Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.282
Publication date: 18th December 2023
Solution processability of high-quality metal halide perovskites (MHPs) with a wide range of compositions has enabled the unprecedented evolution of perovskite solar cells (PSCs) and perovskite light-emitting devices (PLEDs), which has fascinated researchers from academia and industry. Due to the ionicity and antibonding nature of valence and conduction band states, highly luminescent crystalline structures ranging from nanocrystals to thin films are produced in the case of metal halide perovskites using solution-based strategies. The vulnerability of the lattice of metal halide perovskites towards distortions is increased due to their ionic nature when exposed to bias and illumination both in materials and devices, which further amplifies ionic motions under operational conditions. Although the development in terms of efficiencies and stability has been phenomenal, the mixed conduction of electrons and ions has proven to be an "Achilles heel" for perovskite devices thus far. Mixed conduction behaviour allows migration and accumulation of ions in PSCs and PLEDs, which induce detrimental chemical and structural changes both in the bulk of MHP layer and at the interfaces under external stimuli. Interestingly, the nature of chemical bonding in other solution-processable molecular and quantum dot semiconductors has also provided us with adequate insights regarding their performance and stability issues, especially in a device configuration.
In my presentation, I will discuss some intriguing examples illustrating the significance of chemical bonding both in the active perovskite layer and charge conductors in a solar cell configuration.
M.I.D. acknowledges funding from the Royal Society.
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