研究目的
Investigating the enhancement of photovoltaic performance of conjugated polymers based on simple head-to-head alkylthio side chains engineered bithiophene.
研究成果
The introduction of SR side chains on the bithiophene unit in the copolymers significantly enhances the photovoltaic performance, as evidenced by the higher PCE of 6.25% for the PBTSR-FBTA-based device compared to PBTOR-FBTA and PBTOSR-FBTA-based devices. This demonstrates the effectiveness of SR side chain modification in improving the photovoltaic performance of polymers.
研究不足
The study focuses on the impact of SR side chains on the photovoltaic performance of copolymers, but does not explore the effects of other side chains or the scalability of the synthesis process for commercial applications.
1：Experimental Design and Method Selection:
The copolymers were synthesized via Stille-coupling polycondensation. The physicochemical properties, molecular stacking, carrier mobility, and morphologies of blend films were studied.
2：Sample Selection and Data Sources:
The samples were the synthesized copolymers PBTOR-FBTA, PBTOSR-FBTA, and PBTSR-FBTA.
3：List of Experimental Equipment and Materials:
High-temperature gel permeation chromatography (GPC) for molecular weight and polydispersity index (PDI) evaluation, thermogravimetric analysis (TGA) for thermal stability, differential scanning calorimetry (DSC) for thermal transition temperature, UV-vis absorption spectroscopy for optical properties, cyclic voltammetry (CV) for electrochemical properties, space charge limited current (SCLC) method for hole mobilities, atomic force microscopy (AFM) for surface morphology, and X-ray diffraction (XRD) for crystalline natures and molecular orientations.
4：Experimental Procedures and Operational Workflow:
The copolymers were synthesized, characterized, and used to fabricate polymer solar cells (PSCs) to evaluate their photovoltaic performance.
5：Data Analysis Methods:
The data were analyzed using various techniques including GPC, TGA, DSC, UV-vis, CV, SCLC, AFM, and XRD.
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GPC
Evaluating the molecular weight and polydispersity index (PDI) of the polymers.
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TGA
Determining thermal stability of the copolymers.
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DSC
Measuring thermal transition temperature (Tg) and crystallization temperature (Tc).
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UV-vis absorption spectroscopy
Studying the optical properties of the copolymers.
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CV
Studying the electrochemical properties of the copolymers.
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SCLC
Measuring the hole mobilities (μh) of photoactive layers.
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AFM
Determining the surface and bulk morphology of the active blend films.
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XRD
Testing the crystalline natures and molecular orientations of these copolymers in the solid states.
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