| dc.description.abstract | Perovskite solar cells as the most promising material due to low temperature solution processability and low cost have surpassed 20% power conversion efficiency through change element composition. Tuning the composition will change the band gap and the morphology, but it is a complicate procedure to optimize element composition. In general, several composition of precursor must be prepared and tested sequentially. Lack of efficient experimental method to optimize component rapidly. Moreover, it is necessary to develop practical processes that enable the fabrication of up-scale, high-throughput, and high-quality thin films.
In this study, perovskite solar cells are fabricated via ultrasonic spray-coated technology combined with multi-channel syringe pump control system. The system provides an experimental method to optimize composition rapidly through adjusting different pumping rates of precursor, and simplifying cumbersome experimental steps and saving raw materials. First, we aim to optimize the halide ratio of CH3NH3PbI3-xBrx precursor based on PbI2, MAI, MABr, and PbI2, PbBr2, MAI respectively. Then, figuring out whether bromide ions from distinguish compounds will have influence on optimizing process. Furthermore, an effective method flash annealing under vacuum is adopted to enhance quality of perovskite thin film with power conversion efficiency of up to 17.1% for small device. Meanwhile, a 70 cm2 high quality perovskite thin film is obtained through optimizing spray-coated parameters and routes with highest efficiency of 17% and 14.95% for average. The process presents a way toward a scalable and industrially compatible manufacturing process capable of creating high-performance perovskite solar cells.
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