研究目的
Investigating the effects of alkali and transition metal-doped TiO2 hole blocking layers on the performance of perovskite solar cells obtained by a two-step sequential deposition method in air and under vacuum.
研究成果
The study successfully demonstrated that doping TiO2 with yttrium and using CVD for perovskite layer deposition significantly improves the power conversion efficiency of perovskite solar cells. The highest efficiency of 12.89% was achieved for devices processed under vacuum with Y-doped TiO2.
研究不足
The study is limited by the comparison of only two doping materials (Cs and Y) and two deposition methods (spin-coating and CVD). The efficiency of the devices could be further optimized by exploring other dopants and deposition techniques.
1：Experimental Design and Method Selection:
The study involved the synthesis of perovskite solar cells with doped TiO2 layers using sol-gel spin-coating deposition. The perovskite layer was deposited via two methods: spin-coating in air and chemical vapor deposition (CVD) under vacuum.
2：Sample Selection and Data Sources:
The materials used include methyl ammonium iodide (CH3NH3I), FTO coated glass substrates, Spiro-MeOTAD, PbI2, titanium isopropoxide (TTIP), and dopants (CsCl and Y2O3).
3：3). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: X-ray diffractometer, scanning electron microscope, UV-vis spectrophotometer, Keithley 2420 source meter.
4：Experimental Procedures and Operational Workflow:
The TiO2 layers were deposited on FTO substrates, followed by perovskite layer deposition via spin-coating or CVD. The devices were characterized for structural, optical, and photovoltaic properties.
5：Data Analysis Methods:
The data were analyzed using Scherer's equation for crystallite size, Tauc plot for optical band gap, and J-V characteristics for solar cell performance.
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