Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Lead halide perovskites (LHP) show unique properties such as an easy modification by anion exchange or the lack of trap states within the band gap. Therefore, they exhibit great prospects for application in LED and photovoltaics. For these applications, it is essential to know the absolute band edge positions, in particular for building efficient devices. A method to study the electronic structure is a combination of photoluminescence spectroscopy and electrochemical techniques which is also referred to as spectroelectrochemistry (SEC).[1,2]
In our work, we aim to tune the electronic structure of CsPbBr3 nanocrystals by altering their surface chemistry. Cinnamic acid has been used as a model molecule for introducing different dipole moments to PbS nanocrystals.[3] Here, we adapt the strategy toward LHPs, and establish ligand exchange protocols to remove the native ligands after hot-injection synthesis by derivatives of cinnamic acid. We proceed with studying the band edge positions by SEC of such newly functionalized LHPs to assess their suitability for application in LEDs.
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