-small-molecule organic solar cells with a low energy loss of 0.54 eV and high open-circuit voltage of 1.15 V

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Publication details

The article was received on 19 May 2018, accepted on 27 Jun 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04665D
Citation: J. Mater. Chem. A, 2018,6, 13918-13924
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    A minimal non-radiative recombination loss for efficient non-fullerene all-small-molecule organic solar cells with a low energy loss of 0.54 eV and high open-circuit voltage of 1.15 V

    D. Yang, Y. Wang, T. Sano, F. Gao, H. Sasabe and J. Kido, J. Mater. Chem. A, 2018, 6, 13918
    DOI: 10.1039/C8TA04665D

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