研究目的
Investigating the effects of a new benzodithiophene based donor-acceptor π-conjugated polymer (P1) as the photoactive donor for organic solar cells (OSCs), including its optoelectronic properties and the impact of solvent additives on its performance.
研究成果
The new π-conjugated polymer P1 demonstrates promising optoelectronic properties for use as a donor material in OSCs. The addition of DPE as a solvent additive significantly improves the photovoltaic performance by enhancing the active layer morphology and charge transport properties. This study highlights the potential of side chain engineering and solvent additives in developing high-performance OSCs.
研究不足
The study is limited to the evaluation of the new polymer P1 in combination with PC71BM as the acceptor. The impact of other acceptor materials or different solvent additives was not explored. Additionally, the study focuses on the morphological and optoelectronic properties without delving into long-term stability or scalability for industrial applications.
1：Experimental Design and Method Selection:
The study involved the design and synthesis of a new π-conjugated polymer (P1) via microwave-assisted Stille polymerization. The polymer's optoelectronic properties were characterized using UV-visible absorption spectroscopy and cyclic voltammetry (CV). OSC devices were fabricated with P1 as the donor and PC71BM as the acceptor, processed with and without the solvent additive diphenyl ether (DPE).
2：Sample Selection and Data Sources:
The polymer P1 was synthesized using electron-rich donor (D1) and electron-deficient acceptor (A1) units. The photovoltaic performance was evaluated using OSC devices with the configuration ITO/PEDOT:PSS/P1:PC71BM/LiF/Al.
3：List of Experimental Equipment and Materials:
Gel permeation chromatography (GPC) for molecular weight determination, UV-visible absorption spectroscopy, CV for energy level determination, atomic force microscopy (AFM) for morphology analysis, and space charge limited current (SCLC) method for charge transport behavior analysis.
4：Experimental Procedures and Operational Workflow:
The polymer was synthesized, characterized, and used to fabricate OSC devices. The devices' performance was evaluated under AM
5：5 G irradiation. Data Analysis Methods:
The photovoltaic parameters (Voc, Jsc, FF, and PCE) were analyzed from J-V measurements. The EQE spectra were used to calculate integrated Jsc values. AFM images were analyzed for surface morphology, and SCLC method was used to calculate hole mobility.
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