The precise control over stoichiometry, microstructure and crystallinity of nanoscale materials from the atomic to the macroscale using low temperature solution-based approaches has been a fundamental bottleneck that has existed for nearly three decades. When assembled into thin-films using solution-based approaches, the beautiful physics visualized at a single element level are overshadowed even by a small degree of polydispersity resulting in low-efficiency, non-durable and non-reproducible devices.
My research over the past five years has attempted to overcome some of these key challenges by developing unique and innovative low-temperature methods to integrate materials into near single-crystalline thin-films, which has led to high efficiency devices with excellent durability.
In my talk, I will describe these approaches demonstrated on bulk and 2D perovskites materials system, which has lacked a systematic structure-property due to the high degree of variability in composition, crystalline quality, and grain-size with different thin-film processing approaches. This variability has led to multiple and often contradictory interpretations of experimental data.
I will describe our unique thin-film crystal growth approach to grow near single-crystalline perovskite thin-films, which results in thin-films with properties on par with high-quality direct band-gap semiconductors such as gallium arsenide. Importantly, the degree of crystallinity has direct consequences on the overall performance of devices but also dramatically influences their stability.
I anticipate that our results provide the key foundation for the fundamental and technological development of hybrid perovskite-based materials for high-efficiency and stable devices for the next generation clean energy applications.
Aditya Mohite is the PI of the Light to Energy team and directs an energy and optoelectronic devices lab working on understanding and controlling charge and energy transfer processes occurring at interfaces created with organic and inorganic materials for thin-film clean energy technologies.
His research philosophy is applying creative and “out-of-the-box” approaches to solve fundamental scientific bottlenecks and demonstrate technologically relevant performance in devices that is on par or exceeds the current state-of-the-art devices.
He has published more than 90 peer reviewed papers in journals such as Science, Nature, Nature Materials, Nature Nanotechnology, Nano Letters, ACS Nano, Chemical Society Reviews, Applied Physics Letters and Advanced Materials amongst others. He has also delivered more than 60 invited talks.