Balance Processing and Molecular Packing via Structural Disordering in a Random Terpolymer for Over 19% Efficiency Non-Halogenated Solvent Organic Solar Cells
Journal article, 2025
Achieving commercial viability for organic solar cells (OSCs) requires non-toxic, non-halogenated solvent processing. However, poor solubility and suboptimal morphology of commonly used active layer materials have been limiting their non-halogenated solvent applications for high-performance OSCs. This study introduces a novel random terpolymer, PM7-TTz50, designed to overcome these challenges. By incorporating 50 mol% of a co-planar thiophene-thiazolothiazole (TTz) unit into the PM7 backbones, the resulting terpolymer achieves enhanced solubility in eco-friendly solvents. Furthermore, PM7-TTz50's strong aggregation tendency, coupled with high-boiling-point solvent processing—which prolongs aggregate/crystal growth—enhances molecular stacking and ordering. This approach supports efficient charge transport and minimizes non-radiative recombination, yielding power conversion efficiencies (PCEs) exceeding 19% and over 16% w/o solvent additives. Additionally, PM7-TTz50 demonstrates broad compatibility with various non-fullerene acceptors (NFAs), leading to enhanced material uniformity and reproducibility in device fabrication.
morphology
non-fullerene organic solar cells
non-halogenated solvent
random copolymerization
Author
Jingnan Wu
Sino-Danish Center for Education and Research Denmark
Shandong University
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Aalborg University
Fengbo Sun
Shandong University
Feng Hua
Shandong University
Wenwen Hou
Shandong University
Xinxin Xia
Shandong University
Xia Guo
Shandong University
Donghong Yu
Aalborg University
Sino-Danish Center for Education and Research Denmark
Ergang Wang
Chalmers, Chemistry and Chemical Engineering
Yongfang Li
Chinese Academy of Sciences
Maojie Zhang
Shandong University
Advanced Energy Materials
1614-6832 (ISSN) 1614-6840 (eISSN)
Vol. In PressSubject Categories (SSIF 2025)
Materials Chemistry
Other Chemistry Topics
Condensed Matter Physics
DOI
10.1002/aenm.202500024