Abstract
In this work, we report the reproducible preparation method of highly uniform large-area perovskite CH3NH3PbI3 thin films by scalable single-source thermal evaporation with the area of 100 cm2. The microstructural and optical properties of large-area CH3NH3PbI3 thin films were investigated. The dense, uniform, smooth, high crystallinity of large-area perovskite thin film was obtained. The element ratio of Pb/I was close to the ideal stoichiometric ratio of CH3NH3PbI3 thin film. These films show a favorable bandgap of 1.58 eV, long and balanced carrier-diffusion lengths. The CH3NH3PbI3 thin film perovskite solar cell shows a stable efficiency of 7.73% with almost no hysteresis, indicating a single-source thermal evaporation that is suitable for a large area perovskite solar cell.
Highlights
Hybrid organic-inorganic halide perovskites were considered to be an attractive superstar for low-cost solar cell applications due to their high-power conversion efficiency (PCE) and straightforward fabrication process [1,2]
It was found that the A, B, C, D and E regions of large-area perovskite MAPbI3 thin films reveal strong characteristic diffraction peaks of (110), (220) and (330) planes of MAPbI3, usually assigned to the tetragonal crystal structure of halide perovskite [22,23]
There was no PbI2 or CH3 NH3 I detected in different regions, which indicates that it only goes through sublimation for the MAPbI3 powder to thin film during the evaporation process
Summary
Hybrid organic-inorganic halide perovskites were considered to be an attractive superstar for low-cost solar cell applications due to their high-power conversion efficiency (PCE) and straightforward fabrication process [1,2]. The highest certification efficiency of perovskite solar cells has exceeded 22% [6], the device areas are still small, with most of the areas being less than 1 cm. The highest certification efficiency of perovskite solar cells has exceeded 22% [6], the device areas are still small, with most of the areas being less than 1 cm2 This raises issues such as peripheral effects, measurement contacts, film uniformity, etc. The development of large-area perovskite solar cells is very important for future commercialization
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