New approach to utilizing highly hydrophobic SAMs as hole transport layers in high-efficiency perovskite solar cells
발표자
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초록
내용
Recently, various carbazole-based self-assembled monolayers (SAMs) have been investigated for use in the hole transport layer (HTL) of perovskite solar cells (PSCs). In particular, [4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) is attracting attention as an HTL for high-efficiency PSC due to its potential for high VOC and FF. However, Me-4PACz has strong hydrophobicity due to its methyl group (-CH3) and long alkyl chain (C4H8), which makes it difficult to deposit a high-quality perovskite layer on top of conventionally coated MeO-4PACz. In this study, to overcome these limitations, a new SAM deposition method based on a vacuum process was attempted. As a result, a uniform perovskite layer could be deposited on Me-4PACz, and a PSC with 20% efficiency was realized. It is believed that the findings of this study can be a cornerstone for using SAM-based HTL with high hydrophobicity in the future.