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Issue 4, 2020
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Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends

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Abstract

The efficiency of organic solar cells with donor polymers and non-fullerene acceptors depends on a complex morphology. Similar chemical and electronic structures impede generating in-depth insights in morphological details. We visualise molecular arrangements and the nanomorphology in PBDB-T:ITIC blends by correlating transmission electron micrographs and material distribution maps. Material phases are identified by machine learning on hyperspectral data from electron spectroscopic imaging. We observe a specific polymorph of ITIC after thermal annealing. During annealing, enhanced by the presence of additives, PBDB-T acts as nucleation site for ITIC due to strong π–π-interactions of the electron withdrawing groups of both molecules. This leads to efficient charge transport paths in ITIC phases with direct π–π-contact to PBDB-T at the interface. We conclude that π–π-stacking between donor and acceptor molecules facilitates charge carrier generation within mixed interface regions.

Graphical abstract: Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends

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Supplementary files

Article information


Submitted
01 Nov 2019
Accepted
20 Feb 2020
First published
21 Feb 2020

This article is Open Access

Energy Environ. Sci., 2020,13, 1259-1268
Article type
Paper

Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends

W. Köntges, P. Perkhun, J. Kammerer, R. Alkarsifi, U. Würfel, O. Margeat, C. Videlot-Ackermann, J. Simon, R. R. Schröder, J. Ackermann and M. Pfannmöller, Energy Environ. Sci., 2020, 13, 1259
DOI: 10.1039/C9EE03535D

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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