研究目的
Investigating the effect of fluorination on the benzothiadiazole acceptor unit in conjugated polymers for application in non-fullerene polymer solar cells.
研究成果
The fluorination of the benzothiadiazole acceptor unit in the polymer backbone significantly improves the power conversion efficiency of non-fullerene polymer solar cells by enhancing charge transport, reducing energy loss, and improving exciton dissociation and charge collection efficiencies.
研究不足
The study focuses on the effect of fluorination on the benzothiadiazole acceptor unit and its impact on photovoltaic properties, but does not explore the full range of possible acceptor units or donor-acceptor combinations. The optimization of device fabrication parameters could further improve performance.
1：Experimental Design and Method Selection:
Designed and synthesized two A1-D1-A2-D1 conjugated copolymers with same DTID acceptor and thiophene donor but different A2 acceptor units (BT and f-BT). Investigated their optical and electrochemical properties.
2：Sample Selection and Data Sources:
Used P113 and P114 polymers with ITIC-m as the non-fullerene acceptor for fabricating solution processed bulk heterojunction active layer solar cells.
3：List of Experimental Equipment and Materials:
Utilized gel permeation chromatography (GPC) for molecular weight determination, cyclic voltammetry (CV) for electrochemical properties, and transmission electron microscopy (TEM) for morphology studies.
4：Experimental Procedures and Operational Workflow:
Fabricated PSCs with structure ITO/PEDOT:PSS/active layer/PFN/Al. Optimized active layers through solvent vapor annealing (SVA) treatment.
5：Data Analysis Methods:
Analyzed photovoltaic performance using J-V characteristics, IPCE spectra, and charge transport properties via space charge limited current (SCLC) model.
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