研究目的
To synthesize and characterize a new spiro-based electron transport material (ETM) for high-performance perovskite solar cells (PSCs) that overcomes the limitations of conventional fullerene derivatives.
研究成果
The new spiro-based ETM SPS-4F demonstrates high performance in inverted PSCs with a power conversion efficiency over 20% and excellent stability in air. The strong coordination between SPS-4F and MAPbI3 perovskite leads to efficient surface trap passivation, contributing to the high performance of the PSCs. This work paves the way for the development of low-cost, high-performance PSCs using spiro-based nonfullerene ETMs.
研究不足
The study focuses on the performance of SPS-4F in inverted PSCs and its comparison with PC61BM. The long-term stability and scalability of SPS-4F-based PSCs in practical applications require further investigation.
1：Experimental Design and Method Selection:
The study involved the synthesis of a new organic semiconductor SPS-4F using a spiro[fluorine-9′9-thioxanthene] unit to construct a π-extended core. The material was characterized and tested in inverted PSCs.
2：Sample Selection and Data Sources:
MAPbI3 perovskite was used as the active layer in the PSCs. The performance of SPS-4F as an ETM was compared with that of PC61BM.
3：List of Experimental Equipment and Materials:
Instruments used include UV–vis spectrophotometer, cyclic voltammetry (CV), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning kelvin probe microscopy (SKPM).
4：Experimental Procedures and Operational Workflow:
The synthesis of SPS-4F involved several steps including Suzuki coupling reaction, Friedel–Crafts reaction, and Knoevenagel condensation. The PSCs were fabricated with the structure ITO/PTAA/MAPbI3/SPS-4F/PDIN/Ag.
5：Data Analysis Methods:
The performance of the PSCs was evaluated through current density–voltage (J–V) characteristics, external quantum efficiency (EQE) spectra, and electrochemical impedance spectroscopy (EIS).
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