研究目的
To improve the performance of the PSCs by preventing the carrier recombination losses at the interfaces of the transparent metal oxide electrode/electron transport layer (ETL) / active absorber perovskite layer using a green synthesis approach for the preparation of flake like-ZnO nanostructure (GF-ZnO NSs).
研究成果
The bilayered ETL (c-TiO2/GF-ZnO NSs) perovskite solar cell devices achieved a maximum power conversion efficiency (PCE) of 7.83%, attributed to enhanced carrier extraction and reduced recombination losses at the interface between the ETL and the active perovskite layer. The study demonstrates the potential of green synthesized ZnO nanostructures as efficient electron transport materials in PSCs, offering a pathway to improve both efficiency and stability of perovskite-based optoelectronic devices.
研究不足
The study acknowledges the challenges in using single TiO2 electron transporting material for the fabrication of PSCs without pin-holes, which can lead to high leakage current and serious charge recombination at the ETL/TCO interface. The oxygen-related defects at the c-TiO2 surface may also induce the decomposition of the perovskite materials at the ETL/perovskite interface, degrading photovoltaic performances.
1：Experimental Design and Method Selection:
The study employed a green synthesis approach using Albizia Amara leaf extract as a reducing and capping agent for the preparation of flake-like ZnO nanostructures. The methodology included the fabrication of perovskite solar cells with different ETL configurations.
2：Sample Selection and Data Sources:
The samples included ITO substrates, compact TiO2 (c-TiO2), green synthesized flake-like ZnO nanostructures (GF-ZnO NSs), and chemically reduced ZnO (CR-ZnO) as ETL materials. The perovskite layer was CH3NH3PbI3-xClx.
3：List of Experimental Equipment and Materials:
Equipment included a field-emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscope (HRTEM), X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectrometer, UV-Visible spectrophotometer, and photoluminescence (PL) system. Materials included ITO glass substrates, methylammonium iodide (MAI), lead (II) chloride, and spiro-OMeTAD.
4：Experimental Procedures and Operational Workflow:
The procedure involved the preparation of GF-ZnO NSs using Albizia Amara leaf extract, fabrication of PSCs with different ETL configurations, and characterization of the materials and devices.
5：Data Analysis Methods:
The analysis included XRD for crystalline structure, FTIR for functional groups, UV-Vis for optical absorption, PL for recombination properties, and J-V measurements for photovoltaic performance.
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