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Optimized Molecular Packing and Nonradiative Energy Loss Based on Terpolymer Methodology Combining Two Asymmetric Segments for High-Performance Polymer Solar Cells
摘要： In this work, a random terpolymer methodology combining two electron-rich units, asymmetric thienobenzodithiophene (TBD) and thieno[2,3-f]benzofuran (TBF) segments, is systematically investigated. The synergetic effect is embodied on the molecular packing and nanophase when copolymerization with 1,3-bis(2-ethylhexyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD), producing an impressive power conversion efficiency (PCE) of 14.2% in IT-4F based NF-PSCs, which outperformed the corresponding D-A copolymers. The balanced aggregation and better interpenetrating network of the TBD50:IT-4F blend film can lead to mixing region exciton splitting and suppress carrier recombination, along with high yields of long-lived carriers. Moreover, the broad applicability of terpolymer methodology is successfully validated in most electron-deficient systems. Especially, TBD50/Y6-based device exhibits high PCE of 15.0% with a small energy loss (0.52 eV) enabled by the low non-radiative energy loss (0.22 eV), which are among the best values reported for polymers without using BDT unit to date. These results demonstrate an outstanding terpolymer approach with backbone engineering to raise the hope of achieving even higher PCEs and to enrich organic photovoltaic materials reservoir.
关键词： asymmetrical structure,microstructure,random terpolymer,nonfullerene solar cell,non-radiative energy loss,power conversion efficiency
更新于2025-09-23 15:19:57
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Largely improved bulk-heterojunction morphology in organic solar cells based on a conjugated terpolymer donor via a ternary strategy
摘要： In this wok, a D1-A-D2-A random terpolymer donor PFBT4T-BDT10 was synthesized for application in organic solar cells (OSCs). With fullerene derivative PC71BM as the acceptor, the PFBT4T-BDT10:PC71BM binary active layer delivered a very low short-circuit current (Jsc) of 5.87 mA cm?2 and a low fill factor (FF) of 53.8%, leading to a poor efficiency of 2.40%. With a small fused ring electron acceptor IDIC as the third component, the PFBT4T-BDT10:IDIC:PC71BM ternary active layers displayed a largely elevated efficiency up to 10.17%, corresponding to significantly elevated Jsc of 21.12 mA cm?2 and FF of 63.9%. The favorable morphology and the broader absorption are the main reasons for the elevation of Jsc. It was found that IDIC could act as a morphology regulator in the ternary blends, not only restricting the aggregation of PC71BM but also maintaining the crystallization of PFBT4T-BDT10. Our work highlights the importance of ternary blend strategy for random terpolymers.
关键词： Organic solar cells,Ternary blends,Random terpolymer
更新于2025-09-12 10:27:22