Axisymmetric and Asymmetric Naphthalene-Bisthienothiophene Based Nonfullerene Acceptors: On Constitutional Isomerization and Photovoltaic Performance

Hu W, Du X, Zhuang W, Su W, Cao J, Pourrahimi AM, Li N, Shen X, Zhang M, Yu D, Gruber W, Unruh T, Wang E, Brabec C (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 3

Pages Range: 5734-5744

Issue: 6

DOI: 10.1021/acsaem.0c00689

Abstract

Two pairs of constitutional isomers of fused-octacyclic nonfullerene acceptors (NFAs) based on a naphthalene-bisthienothiophene core with or without fluorination at the ending groups have been developed. Compared with the axisymmetric NFAs N66-IC and N66-2FIC with two six-member-ring bridges, their asymmetric constitutional isomers N65-IC and N65-2FIC both with one six-member-ring bridge and one five-member-ring bridge exhibit remarkable red-shifted absorption, higher crystallinity, and slightly down-shifted LUMO energy levels. Organic solar cells based on PBDB-T-2F:N65-2FIC achieved a promising power conversion efficiency of 10.19%, which is three times higher than that of its counterpart PBDB-T-2F:N66-2FIC cell (3.46%). While being blended with PBDB-T as the donor material, the asymmetric acceptor analogue N65-IC based solar cell pronounces a PCE of 9.03%, being significantly improved from that of 5.45% for the PBDB-T:N66-IC based cell, which is in consistency with the results from those cells from their both fluorinated donor and acceptor counterparts. Design rules on either both fluorinated, both nonfluorinated, or cross-combined donor/acceptors for device fabrication has been explored. In addition, PBDB-T-2F:N65-2FIC possesses very promising device stability with 85% of its initial PCE after an exposure time of 1500 h under one sun illumination, which is meaningful for their future commercial devices.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Chalmers University of Technology / Chalmers tekniska högskola Sweden (SE) Hebei Normal University of Science and Technology China (CN) Hunan University of Science and Technology China (CN) Soochow University, Suzhou / 苏州大学 China (CN) Aalborg University Denmark (DK)

How to cite

APA:

Hu, W., Du, X., Zhuang, W., Su, W., Cao, J., Pourrahimi, A.M.,... Brabec, C. (2020). Axisymmetric and Asymmetric Naphthalene-Bisthienothiophene Based Nonfullerene Acceptors: On Constitutional Isomerization and Photovoltaic Performance. ACS Applied Energy Materials, 3, 5734-5744. https://dx.doi.org/10.1021/acsaem.0c00689

MLA:

Hu, Wei, et al. "Axisymmetric and Asymmetric Naphthalene-Bisthienothiophene Based Nonfullerene Acceptors: On Constitutional Isomerization and Photovoltaic Performance." ACS Applied Energy Materials 3 (2020): 5734-5744.

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