Increasing donor-acceptor spacing for reduced voltage loss in organic solar cells

Jing Wang, Xudong Jiang, Hongbo Wu, Guitao Feng, Hanyu Wu, Junyu Li, Yuanping Yi, Xunda Feng, Zaifei Ma, Weiwei Li (), Koen Vandewal () and Zheng Tang ()
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Jing Wang: College of Materials Science and Engineering, Donghua University
Xudong Jiang: Beijing University of Chemical Technology
Hongbo Wu: College of Materials Science and Engineering, Donghua University
Guitao Feng: Beijing University of Chemical Technology
Hanyu Wu: College of Materials Science and Engineering, Donghua University
Junyu Li: DSM DMSC R&D Solutions
Yuanping Yi: Chinese Academy of Sciences
Xunda Feng: College of Materials Science and Engineering, Donghua University
Zaifei Ma: College of Materials Science and Engineering, Donghua University
Weiwei Li: Beijing University of Chemical Technology
Koen Vandewal: Instituut voor Materiaalonderzoek (IMO‐IMOMEC), Hasselt University
Zheng Tang: College of Materials Science and Engineering, Donghua University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The high voltage losses ( $${V}_{{loss}}$$ V l o s s ), originating from inevitable electron-phonon coupling in organic materials, limit the power conversion efficiency of organic solar cells to lower values than that of inorganic or perovskite solar cells. In this work, we demonstrate that this $${V}_{{loss}}$$ V l o s s can in fact be suppressed by controlling the spacing between the donor (D) and the acceptor (A) materials (DA spacing). We show that in typical organic solar cells, the DA spacing is generally too small, being the origin of the too-fast non-radiative decay of charge carriers ( $${k}_{{nr}}$$ k n r ), and it can be increased by engineering the non-conjugated groups, i.e., alkyl chain spacers in single component DA systems and side chains in high-efficiency bulk-heterojunction systems. Increasing DA spacing allows us to realize significantly reduced $${k}_{{nr}}$$ k n r and improved device voltage. This points out a new research direction for breaking the performance bottleneck of organic solar cells.

Date: 2021
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DOI: 10.1038/s41467-021-26995-1

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