Developing Benzodithiophene-Free donor polymer for 19.36% efficiency Green-Solvent-Processable organic solar cells

He, Ying; Jing, Wenwen; Liao, Chentong; Xu, Xiaopeng; Duan, Yuwei; Li, Ruipeng; Yu, Liyang; Peng, Qiang

doi:10.1016/j.cej.2024.151920

Developing Benzodithiophene-Free donor polymer for 19.36% efficiency Green-Solvent-Processable organic solar cells

Journal Article · Sat May 04 00:00:00 EDT 2024 · Chemical Engineering Journal

DOI:https://doi.org/10.1016/j.cej.2024.151920· OSTI ID:2440571

He, Ying ^[1]; Jing, Wenwen ^[1]; Liao, Chentong ^[1]; Xu, Xiaopeng ^[1]; Duan, Yuwei ^[2]; Li, Ruipeng ^[3]; ^[1]; ^[1]

Sichuan Univ., Chengdu (China)
Chengdu University of Technology (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Here, in this work, a newly benzodithiophene-free D-A polymer donor, named PDTP-BDD, was developed for realizing green-solvent processed high-performance OSCs. By bridging two electron-rich unit of dithieno[3,2-b:2',3'-d]pyridin-5(4H)-one (DTP) and electron-deficient benzo[1,2-c:4,5c']dithiophene-4,8-dione (BDD) with thiophene units, PDTP-BDD possesses high absorption in the short wavelength range and a deep HOMO energy level. The rigid building blocks also make PDTP-BDD has strong aggregation and poor solubility in common halogen-free solvents (such as o-xylene) at room temperature, but it is readily dissolved and disaggregated at high temperature (120 °C). After cooling down to a lower temperature (60 °C), PDTP-BDD self-assembled and pre-aggregated slowly in the solution at a long time. By employing a delayed processing strategy in the layer-by-layer processed OSCs (LbL-OSCs), an optimized fibril network of the underling layer was realized, enabling the permeation of acceptor into the donor network. The optimized PDTP-BDD/L8-BO-based LbL-OSCs realized a high PCE of 18.42 %. By adding a small amount of D18 to further optimize the PDTP-BDD fibril network, an impressive PCE of 19.36 % was achieved finally in the resulting ternary LbL-OSCs, which is the highest value for OSCs processed by halogen-free solvents.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2440571

Report Number(s):: BNL--226014-2024-JAAM

Journal Information:: Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 490; ISSN 1385-8947

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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