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A Random Polymer Donor for High-Performance Polymer Solar Cells with Efficiency Over 14%
摘要： Constructing random copolymers has been regarded as an easy and effective approach to design polymer donors for state-of-the-art polymer solar cells (PSCs). In this work, we develop a naphtho[2,3-c]thiophene-4,9-dione (NTDO) based copolymer PBN-Cl as a donor material for PSC, and a moderate power conversion efficiency (PCE) of 11.21% is achieved with a relatively low fill factor (FF) of 0.615. We then incorporate a similar acceptor unit benzo[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) into the polymeric backbone of PBN-Cl to tune its photovoltaic performance, and a significantly higher PCE of 14.05% is achieved from the random polymer PBN-Cl-B80 containing 80% BDD unit. The enhanced PCE of the PBN-Cl-B80-based device mainly relies on the higher FF value, resulting from the improved charge mobility properties, reduced bimolecular and trap-assisted recombination, and more appropriate phase separation. The results demonstrate a feasible strategy to tune the photovoltaic performance of polymer donors by constructing random polymer with a compatible component.
关键词： polymer solar cells,power conversion efficiency,random polymer,fill factor,charge-carrier mobility,polymer donor
更新于2025-09-16 10:30:52
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A novel quinoxaline-based donor-acceptor type electrochromic polymer
摘要： We synthesize a quinoxaline-based novel conjugated donor–acceptor random copolymer containing benzodithiophene and 2,5-difluorophenylenedithiophene units as electron donors (coded r-PQ) and investigate the electrochromic properties of the material. Despite its high molecular weight, r-PQ is highly soluble in organic solvents owing to the side chain of alkoxy at the meta-position of the phenyl ring. The r-PQ film exhibits excellent redox-promoted blue to transmissive-state color switching with high coloration efficiency (>250 cm2/C) and a fast response time (< 0.5 s). These results suggest that our quinoxaline-based random copolymer could be a promising candidate as an organic electrochromic material.
关键词： donor-acceptor type,quinoxaline,random polymer,non-covalent,electrochromic
更新于2025-09-10 09:29:36