研究目的
Investigating the enhancement of hole-extraction capability in inverted perovskite solar cells (PSCs) through the use of molecules with controlled electron affinity to improve the performance of low-temperature processed hole transporting materials (HTMs).
研究成果
The use of molecules with high electron affinity significantly enhances the conductivity and energy level alignment of HTMs, leading to improved hole-extraction capability and photovoltaic performance of inverted PSCs. The F2HCNQ-modified NiOx HTM achieved a record PCE of 22.13% for rigid devices and 20.01% for flexible devices, demonstrating the method's potential for commercial application.
研究不足
The study is limited by the complexity of ionic doping in NiOx lattices, which may lead to unmanageable disorders and defects, reducing hole mobility and inducing recombination. Additionally, most ionic doping methods require high temperatures, making them incompatible with flexible plastic substrates.
1：Experimental Design and Method Selection:
The study involved the synthesis of NiOx nanoparticles and their modification with molecules of varying electron affinities (TCNQ, F2TCNQ, F4TCNQ, F2HCNQ) to enhance the conductivity and energy level alignment of HTMs.
2：Sample Selection and Data Sources:
Perovskite films were deposited on modified NiOx HTMs, and their photovoltaic performance was evaluated.
3：List of Experimental Equipment and Materials:
Instruments included atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and solar simulators. Materials included Ni(NO3)2·6H2O, NaOH, PbBr2, PbI2, CsI, MABr, MAI, PTAA, CuSCN, PEDOT:PSS, PC61BM, and BCP.
4：Experimental Procedures and Operational Workflow:
The process involved the synthesis of NiOx, modification with molecules, fabrication of PSCs, and characterization of their electrical and optical properties.
5：Data Analysis Methods:
Data were analyzed using techniques such as PL and TRPL spectroscopy, dark J-V curves, and electrochemical impedance spectroscopy (EIS).
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