Issue 23, 2022

Solvent annealing for morphology control to realize high efficiency all-small-molecule organic solar cells

Abstract

Morphology control of all-small-molecule (ASM) organic solar cells (OSCs) is crucial for improving their efficiencies. However, choosing an appropriate strategy for these systems is highly challenging. In this study, carbon disulfide (CS2) is demonstrated to tune morphology and synchronously enhance the power conversion efficiencies (PCEs) of BTR-Cl/Y6 based ASM-OSCs. The improved PCEs are mainly due to the with better phase separation resulting in reduced recombination, prolonged carrier lifetime, and facilitated charge extraction. Thus, compared with TA (thermal annealing) based devices, the CS2-treatment based devices exhibit better performance with FF enhanced from 65.8% to 74.2% and JSC increased from 24.23 to 24.78 mA cm−2, leading to a higher PCE of 15.5%. These findings demonstrate that the solvent (CS2) treatment can be a simple and effective way to deliver highly efficient OSCs.

Graphical abstract: Solvent annealing for morphology control to realize high efficiency all-small-molecule organic solar cells

Supplementary files

Article information

Article type
Communication
Submitted
22 sept. 2022
Accepted
25 oct. 2022
First published
04 nov. 2022

Sustainable Energy Fuels, 2022,6, 5256-5260

Solvent annealing for morphology control to realize high efficiency all-small-molecule organic solar cells

D. Hu, Q. Chen, J. Zhang and S. Lu, Sustainable Energy Fuels, 2022, 6, 5256 DOI: 10.1039/D2SE01303G

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