Issue 10, 2022

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., 2022,15, 4157-4166

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, 15, 4157 DOI: 10.1039/D2EE01727J

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