Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)
Publication date: 17th October 2024
Carbazole-based phosphonic acids have recently emerged as efficient hole-selective contact materials in p-i-n perovskite solar cells, with 2PACz, or [2-(9H-carbazol-9-yl)ethyl]phosphonic acid being a widely used example [1]. These materials typically exhibit a “T-shaped” molecular structure, where the anchoring fragment and chromophore are connected via the nitrogen atom at the middle of the carbazole unit. This configuration, however, may result in voids within the self-assembled monolayer, potentially compromising stability.
To overcome this potential limitation, we propose an alternative "rod-shaped" molecular design that retains the carbazole chromophore while introducing the linker and anchoring groups through oxygen atoms at the 2 and 3 positions of the chromophore. This design is expected to enhance molecular packing density, thereby improving the stability and efficiency of the monolayer.
This presentation will provide the details on the synthesis and structural characterization of these novel compounds, as well as preliminary results from their application in perovskite solar cells.
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