Publication date: 17th February 2025
Phosphonic acid-based compounds containing carbazole chromophores have become a standard choice for forming perovskite solar cells. Recently, extending the π-conjugation of the carbazole unit through π-expansion has demonstrated improvements in efficiency and stability compared to 2PACz [1]. One notable feature of π-expanded carbazole systems is their reduced planarity due to the stericl effects. This leads to the possibility of forming two isomers with helical chirality. However, for such a simple compound, it is not possible to separate enantiomers due to the rapid racemization.
The introduction of chirality could potentially lead to the utilization of the chiral-induced spin selectivity (CISS) effect with potential new applications [2]. This phenomenon underscores the importance of designing materials that not only exhibit chirality but also meet the semiconducting requirements necessary for advanced electronic applications.
Motivated by these insights, we have explored several synthetic strategies aimed at further expansion of the π-conjugated system to develop chiral, helical compounds, capable of forming hole-selective monolayers. Here, we present preliminary results on the synthesis and investigation of such compounds obtained through multiple synthesis pathways.
I am deeply grateful to the Kaunas University of Technology Talent Academy and the SKILLed AI programme for granting me a one-time targeted scholarship in support of my participation at the HOPV 2025 conference.
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