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Doping porphyrin-based bulk heterojunction solar cells with LITFSI and TFSA

Abstract

Strong electron-withdrawing materials of bis(trifluoromethanesulfonyl)amide (TFSA, [CF3SO2]2NH) and bis(trifluoromethane)sulfonimide lithium salt (LiTFSI, [CF3SO2]2NLi) are incorporated into the active layers of a porphyrin small molecule TDPPEZnP and PC61BM for bulkheterojunction solar cells. While the solar cells based on the undoped devices show a power conversion efficiency (PCE) of 6.11% with a Voc of 0.70 V, a Jsc of 13.92 mA cm-2 and a FF of 62.71%, doping the active layer with very low loadings of LITFSI and TFSA leads to improved PCEs of 6.85% and 7.01% with Jsc values of 14.97 and 15.39 mA cm-2 and FF values of 64.73% and 63.92%, accounting for 14% and 16% PCE enhancement, respectively. The improved performance is ascribed to the enhanced charge carrier transport, which are supported by charge mobility, Impedance spectroscopy and transient spectroscopy analyses.

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Publication details

The article was received on 01 Jun 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC02416A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Doping porphyrin-based bulk heterojunction solar cells with LITFSI and TFSA

    X. Chen, T. Liang, K. Gao, X. Peng and Y. Cao, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02416A

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