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- Title
Side‐Chain Substituents on Benzotriazole‐Based Polymer Acceptors Affecting the Performance of All‐Polymer Solar Cells.
- Authors
Fu, Huiting; Li, Yuxiang; Wu, Ziang; Lin, Francis R.; Woo, Han Young; Jen, Alex K.‐Y.
- Abstract
Recently, the strategy of polymerized small‐molecule acceptors (PSMAs) has attracted extensive attention for applications in all‐polymer solar cells (all‐PSCs). Although side‐chain engineering is considered as a simple and effective strategy for manipulating polymer properties, the corresponding effect on photovoltaic performance of PSMAs in all‐PSCs has not been systemically investigated. Herein, a series of PSMAs based on the benzotriazole (BTz)‐core fused SMAs with different N‐alkyl chains including branched 2‐butyloctyl, linear n‐octyl, and methyl on the BTz unit, namely PZT‐C12, PZT‐C8, and PZT‐C1, respectively, is presented. Comparative studies show that the size of alkyl chains has a significant impact on the solid‐state behavior of PZT polymers, which in turn affects their light absorption and charge transporting capacities, and subsequently the all‐PSC performances. When combining with the polymer donor PBDB‐T, PZT‐C1 affords a champion power conversion efficiency of 14.9%, compared to 13.1% of PZT‐C12, and 13.8% of PZT‐C8 in the resultant all‐PSCs, mainly benefiting from its better crystallinity and the more favorable blend morphology. This work emphasizes the importance of optimizing side‐chain substituents on PSMAs for improving the device efficiency of all‐PSCs.
- Subjects
SOLAR cells; PHOTOVOLTAIC power systems; PHOTOVOLTAIC effect; POLYMERS; LIGHT absorption; BENZOTRIAZOLE derivatives; BENZOTRIAZOLE
- Publication
Macromolecular Rapid Communications, 2022, Vol 43, Issue 16, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.202200062