研究目的
Investigating the effects of cesium carbonate (Cs2CO3) modification on the electron transport layers (ETLs) of perovskite solar cells (PSCs) to enhance photoelectric conversion efficiency (PCE) and stability.
研究成果
Modifying TiO2 ETLs with Cs2CO3 significantly improves the PCE of PSCs from 9.2% to 12.8% and enhances device stability, maintaining 78% of the original efficiency after 250 h. The modification reduces defects, lowers work functions, and minimizes energy level barriers, facilitating better electron transport and reducing carrier recombination.
研究不足
The study focuses on the modification of TiO2 ETLs with Cs2CO3 and its impact on PSC performance. Potential areas for optimization include further reducing defects and exploring other modification materials for enhanced efficiency and stability.
1：Experimental Design and Method Selection:
The study involved modifying TiO2 ETLs with Cs2CO3 to improve electron injection and reduce defects. The PSCs were fabricated with a structure of FTO/TiO2/Cs2CO3/perovskite (MAPbI3)/sprio-OMETAD/back electrode.
2：Sample Selection and Data Sources:
Fluorine-doped tin oxide (FTO) conductive glass was used as the substrate. The perovskite solution was prepared using lead iodide (PbI2) and methylammonium iodide (MAI).
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM, Quanta 450 EFG), ultraviolet–visible spectrophotometer (UV–vis, Cary 5000), and an electrochemical workstation (CHI-660E). Materials included Cs2CO3, TiO2, and spiro-OMeTAD.
4：Experimental Procedures and Operational Workflow:
The TiO2 ETL was spin-coated on FTO glass, followed by Cs2CO3 modification. The perovskite layer was then spin-coated, and the device was completed with a hole transport layer and carbon electrode.
5：Data Analysis Methods:
The performance of PSCs was evaluated through photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS).
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