研究目的
To investigate the influence of energy alignment between electron transport layers (ETLs) and perovskite on the device performance of perovskite solar cells (PSCs) and to develop a homojunction bilayer ETL with cascade energy alignment for efficient PSCs.
研究成果
The homojunction bilayer ETLs with adjustable energy levels open a new direction for interface engineering toward efficient PSCs. The Sb-SnO2/SnO2 bilayer ETL with cascade energy alignment enhances charge separation and reduces carrier recombination, leading to improved device performance.
研究不足
The study focused on the energy alignment between ETLs and perovskite in PSCs, but other factors such as humidity, illumination, temperature, perovskite absorber layer, ETL, and electrodes could also influence the device performance and stability.
1：Experimental Design and Method Selection:
The study developed a homojunction bilayer ETL by stacking Sb-doped SnO2 (Sb-SnO2) and SnO2 ETLs via low-temperature spin-coating processes. The energy levels of ETLs were tuned by the incorporation of Sb and altering stacking orders.
2：Sample Selection and Data Sources:
The study used PSC devices fabricated on SnO2, Sb-SnO2, SnO2/Sb-SnO2, and Sb-SnO2/SnO2 ETLs.
3：List of Experimental Equipment and Materials:
The materials included SnO2 and Sb-SnO2 ETLs, perovskite absorber layers, and hole transport layers (HTLs). The equipment included X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV–Vis absorption spectra, photoluminescence (PL) characterizations, conductivity measurements, and electrochemical impedance spectroscopy (EIS) analysis.
4：Experimental Procedures and Operational Workflow:
The ETLs were spin-coated on ITO substrates, annealed, and characterized. The perovskite layers were deposited using a one-step method with anti-solvent treatment. The HTL was deposited on the perovskite layer, and the devices were completed with a thermally evaporated Au electrode.
5：Data Analysis Methods:
The study analyzed the performance of PSCs with different ETL configurations using J–V measurements, PL characterizations, conductivity measurements, and EIS analysis.
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