期刊
ACS OMEGA
卷 4, 期 21, 页码 19177-19182出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b02476
关键词
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资金
- China Scholarship Council Scholarship fund [CSC201508410221]
- National Natural Science Foundation Project of China [11804084]
- Advanced Technology Research Program of Henan Province [182102210369]
- Foundation for Key Program of Education Department of Henan Province [19A140011, 20A140017]
This work investigates the photovoltaic properties of polymers that include different carbazole blocks as electron donors (D) but the same benzothiadiazole derivative as the electron acceptor (A). Five D-A copolymers are studied with ultrafast intramolecular exciton splitting and recombination dynamics to acquire the single-molecule structure and their photovoltaic performance relationship. The photovoltaic parameters such as energy level, optical band gap, and light-harvesting ability are highly dependent on the molecular structure of the donor monomer (including their appended flexible alkyl chain). Branched or linear alkyl groups on the same D block obviously vary the polymer steady-state absorption spectra and film morphology. For organic solar cells, this work allows tuning and control of the ultrafast dynamics, implying photovoltaic material design in the future.
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