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Aging of a Vanadium Precursor Solution: Influencing Material Properties and Photoelectrochemical Water Oxidation Performance of Solution-Processed BiVO <sub/>4</sub> Photoanodes
摘要： Metal–organic decomposition is an easy way to fabricate BiVO4 (BVO) photoanodes; however, it often experiences a reproducibility issue. Here, the aging duration of a vanadium precursor solution, vanadyl acetylacetonate in methanol, is identified as a factor that profoundly affects reproducibility. Substantial changes in structural, optical, and electrical properties of BVO films are observed upon varying aging time of vanadium precursor solutions, which subsequently impacts photoelectrochemical (PEC) water oxidation and sulfite oxidation reactions. With the optimum number of aging days (3 d), some deficiency of oxygen is observed, which is accompanied by an increase in carrier concentration and a reduced charge transfer resistance in the PEC device, which produces the highest PEC performance that is comparable to the state-of-the-art undoped BVO photoanodes. The findings point to the importance of understanding solution chemistry and demonstrate that utilization of the understanding of fine adjustment of the composition of BVO films can produce highly reproducible and efficient BiVO4 photoanodes.
关键词： solution aging,metal–organic decomposition,bismuth vanadate,chemical composition,photoelectrochemical water splitting
更新于2025-09-23 15:23:52
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Effect of Precursor Aging on Builta??In Potential in Formamidiniuma??Based Perovskite Solar Cells
摘要： Formamidinium-based perovskite with optimal bandgap and improved thermal stability is a promising active material for application in perovskite solar cells (PSCs). The hybrid precursor solutions, formed by adding various smaller cations, are often used for improving the phase stability in PSCs. In this work, we report the effort on understanding the aging effect of a methylammonium- and bromine-free formamidinium precursor solution on the performance of FA0.85Cs0.1Rb0.05PbI3-based PSCs. Our results reveal that deterioration in the built-in potential in the PSCs is closely associated with the formation of the secondary phase in the FA0.85Cs0.1Rb0.05PbI3 active layer. The formation of the secondary phase in the active layer is related to the hydrolysis of the precursor solution. The suppression of the moisture encroachment greatly enhances the durability of the precursor solution and performance reproducibility of the PSCs.
关键词： precursor solution aging,perovskite solar cell,secondary phase,built-in potential
更新于2025-09-23 15:21:01
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On the Stability of Precursor Solution for Perovskite Solar Cell: Mixture (FAI + PbI2) versus Synthetic FAPbI3 Crystal
摘要： We report here on the stability of precursor solution for perovskite solar cells. Solution is aged at ambient condition for 4 weeks, where two different precursor solutions are prepared by dissolving FAI and PbI2 in DMSO/DMF solvent (precursor mixture solution) and the synthesized single crystalline α-FAPbI3 in the same solvent (single crystal solution). Perovskite films are prepared by depositing fresh or aged solutions at weekly intervals. Photovoltaic parameters are hardly altered by aging the single crystal solution, while power conversion efficiency (PCE) is gradually decreased with aging time for the precursor mixture solution mainly due to the decreased photocurrent density and fill factor. Solution pH is changed from basic to acidic due to HI formed by aging the precursor mixture solution, which prevents the formation of α phase of FAPbI3, while, for the single crystal solution, basic condition remains unchanged by aging. In addition, the presence of δ phase in the annealed perovskite films is found to have ill influence on the long-term stability. It is thus important to keep pH of the precursor solution to avoid aging effect and remove δ phase in the annealed film for device stability.
关键词： precursor solution aging,FAPbI3,HI,pH,perovskite solar cells
更新于2025-09-23 15:19:57