Han Minsung, Byeon Junseop, Jang Jihun, Hur Changnyeong, Seo Gabseok, Choi Mansoo
Department of Mechanical Engineering Seoul National University Seoul 08826 Republic of Korea.
Global Frontier Center for Multiscale Energy Systems Seoul National University Seoul 08826 Republic of Korea.
Small Sci. 2023 Jul 18;3(9):2300069. doi: 10.1002/smsc.202300069. eCollection 2023 Sep.
The bar-coating technique for perovskite solar cells has been studied as a scalable process in relation to solar cell commercialization. In large-area bar coating, solvents with the high boiling points like dimethylformamide or -butyrolactone have difficulty in obtaining uniform and planar film at room temperature as they have slow evaporation rate. As an alternative, 2-methoxyethanol is a volatile and polar solvent, which is useful on a bar coating if applied using an air-blowing method with an air knife. Herein, a hot gas-blowing method for the fabrication of a perovskite layer to achieve both proper solvent evaporation and high crystallinity is developed. With 75 °C of N blowing on the bar-coated perovskite solution, highly crystalline perovskite films with large grains without voids are fabricated, showing excellent optical and electrical characteristics, such as long carrier lifetime, few carrier recombinations, and low trap density. Both small-area solar cells and large-area modules show good performance, 20.85% for the solar cell and 15.4% for the solar module. The results indicate that the newly proposed method can equally be applied to the fabrication of large-area solar cells toward commercialization.
就钙钛矿太阳能电池商业化而言，已将条形涂布技术作为一种可扩展的工艺进行了研究。在大面积条形涂布中，沸点较高的溶剂（如二甲基甲酰胺或丁内酯）在室温下难以获得均匀且平整的薄膜，因为它们的蒸发速率较慢。作为替代方案，2-甲氧基乙醇是一种挥发性极性溶剂，如果采用气刀吹气法进行条形涂布，它会很有用。在此，开发了一种用于制造钙钛矿层的热气吹气法，以实现适当的溶剂蒸发和高结晶度。在对条形涂布的钙钛矿溶液吹入75°C的氮气后，制备出了具有大晶粒且无空隙的高结晶度钙钛矿薄膜，显示出优异的光学和电学特性，如长载流子寿命、少载流子复合以及低陷阱密度。小面积太阳能电池和大面积组件均表现出良好性能，太阳能电池的效率为20.85%，太阳能组件的效率为15.4%。结果表明，新提出的方法同样可应用于大面积太阳能电池的制造以实现商业化。
