Halide Perovskite Derivatives for Gas Storage and Optical Sensing

Mondal, Anamika (2025) Halide Perovskite Derivatives for Gas Storage and Optical Sensing. PhD thesis, Indian Institute of Science Education and Research Kolkata.

Text (PhD thesis of Anamika Mondal (19RS006)) 19RS006.pdf - Submitted Version Restricted to Repository staff only Download (19MB)

Abstract

The reduction of molecular dimensionality of hybrid perovskites has attracted considerable interest due to their structural adaptability, distinctive excitonic behavior, and promising applications in photovoltaics, optoelectronics, sensing, nanoactuator and gas storage. The work done in this thesis revolves around the development of new hybrid halide phases, different structural and surface engineering strategies, band structure regulation and exploring various applications. In the introductory section of the thesis, renewable energy conversion and storage have been emphasized with a focus on the unique applications of halide perovskites and lowdimensional hybrid halides. The discussion highlights the dimension-dependent structural, optical and optoelectronic properties, various synthesis and device fabrication approaches. Chapter 2 provides the synthesis and fabrication methodologies, characterization tools applicable to halide perovskites, both in nanocrystals (NCs) and single-crystal forms, along with the computational approaches. In chapter 3, a solid-state ammonia storage strategy is demonstrated. The reversible ammonia uptake and release is governed by a reversible structural transition in Cu-based 2D Ruddlesden-Popper hybrid perovskite, and its dynamic non-covalent interactions. Fast ammonia uptake with structural reversibility over multiple cycles has been highlighted with cycle-dependent electronic modulation, showcasing the hybrid halide as a potential hydrogen carrier. Chapter 4 addresses the key prospects of structural engineering aspect for zero-dimensional In-based hybrid halide single crystals to enhance visible-light photodetection ability. Closely spaced polyhedra and selectively engineered anion vacancies over conventional octahedral connectivity achieve an exceptional bias-tunable and self-powered photodetector performance. Chapter 5 highlights a thermal stress-regulated structural modification in 2D Cu-based Dion-Jacobson halide perovskites, where different environment-regulated thermal treatment modulates the lattice structure to enhance the visible light photodetection by suppressing conventional UV detection of Cu-based systems. Chapter 6 deals with facet-engineering by ligand dynamics in Cs₂AgBiBr₆ NCs, where short-chain amines (12-C) effectively stabilize (400) facet, increasing the NC edge length, and improving the NC packing density. It facilitates charge transport as well as optoelectronic properties, as a promising alternative to CsPbX₃. Chapter 7 outlines an overall summary of the thesis and a discussion of the future prospects.

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