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Effect of polymer donor aggregation on the active layer morphology of amorphous polymer acceptor-based all-polymer solar cells

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Abstract

Most of the polymer acceptors for all-polymer solar cells (all-PSCs) are semi-crystalline. Amorphous polymer acceptors containing B ← N units represent a new class of acceptor materials and possess unique phase separation behaviours in all-PSCs. In this work, to study their phase separation morphology and all-PSC device performance, we select three polymer donors with an identical polymer backbone but different side chains to blend with an amorphous polymer acceptor (rr-PBN). Among the three polymer donors, J91 exhibits the strongest aggregation tendency in solution and moderate crystallinity in thin film. The J91:rr-PBN blend shows the most optimal phase separation morphology and the best all-PSC device performance. In comparison, J51 shows the least aggregation tendency in solution and the highest crystallinity in thin film. The all-PSC device of the J51:rr-PBN blend exhibits sub-optimal active layer morphology and poor photovoltaic performance. These results indicate that the aggregation tendency in solution of polymer donors is the dominant factor in the phase separation of semi-crystalline polymer donor/amorphous polymer acceptor blends in all-PSCs.

Graphical abstract: Effect of polymer donor aggregation on the active layer morphology of amorphous polymer acceptor-based all-polymer solar cells

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Article information


Submitted
05 Dec 2019
Accepted
11 Mar 2020
First published
12 Mar 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Effect of polymer donor aggregation on the active layer morphology of amorphous polymer acceptor-based all-polymer solar cells

L. Zhang, Z. Ding, R. Zhao, F. Jirui, W. Ma, J. Liu and L. Wang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06668C

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