研究目的
Investigating the impact of charge density modulation on the electronic structure, molecular packing, and photovoltaic performance of asymmetric fused-ring acceptors (FRAs) in organic solar cells (OSCs).
研究成果
The research demonstrates that electronic density modulation on asymmetric FRAs is an effective strategy to optimize OSC performance. IPT-4F, with a balanced trade-off between JSC and VOC, achieved the highest PCE of 14.62%, highlighting the potential of side-chain engineering in developing high-performance OSCs.
研究不足
The study is limited to the specific series of IPT-based FRAs and their performance with PM6 as the polymer donor. The impact of side-chain engineering on other types of FRAs or with different donors was not explored.
1：Experimental Design and Method Selection:
The study involved designing a series of IPT-based FRAs with different side-chains to modulate charge density. Theoretical models and DFT calculations were employed to understand the electronic effects.
2：Sample Selection and Data Sources:
Four FRAs (IN-4F, INO-4F, IPT-4F, and IPCl-4F) were synthesized and characterized using NMR, mass spectroscopy, and TGA.
3：List of Experimental Equipment and Materials:
Instruments included NMR spectrometers, mass spectrometers, TGA, UV-vis spectrophotometers, and CV for electrochemical properties.
4：Experimental Procedures and Operational Workflow:
FRAs were synthesized via Knoevenagel condensation, characterized, and used to fabricate OSC devices with a structure of ITO/PEDOT:PSS/active layers/PDIN/Al.
5：Data Analysis Methods:
Optical and electrochemical properties were analyzed using UV-vis and CV. Device performance was evaluated through J-V curves and EQE spectra.
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