研究目的
Investigating the diverse passivation effects of fullerene derivative on hysteresis behavior for normal and inverted perovskite solar cells.
研究成果
The study concludes that the sequence of PCBM and perovskite films significantly affects the hysteresis behavior in perovskite solar cells. The poor wettability of PCBM films leads to inefficient carrier extraction and severe hysteresis in normal cells, while the good wettability of perovskite films allows PCBM molecules to permeate and passivate defects, eliminating hysteresis in inverted cells.
研究不足
The study is limited to the specific materials and device structures used, and the findings may not be universally applicable to all perovskite solar cell configurations. The mechanisms behind the trapping/de-trapping processes and ion migration are complex and may require further investigation.
1：Experimental Design and Method Selection:
The study focuses on the correlation between the hysteresis phenomena and the interfacial contact of the PCBM-Perovskite system. It involves fabricating normal and inverted perovskite solar cells with different sequences of PCBM and perovskite films to study their effects on hysteresis behavior.
2：Sample Selection and Data Sources:
The samples include perovskite solar cells with normal and inverted structures. The data sources are the fabricated devices' performance metrics under one Sun illumination.
3：List of Experimental Equipment and Materials:
Materials include Lead (II) iodide (PbI2), Methylammonium iodide (MAI), Phenyl-C61-butyric acid methyl ester (PCBM), and others. Equipment includes SEM, PVIV201V I–V Station, electrochemical analyzer, and others.
4：Experimental Procedures and Operational Workflow:
The fabrication of devices involves cleaning ITO substrates, preparing perovskite precursors, spin-coating PCBM and perovskite films, and finally depositing Ag electrodes. Characterization involves SEM imaging, J-V performance testing, PL spectra measurement, and others.
5：Data Analysis Methods:
The analysis includes comparing hysteresis indexes, capacitance vs frequency properties, and transient responses of photocurrent and photovoltage.
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