Synthesis and fabrication of heterostructures of novel semiconductors for device application

Abstract

This thesis presents a comprehensive investigation into the synthesis and fabrication of heterostructures comprising transition metal dichalcogenides (TMDs) and lead halide perovskite materials. The research focuses on exploring the growth mechanism, material properties and the potential applications of heterostructures of these materials in the field of optoelectronics. The study begins with a thorough examination of the synthesis routes for TMDs and perovskites, aiming to develop novel methods that enable the controlled growth of these materials with good optical and electrical properties. Special emphasis is placed on the synthesis of monolayer TMDs, leveraging growth promoters and optimizing chemical vapor deposition parameters to achieve improved control and reproducibility. Additionally, novel solvothermal methods are invented to grow lead halide perovskites with ultra-low dark currents. The thesis also discusses a technique to perform photolithography on water-soluble materials, enabling the fabrication of electrical devices out of water-soluble CsPbBr 3 . The final phase of the research focuses on the realization of heterostructures by combining TMDs and perovskites. A Transfer technique was developed for the successful transfer of 2D as well as perovskite materials. By employing this technique, we successfully fabricated photodiodes and LEDs out of the TMD perovskite heterostructures. Overall, this thesis provides a comprehensive understanding of the synthesis and fabrication of heterostructures involving TMDs and perovskites. The results obtained demonstrate the potential for these heterostructures in optoelectronic applications, including photodetectors, light-emitting diodes, and sensors. The research contributes to the ongoing efforts in developing advanced materials and devices for the next generation of optoelectronic technologies.