Solid additive tuning of polymer blend morphology enables non-halogenated-solvent all-polymer solar cells with an efficiency of over 17%

Abstract

All-polymer solar cells (all-PSCs) have attracted considerable interest owing to their superior device stability and mechanical robustness. Recently, all-PSCs have achieved high power conversion efficiency (PCE) of over 17% benefitting from the development of polymerized small molecular acceptors. However, most all-PSCs are processed using halogenated solvents that are hazardous to the environment. Herein, non-halogenated solvent toluene is utilized with a large amount of volatilizable DTT (dithieno[3,2-b:2′,3′-d]thiophene) solid additive, for eco-friendly and highly efficient all-PSCs. The DTT solid-additive treatment can fine-tune the aggregation of the polymer donor and polymer acceptors, and the resulting active layer possesses appropriate domain size and high domain purity with bi-continuous-interpenetrating networks. Consequently, the treatment of DTT additive enables the high-performance non-halogenated solvent processed all-PSCs based on PBQ6:PYF-T-o with PCE up to 17.06% (certified PCE of 16.6%), which is among the highest efficiencies in non-halogenated-solvent-processed all-PSCs to date. Importantly, the toluene-processed active layer of all-PSCs can be successfully fabricated under ambient conditions with the help of the DTT additive, and the device fabricated under ambient conditions showed a higher PCE of 15.74%. This study highlights the importance of a solid-additive strategy in controlling the active layer morphology for practical applications of high-performance and environment-friendly all-PSCs.

Graphical abstract: Solid additive tuning of polymer blend morphology enables non-halogenated-solvent all-polymer solar cells with an efficiency of over 17%

Supplementary files

Article information

Article type
Paper
Submitted
30 May 2022
Accepted
10 Aug 2022
First published
12 Aug 2022

Energy Environ. Sci., 2022, Advance Article

Solid additive tuning of polymer blend morphology enables non-halogenated-solvent all-polymer solar cells with an efficiency of over 17%

K. Hu, C. Zhu, K. Ding, S. Qin, W. Lai, J. Du, J. Zhang, Z. Wei, X. Li, Z. Zhang, L. Meng, H. Ade and Y. Li, Energy Environ. Sci., 2022, Advance Article , DOI: 10.1039/D2EE01727J

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