研究目的
Investigating the effects of fluorinating a dopant-free hole transporting material on the efficiency and stability of inverted perovskite solar cells.
研究成果
The fluorinated derivative PFDT-2F-COOH outperformed PFDT-COOH as a dopant-free HTM in inverted PSCs, achieving a champion PCE of 21.68%. The improved performance was attributed to reduced carrier recombination and enhanced carrier extraction due to fluorination. Both HTMs demonstrated excellent operational and thermal stabilities, suggesting a viable strategy for developing high-efficiency and stable inverted PSCs.
研究不足
The study focuses on the specific effects of fluorination on the performance of PSCs using PFDT-COOH and PFDT-2F-COOH as HTMs. The generalizability of the findings to other HTMs or perovskite compositions may require further investigation.
1：Experimental Design and Method Selection:
The study involved the synthesis of two novel copolymers, PFDT-COOH and PFDT-2F-COOH, and their application as dopant-free HTMs in inverted PSCs. The methodology included UV-vis absorption spectra, cyclic voltammetry (CV) measurements, ultraviolet photoelectron spectroscopy (UPS) measurements, and device fabrication and testing.
2：Sample Selection and Data Sources:
The active layer was FA1-xMAxPbI3 mixed-cation perovskite. The thickness of HTMs was optimized by adjusting concentrations.
3：List of Experimental Equipment and Materials:
Instruments used included SEM, AFM, CV, UPS, XPS, and EIS. Materials included PFDT-COOH, PFDT-2F-COOH, and perovskite precursors.
4：Experimental Procedures and Operational Workflow:
The study involved the synthesis of HTMs, fabrication of PSCs, and characterization of their photovoltaic performance and stability.
5：Data Analysis Methods:
The analysis included the evaluation of photovoltaic parameters, charge recombination, and transport time constants.
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