研究目的
Investigating the application of a novel aqueous Sn-S complex solution as a precursor to fabricate SnO2 electron selective layers (ESLs) for hybrid perovskite solar cells (PSCs), focusing on its cost-effectiveness, environmental friendliness, and performance enhancement through doping.
研究成果
The aqueous Sn-S complex solution is an effective precursor for synthesizing SnO2 ESLs for PSCs, offering a low-cost, environmentally friendly, and easily doped method. Zn doping significantly improves PSC performance, while TiCl4 modifications enhance efficiency but reduce stability. The method shows promise for further efficiency improvements through ETL doping.
研究不足
The study highlights the trade-off between efficiency and stability when using TiCl4 modifications on SnO2 films, indicating a need for further optimization to enhance long-term stability without compromising performance.
1：Experimental Design and Method Selection
The study involved the preparation of SnO2 thin films using an aqueous Sn-S complex solution as a precursor, followed by deposition and annealing. The method was designed to be low-cost and environmentally friendly, with a focus on the compatibility of doping with various elements.
2：Sample Selection and Data Sources
Materials used included Sn (99.99%), S (99.999%), (NH4)2S (40wt%-48wt% in H2O), and doping elements (Zn, Cd, Cu, Li). The perovskite solar cells were fabricated with a planar configuration of FTO/ETL/perovskite/spiro/Au.
3：List of Experimental Equipment and Materials
Field emission SEM (FESEM, Zeiss Ultra Plus), X-ray powder diffraction (XRD, D8 Advance), synchronous thermal analyzer (STA 449 F3), UV-vis absorption spectroscopy (Lambda 750, Perkin Elmer), solar simulator (Oriel 94023A, 300 W).
4：Experimental Procedures and Operational Workflow
The Sn-S complex solution was prepared by dissolving Sn and S in (NH4)2S aqueous solution. The solution was then spin-coated on FTO substrates and annealed at 450 ℃. Doping was achieved by adding metal ion ammonia solutions to the Sn-S complex solution. The perovskite layer was deposited via an anti-solvent method, followed by the deposition of spiro-OMeTAD and Au electrodes.
5：Data Analysis Methods
The performance of the PSCs was evaluated using a solar simulator under AM 1.5G sunlight. The morphology and phase purity of the films were characterized by SEM and XRD, respectively. Optical properties were assessed using UV-vis spectroscopy.
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