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Increase in efficiency on using selenophene instead of thiophene in π-bridges for D-π-DPP-π-D organic solar cells

Abstract

A new D-π-A-π-D small molecule (VC7) based on a selenophene-flanked diketopyrrolopyrrole core and two Zn-porphyrin peripheral moieties was designed and synthesized. The optical and electrochemical properties of VC7 were investigated and compared with those of VC6, which has the same chemical structure but with thiophene units in the π-bridge rather than selenophene. VC7 exhibited extended absorption spectra in the near infrared region of the solar spectrum and showed improved hole mobility with a high HOMO energy level. After optimization of the active layers, VC7:PC71BM organic solar cells (OSCs) showed a significantly higher power conversion efficiency of 9.24% (JSC = 15.98 mA/cm2, VOC = 0.89 V and FF = 0.66) in comparison to VC6:PC71BM (PCE of 7.27%, JSC = 14.31 mA/cm2, VOC = 0.82 V and FF = 0.62); this result represents a 27% increase in efficiency. The higher JSC value for the VC7-based OSC is attributed to the extended absorption profile and higher hole mobility, more balanced charge transport and high exciton dissociation probability.

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Publication details

The article was received on 05 Mar 2019, accepted on 15 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02415H
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Increase in efficiency on using selenophene instead of thiophene in π-bridges for D-π-DPP-π-D organic solar cells

    F. Langa, V. Cuesta, M. Vartanian, P. Malhotra, S. Biswas, P. de la Cruz and G. D. Sharma, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02415H

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