π-Extension and chlorination of non-fullerene acceptors enable more readily processable and sustainable high-performance organic solar cells

doi:10.1016/j.jechem.2022.12.002

Abstract

Abstract: Organic solar cells (OSCs) processed without halogenated solvents and complex treatments are essential for future commercialization. Herein, we report three novel small molecule acceptors (NFAs) consisting of a Y6-like core but with p-extended naphthalene with progressively more chlorinated end-capping groups and a longer branched chain on the Nitrogen atom. These NFAs exhibit good solubilities in non-chlorinated organic solvents, broad optical absorptions, close p-p stacking distances (3.63-3.84 Å), and high electron mobilities (~10^-3 cm² V^-1 s^-1). The o-xylene processed and as-cast binary devices using PM6 as the donor polymer exhibit a PCE increasing upon progressive chlorination of the naphthalene end-capping group from 8.93% for YN to 14.38% for YN-Cl to 15.00% for YN-2Cl. Furthermore similarly processed ternary OSCs were fabricated by employing YN-Cl and YN-2Cl as the third component of PM6:CH1007 blends (PCE = 15.75%). Compared to all binary devices, the ternary PM6:CH1007:YN-Cl (1:1:0.2) and PM6:CH1007:YN-2Cl (1:1:0.2) cells exhibit significantly improved PCEs of 16.49% and 15.88%, respectively, which are among the highest values reported to date for non-halogenated solvent processed OSCs without using any additives and blend post-deposition treatments.

Key words: Non-fullerene acceptors, Non-chlorinated organic solvents, Organic solar cells

Ning Su, Jianhua Chen, Mengran Peng, Guoping Li, Robert M. Pankow, Ding Zheng, Junqiao Ding, Antonio Facchetti, Tobin J. Marks. π-Extension and chlorination of non-fullerene acceptors enable more readily processable and sustainable high-performance organic solar cells[J]. Journal of Energy Chemistry, 2023, 79(4): 321-329.

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URL: https://www.jenergychem.com/EN/10.1016/j.jechem.2022.12.002

https://www.jenergychem.com/EN/Y2023/V79/I4/321

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