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Issue 1, 2020
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Efficient as-cast thick film small-molecule organic solar cell with less fluorination on the donor

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Abstract

Herein, two donor materials based on fluorine substituted isatin units (DI3T-1F, DI3T-2F) were designed and synthesized for thick-film small molecule solar cells. The devices based on DI3T-1F demonstrate balanced charge transport and less trap-assisted recombination, leading to higher power conversion efficiency (PCE) of 8.33% with a thickness ca. 150 nm compared to DI3F-2F (PCE of 7.32% with thick film at ca. 160 nm) without additives, solvent or thermal annealing treatments. More interestingly, the device based on DI3T-1F small molecules demonstrates good tolerance to active layer thickness from 150 to 300 nm with device performance over 5%. Our results indicate that less fluorine atoms on the donor units can optimize the charge transport, and phase-segregated morphology in small molecule solar cells without the need for post-treatment.

Graphical abstract: Efficient as-cast thick film small-molecule organic solar cell with less fluorination on the donor

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Article information


Submitted
01 Oct 2019
Accepted
08 Nov 2019
First published
14 Nov 2019

Mater. Chem. Front., 2020,4, 206-212
Article type
Research Article

Efficient as-cast thick film small-molecule organic solar cell with less fluorination on the donor

K. Wang, X. Song, X. Guo, Y. Wang, X. Lai, F. Meng, M. Du, D. Fan, R. Zhang, G. Li, A. K. K. Kyaw, J. Wang, W. Huang and D. Baran, Mater. Chem. Front., 2020, 4, 206
DOI: 10.1039/C9QM00605B

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