Solvent-Free MACl Post-Treatment Using Close-Spaced Sublimation Method for Dry-Processed Perovskite Solar Cells

초록

This study introduces a solvent-free close-spaced sublimation (CSS) method for both perovskite conversion and post-treatment. A PbI2 layer is deposited via thermal evaporation and subsequently converted into MAPbI3 using CSS of Methylammonium iodide powder. The resulting MAPbI3 layer is further passivated with MACl powder using the identical CSS method. Through this post-treatment, it is possible to improve the quality of the perovskite layer, leading to a decrease of defect density and enhancing photovoltaic performances. As a result, device efficiency improves from 14.6% to 16.4%, with notable increases in J sc and V oc, along with a reduction in hysteresis. The potential of this solvent-free CSS method is demonstrated, making it a promising approach for large-scale manufacturing of perovskite and tandem solar cells.

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