Chemical and Biomolecular Engineering
Dr. Aditya Mohite
Los Alamos National Laboratory
The Emergence of Hybrid-Perovskites for Low-Cost, High-Efficiency Light-to-Energy Conversion Devices
Tuesday, April 18, 2017
to 3:30 PM
102 Keck Hall
6100 Main St
Houston, Texas, USA
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 integrated into thin-films relevant for devices, the novel properties visualized at a single element level are overshadowed by even a small degree of polydispersity and disorder, which manifests as non-reproducible and inefficient charge and energy transport. An ideal solution to these fundamental problems requires: (i) growth of high quality bulk-like materials with fewer electronic impurities, (ii) reduced number of interfaces, and (iii) creation of clean defect-free interfaces between the materials and macroscopic contacts.
Inorganic-organic (or hybrid) perovskites have emerged as a disruptive materials technology, which has demonstrated an extraordinary potential for clean sustainable energy technologies and low-cost optoelectronic devices. However, in spite of the unprecedented progress in the past five years, key challenges that exists in the field today is the large degree of processing dependent variability in the structural and physical properties. This has limited the access to the intrinsic properties of hybrid perovskites and led to to multiple interpretations of experimental data. In addition to this, the stability and reliability of devices has also been strongly affected and remains an open question, which might determine the fate of this remarkable material despite excellent properties. In this talk, I will describe my team’s recent efforts to overcome these key issues through the discovery of a unique approach for thin-film crystal growth as a general strategy for growing highly crystalline, thin-films with low defect densities for both three-dimensional and the quantum/dielectric confined layered two-dimensional (2D) hybrid perovskites. This has allowed access to the intrinsic charge and energy transport processes within the perovskite thin-films resulting in reproducible and technologically stable high-efficiency devices. I anticipate that the scientific understanding gained through these studies will enable and establish the design principles that will lead to the accelerated use of perovskite based materials for a broad range of energy applications, such as photovoltaics, solar water-splitting, detectors, light emitting devices, sensors and energy/charge storage.
Biography of Dr. Aditya Mohite:
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 85 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 and has also been successful in generating more than $10 Million in funding through internal and external funding agencies.