研究目的
To explore the effects of chlorine and fluorine on photophysical properties and the differences in polymer solar cells.
研究成果
The introduction of Cl and F atoms can deeper the HOMO of polymers and enhance light absorption, improving Voc and Jsc. Chlorination is more effective than fluorination and easier to synthesize, making it advantageous for practical applications.
研究不足
The study focuses on the effects of chlorination and fluorination on a specific set of polymers, and the practical application may be limited by the synthesis and processing conditions.
1：Experimental Design and Method Selection
Synthesized five new polymers with benzo[1,2-b:4,5-b]dithiophene as the electron donating and benzothiadiazole as electron withdrawing, introducing Cl and F atoms to study their effects.
2：Sample Selection and Data Sources
Used hydrobromic acid, Br2, and various benzo[c][1,2,5]thiadiazole derivatives as starting materials.
3：List of Experimental Equipment and Materials
Bruker ARX spectrometer for NMR, TA (Q600SDT) unit for TGA, Waters Model 515 gel chromatography for molecular weight measurement, Cary 300 spectrophotometer for UV–Vis absorption spectra, CHI 660E model electrochemical workstation for CV.
4：Experimental Procedures and Operational Workflow
Synthesis involved bromination, polymerization, and purification steps. Device fabrication involved spin-coating and vapor deposition.
5：Data Analysis Methods
Used gel permeation chromatography for molecular weight, TGA for thermal stability, UV–Vis for absorption spectra, CV for electrochemical properties, and AFM for film morphology.
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