研究目的
Investigating the development of a new, simple, and novel oblique electrostatic inkjet (OEI) technique for depositing TiO2 compact layers (CL) on FTO substrates without a vacuum environment for use as electron transport layers (ETL) in planar perovskite solar cells (PSCs).
研究成果
The OEI technique successfully deposited high-quality TiO2 CLs on FTO substrates without a vacuum environment, achieving a PCE of up to 13.19% in planar PSCs. The technique offers a simple, low-cost, and scalable method for fabricating efficient ETLs, with potential for further improvements through surface engineering or elemental doping.
研究不足
The OEI technique, while promising, requires further optimization for large-scale production, including the development of a multi-nozzle system to address the current limitation of single nozzle coverage width. The hysteresis phenomenon in device characteristics also needs to be minimized.
1：Experimental Design and Method Selection
Developed a novel oblique electrostatic inkjet (OEI) technique for depositing TiO2 compact layers (CL) on FTO substrates. The technique allows control over surface morphology and thickness by manipulating coating time.
2：Sample Selection and Data Sources
FTO-patterned glass substrates were used. TiO2 precursor solutions of varying concentrations were prepared and deposited using OEI, spin-coating, and spray pyrolysis methods for comparison.
3：List of Experimental Equipment and Materials
FTO-patterned glass substrates, lead iodide (PbI2), methylammonium bromide (MABr), lead bromide (PbBr2), formamidinium iodide (FAI), cesium iodide (CsI), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), titanium diisopropoxide bis(acetylacetonate), 2-isopropanol, Terumo syringe, San-ei Tech Ltd TT taper nozzle, muffle furnace, Keithley 2401 digital source meter, monochromatic xenon arc light scheme, field emission scanning electron microscopy (S-4800, Hitachi High-Tech).
4：Experimental Procedures and Operational Workflow
FTO substrates were cleaned and treated with UV ozone. TiO2 precursor solution was deposited using OEI with optimized parameters. The deposited films were dried and sintered. Perovskite layers were then spin-coated on the TiO2 CL, followed by the deposition of a hole-transport layer and gold electrode.
5：Data Analysis Methods
Surface morphology was examined using SEM. J-V characteristics were measured under simulated solar conditions. IPCE was measured to confirm the Jsc values.
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