Prof. Subodh Gautam Mhaisalkar

Prof. Subodh Gautam Mhaisalkar
Executive Director,
Energy Research Institute @ NTU Tan Chin Tuan Centennial Professor,
School of Materials Science & Engineering College of Engineering,
Singapore



Title : Metal-Halide Perovskites: Exceptional Semiconducting Materials for High Performance Solar Cells and Light-Emitting Devices

Abstract

The past five years have witnessed remarkable advances in the field of solar cells and light-emitting devices with the perovskite metal halide, CH3NH3PbI3, and related family of materials. These semiconductors form nearly defect free, crystalline films at low temperatures that exhibit high optical absorption, long-range charge transport, and efficient charge collection, yielding high performance LEDs and solar cells. The prospects for advancing device efficiencies are contingent upon exploring new perovskite compositions and structures. One such structural variant is represented by lower-dimensionality layered perovskite derived from their 3D counterparts (ABX3) by increasing the distance between the interconnected inorganic sheets with the appropriate organic cations. Lower-dimensionality layered perovskites formulations permit for band gaps and exciton binding energy tuning, carrier mobility facilitated by the inorganic moeities, with the organic moieties providing additional controls for stability, light harvesting, and intralayer charge transport. Nanocrystals is yet another variant in perovskites that promises to yield new opportunities in advancing device performance. Perovskites are typically synthesised via wet-chemistry routes, allowing for mixing at a molecular level, and resulting in materials with high phase purity. By carefully controlling the reaction conditions such as temperature, solvent, and ligands, hybrid perovskites of morphologies ranging from 0D quantum dots to 3D single crystals; and sizes stretching 6 orders of magnitude can be prepared. This presentation will outline a broad palette of elemental substitutions, solid solutions, and multidimensional families that will provide the next step towards the advances of the perovskite solar cells and light-emitting devices. Challenges and opportunities in perovskite materials beyond methyl ammonium lead iodide, with emphasis on their recombination dynamics, optoelectronic properties, and integration into solar cells and light-emitting devices, will also be addressed.


Biography

Subodh Mhaisalkar is the Tan Chin Tuan Centennial Professor in the School of Materials Science & Engineering at the Nanyang Technological University (NTU), Singapore. Subodh is also the Executive Director of the Energy Research Institute @ NTU (ERI@N), a pan-University multidisciplinary research institute for innovative energy solutions. Prior to joining NTU in 2001, Subodh has over 10 years of research and engineering experience in the microelectronics industry and his areas of expertise and research interests includes semiconductor technology, perovskite optoelectronics, printed electronics, and energy storage. Subodh received his Bachelors' degree from IIT-Bombay and his MS/Ph.D. degrees from The Ohio State University.

Prof Subodh's main areas of research comprise semiconductor nanomaterials, photovoltaics, optoelectronics devices, and printed electronics. Common to these projects are methods of processing of semiconductors (perovskites, organic, nanocarbons, or oxide nanowires), fundamental device physics studies, and device integration.