研究目的
Investigating the effects of small molecule acceptors with different crystallinity and energy levels on the performance of nonfullerene-based all-small molecule organic solar cells.
研究成果
The study demonstrates that tuning the crystallinity of small molecule acceptors can significantly improve the performance of nonfullerene-based all-small molecule organic solar cells. The use of IDIC-4F as an acceptor, due to its higher crystallinity, resulted in a higher PCE of 9.43% compared to IDIC. This work highlights the importance of selecting appropriate acceptor materials with suitable crystallinity for enhancing solar cell efficiency.
研究不足
The study focuses on the crystallinity of the acceptor materials and its impact on device performance, but does not explore the effects of other variables such as donor material variations or different fabrication techniques.
1：Experimental Design and Method Selection:
The study involved the fabrication of nonfullerene-based all-small molecule organic solar cells using DFDT(DPP)2 as the donor and IDIC or IDIC-4F as acceptors to investigate the effects of acceptor crystallinity on device performance.
2：Sample Selection and Data Sources:
The materials used were supplied by Wuxi seniormaterial Inc. UV-visible absorption spectroscopy, AFM, and XRD were used for characterization.
3：List of Experimental Equipment and Materials:
Equipment included Cary 300 spectrophotometer, NT-MDT AFM, LabX XRD-6000 diffractometer, and a Keithley 2400 sourcemeter for device characterization.
4：Experimental Procedures and Operational Workflow:
Devices were fabricated with an inverted structure of ITO/ZnO/active layer/MoO3/Ag. The active layer was prepared by spin-coating from trichloromethane solution.
5：Data Analysis Methods:
The performance of the solar cells was evaluated through J-V characteristics and EQE measurements. Carrier mobility was assessed using the SCLC method.
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