研究目的
To explore non-fullerene electron acceptors that possess favorable electron-accepting and transporting properties of fullerenes but overcome the shortcomings of fullerenes, such as weak absorption in the visible spectral region, limited chemical and energy level tunability, high-cost purification and morphological instability.
研究成果
The study demonstrated that the performance of organic solar cells can be markedly improved by fine structural design of the acceptor molecules. PDI-III, with its star-shaped structure and planar PDI units, showed the best performance with a PCE of 6.0%, highlighting the importance of molecular conformation in optoelectronic properties.
研究不足
The study is limited by the steric crowding in PDI-IV leading to twisted structures and lower electron mobility, affecting the photovoltaic performance. The synthesis yields for PDI-III and PDI-IV were lower compared to PDI-II.
1：Experimental Design and Method Selection:
Designed and synthesized three PDI derivatives (PDI-II, PDI-III, and PDI-IV) with different structures to investigate their optical, electrochemical, electron transport, and photovoltaic properties.
2：Sample Selection and Data Sources:
Used PDI derivatives blended with the donor polymer PBDB-T for device fabrication.
3：List of Experimental Equipment and Materials:
Utilized common organic solvents, Sonogashira coupling reactions, and various characterization techniques including UV-vis absorption spectroscopy, cyclic voltammetry, and atomic force microscopy.
4：Experimental Procedures and Operational Workflow:
Fabricated devices with an inverted structure of ITO/ZnO/active layer/MoO3/Al, optimized processing conditions, and measured photovoltaic performance.
5：Data Analysis Methods:
Analyzed data using space charge limited current method for charge transport properties and integrated EQE spectra for Jsc values.
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