研究目的
To design and synthesize a new non-fullerene small molecule acceptor (NF-SMA) named BP-4F for high efficiency polymer solar cells with a small voltage loss and excellent stability.
研究成果
The study successfully designed and synthesized a new non-fullerene small molecule acceptor BP-4F, which, when blended with PM6, achieved high efficiency polymer solar cells with a small voltage loss and excellent stability. The devices showed an average PCE of 13.9%, low Eloss of 0.59 eV, and retained near 90% of initial PCE in air under dark and 93.5% under continuous illumination for 720 hours, indicating BP-4F's potential for practical applications.
研究不足
The study does not discuss the scalability of the synthesis process or the cost-effectiveness of the materials for large-scale production. Additionally, the long-term stability under various environmental conditions beyond the tested scenarios is not explored.
1：Experimental Design and Method Selection
The study involved the design and synthesis of a new A-D-A type non-fullerene acceptor BP-4F, based on benzo[1,2-b:4,5-b’]di(cyclopenta[2,1-b:3,4-b’]dithiophene) with 4-(2-ethylhexyl)phenyl conjugated side chains (BDT-P) as an electron-donating core, flanked with the strong electron-withdrawing 2FIC unit. The photovoltaic performance was evaluated using an inverted device structure.
2：Sample Selection and Data Sources
The samples included the synthesized BP-4F and the wide bandgap polymer PM6. Data were sourced from optical and electrochemical measurements, photovoltaic performance tests, and stability studies.
3：List of Experimental Equipment and Materials
Equipment and materials included ITO/ZnO/PFN-Br/PM6:BP-4F/MoO3/Ag for device fabrication, thermal gravimetric analysis (TGA) for thermal stability, cyclic voltammetry (CV) for electrochemical properties, and space-charge limited current (SCLC) method for mobility measurements.
4：Experimental Procedures and Operational Workflow
The synthesis of BP-4F involved Pd(PPh3)4 catalyzed Stille-coupling reaction, Grignard reaction, intramolecular cyclization, and Knoevenagel condensation. Device fabrication included spin-coating of active layers, thermal annealing, and characterization under AM 1.5 G illumination.
5：Data Analysis Methods
Data analysis included calculating PCE, Voc, Jsc, FF, and Eloss from J-V curves, integrating Jsc from EQE spectra, and analyzing charge dissociation probability and recombination behavior from photocurrent density versus effective applied voltage plots.
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