研究目的
To design and synthesize novel volatilizable solid additives for organic solar cells (OSCs) that can improve photovoltaic performance and stability by optimizing active layer morphology without the drawbacks associated with high boiling point liquid additives.
研究成果
The study demonstrates that volatilizable solid additives can significantly enhance the efficiency and stability of non-fullerene OSCs by optimizing active layer morphology. The additives' ability to evaporate upon thermal annealing and their interaction with the electron acceptor lead to improved π–π stacking and charge transport, offering a promising strategy for the development of high-performance OSCs.
研究不足
The study focuses on specific non-fullerene acceptor systems (PBDB-T-2F:BTP-4F and PBDB-T-2F:IT-4F), and the generalizability to other systems may require further investigation. The long-term stability under various environmental conditions beyond ambient storage was not extensively explored.
1：Experimental Design and Method Selection:
Three volatilizable solid additives with different degrees of fluorination were designed and synthesized. These additives were added into photovoltaic solutions to fabricate OSCs. The additives' effects on device performance and morphology were investigated.
2：Sample Selection and Data Sources:
PBDB-T-2F:BTP-4F and PBDB-T-2F:IT-4F were used as the active materials in OSCs. The additives' solubility in common organic solvents was tested.
3：List of Experimental Equipment and Materials:
A Bruker Avance Ⅲ HD 500 MHz spectrometer for NMR, UV-Visible spectrophotometer for film absorption spectra, atomic force microscope for surface morphology, and synchrotron grazing-incidence small-angle X-ray scattering for molecular packing characterization.
4：Experimental Procedures and Operational Workflow:
OSCs were fabricated with an inverted structure. The active layer solutions were prepared with additives, spin-coated, and thermally annealed. Device performance was tested under AM 1.5G illumination.
5：5G illumination.
Data Analysis Methods:
5. Data Analysis Methods: The space charge-limited current method was used to characterize charge mobility. Molecular dynamic simulations were performed to understand interactions between additives and the electron acceptor.
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