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Energy-level modulation of non-fullerene acceptors to achieve high-efficiency polymer solar cells at diminished energy offset

Abstract

Efficient fullerene-free polymer solar cells (PSCs) are fabricated with a polymer donor PBDB-T1 and a non-fullerene acceptor ITTIC. With the incorporation of one thiophene bridge between the indacenodithienothiophene (IDTT) core and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) terminal, the new acceptor ITTIC exhibits a higher lying lowest unoccupied molecular orbital (LUMO), and a narrower bandgap than the pristine ITIC acceptor. The resultant PSCs with PBDB-T1:ITTIC blends exhibit a power conversion efficiency of 9.12%, with an increased open circuit voltage (VOC) and broader photoresponse, comparing with the PBDB-T1:ITIC based devices. Interestingly, it shows that the charge transfer remains effective at a diminished the highest occupied molecular orbital (HOMO) difference of 0.02 eV between PBDB-T1 and ITTIC, leading to a mitigated energy loss of 0.54 eV in PBDB-T1:ITTIC based devices. Overall, this work provides new insights into further improvement of fullerene-free PSCs.

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Publication details

The article was received on 20 Feb 2017, accepted on 12 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01554B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Energy-level modulation of non-fullerene acceptors to achieve high-efficiency polymer solar cells at diminished energy offset

    Z. Zhang, W. Liu, T. Rehman, H. Ju, J. Mai, X. Lu, M. Shi, J. Zhu, C. Li and H. Chen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01554B

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