Colloquium: Jayakanth Ravichandran - University of Southern California
Perovskite Chalcogenides are a new class of semiconductors, which have tunable band gap in the visible to infrared part of the electromagnetic spectrum. Besides this band gap tunability, they offer a unique opportunity to realize large density of states semiconductors with high carrier mobility. In this talk, I will discuss some of the advances made both in my research group and in the research community in theory, synthesis of these materials and understanding their optoelectronic properties. First, I will discuss how structure and chemical composition in Zr-containing perovskite sulfides can tune the optical properties in the visible spectrum, with an eye towards solar energy conversion. Second, I will discuss large optical anisotropy, especially in terms of linear optical properties such as birefringence and dichroism can be achieved in Ti-containing hexagonal variants of the perovskite structure. Finally, I will provide a general outlook for future studies on these exciting new class of materials, especially for optoelectronics and photonics.
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 S. Niu, H. Huyan, Y. Liu, M. Yeung, K. Ye, L. Blankemeier, T. Orvis, D. Sarkar, D. J. Singh, R. Kapadia, and J. Ravichandran, Adv. Mater. 27, 1604733 (2016).
Jayakanth Ravichandran is an Assistant Professor in the Mork Family Department of Chemical Engineering and Materials Science at University of Southern California. He received his Ph.D. degree from University of California, Berkeley in 2011. He performed post-doctoral research at Columbia University and briefly at Harvard University, before joining the current position. His research interests are in materials design, synthesis, characterization, and physical properties of complex materials for electronic, photonic, and energy applications. He was named an Early Career Scholar by the Journal of Materials Research in 2017 and was a Link Energy Fellow.