Rediscovery of hybrid perovskites, such as CH3NH3PbX3, where X is Cl, Br, or I, in high-performance photovoltaic research has aroused lots of interest from the materials science community. Their exceptional properties, such as tunable direct bandgap, hight light absorption and long carrier diffusion length, might lead to paradigm-shifting technologies in the near future. I will discuss the perspective of applying hybrid perovskites in photovoltaic and optoelectronic devices, with a focus on photodetectors and phototransistors. Our experiments on perovskite phototransistors provided direct evidence on the ambipolar transport in perovskite films with balanced electron and hole mobilities. As an approach towards high-mobility devices, we found that carbon nanotubes embedded in perovskite films can serve as one-dimensional transport channels and significantly enhanced the charge mobility to a level comparable to common semiconductors such as crystalline silicon. Furthermore, two-dimensional metal dichalcogenides were used to boost the performance of perovskite-based photodetectors.
Dr. Tao (Tom) Wu received his B.S. degree from Zhejiang University in 1995 and Ph.D. degree from the University of Maryland, College Park in 2002. Before joining King Abdullah University of Science and Technology (KAUST) in February 2013 as Associate Professor, he worked at Argonne Nanotional Laboratory in Chicago and Nanyang Technological University (NTU) in Singapore. Dr. Wu has authored/co-authored nearly 200 peer-reviewed papers in the broad areas of oxide thin films, nanomaterials, and hybrid perovskites, with a focus on their electronic, magnetic and optical functionalities. He also serves as Associate Editor for ACS Applied Materials and Interfaces.
Industrial Engineering Nanomanufacturing and Nanotechnology Seminar Series.
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1001 Wang, Purdue University, West Lafayette, IN