研究目的
Investigating the photovoltaic performance of BDF copolymers in organic solar cells, specifically focusing on the effects of chlorine functionalization on the efficiency of the solar cells.
研究成果
The introduction of chlorine atoms into the BDF copolymer backbone effectively lowers the HOMO energy level, leading to a higher Voc in OSCs. The PBF1-C-2Cl:Y6 blend achieved a PCE of 13.10%, demonstrating the potential of chlorine functionalization in enhancing the performance of BDF-based OSCs. This work contributes to the development of high-efficiency OSCs using BDF copolymers.
研究不足
The study focuses on the comparison between two specific BDF copolymers and their performance in OSCs when blended with Y6. The generalizability of the findings to other copolymer systems or acceptors may be limited. Additionally, the impact of chlorine substitution on the polymer's crystallinity and charge transport properties could be further optimized.
1：Experimental Design and Method Selection:
The study involved the design and synthesis of two BDF copolymers, PBF1-C and PBF1-C-2Cl, with the latter incorporating chlorine atoms to modify its electronic properties. The photovoltaic performance of these copolymers was evaluated when blended with the non-fullerene acceptor Y
2：Sample Selection and Data Sources:
The copolymers were synthesized via palladium-catalyzed Stille coupling polymerization. The molecular weights were measured using gel permeation chromatography (GPC).
3：List of Experimental Equipment and Materials:
The study utilized common solvents for polymer dissolution, GPC for molecular weight measurement, and various spectroscopic and electrochemical techniques for characterization.
4：Experimental Procedures and Operational Workflow:
The copolymers were characterized using UV-Vis absorption, cyclic voltammetry, and GIWAXS to study their optical, electrochemical properties, and molecular packing. OSCs were fabricated with an inverted architecture to evaluate their photovoltaic performance.
5：Data Analysis Methods:
The photovoltaic parameters were analyzed based on the J-V characteristics and EQE spectra. Charge transport and recombination were studied using the SCLC method and light intensity dependence of Jsc.
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