研究目的
To improve the planar perovskite solar cell efficiency by applying a thin layer of titanium dioxide (TiO2) comprising of PbS QDs-doped TNTs as an electron transport layer (ETL).
研究成果
The incorporation of PbS QDs-doped TNTs into TiO2 film as an ETL significantly improved the performance of perovskite solar cells, achieving a PCE of 14.95%. This enhancement was attributed to improved charge transport and extraction, and well-matched energy levels.
研究不足
The study did not explore the long-term stability of the solar cells under various environmental conditions beyond three months. The scalability of the synthesis and deposition methods for industrial applications was not addressed.
1：Experimental Design and Method Selection
The study employed hydrothermal and impregnation methods to prepare PbS QDs-doped TNTs. The TiO2 solution was prepared and mixed with PbS QDs-doped TNTs at various concentrations for ETL deposition.
2：Sample Selection and Data Sources
Commercial TiO2 powder with an average particle size of 25 nm was used to synthesize TNTs. PbS QDs were doped onto TNTs to modify their electronic and optical properties.
3：List of Experimental Equipment and Materials
High-resolution transmission electron microscopy (HRTEM, JEOL-2100 Plus), X-ray diffraction (XRD, Bruker AXS, model D8 advance), UV-Vis spectrophotometer (Perkin Elmer Lambda 950), and field emission scanning electron microscopy (FESEM, Hitachi SU8230).
4：Experimental Procedures and Operational Workflow
TNTs were synthesized via hydrothermal method, followed by doping with PbS QDs. The ETL was deposited on FTO substrates using the convective deposition method. Perovskite and HTL layers were spin-coated, and an Au electrode was deposited by thermal evaporation.
5：Data Analysis Methods
The morphology and chemical composition were characterized by HRTEM and EDS. XRD was used for crystallinity analysis. UV-Vis spectrophotometry and UPS measurements were conducted for optical and electronic property analysis.
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