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

• Published in: Energy & environmental science Vol. 15; no. 1; pp. 4157 - 4166
• Main Authors: Hu, Ke, Zhu, Can, Ding, Kan, Qin, Shucheng, Lai, Wenbin, Du, Jiaqi, Zhang, Jianqi, Wei, Zhixiang, Li, Xiaojun, Zhang, Zhanjun, Meng, Lei, Ade, Harald, Li, Yongfang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 12.10.2022
• Subjects: Active control; Chemistry; Cytology; Dithiothreitol; Domains; Energy & Fuels; Energy conversion efficiency; Engineering; Environmental Sciences & Ecology; Hazardous areas; Interpenetrating networks; Morphology; Photovoltaic cells; Polymer blends; Polymers; Solar cells; Solvents; Toluene
• ISSN: 1754-5692; 1754-5706
• DOI: 10.1039/d2ee01727j

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. The treatment of toluene solvent and DTT additive enables the PBQ6:PYF-T- o -based all-PSC devices with PCE up to 17.06%, which is one of the highest value in non-halogenated-processed all-PSCs to date.