Dr. Ratnakar Palai Profile

Dr. Ratnakar Palai

at Univ of Puerto Rico

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Proceedings Article | 4 November 2016 Presentation

Rare earth doped III-nitride semiconductors for spintronic and optoelectronic applications (Conference Presentation)

Ratnakar Palai

Proceedings Volume 9931, 993104 (2016) https://doi.org/10.1117/12.2238809

KEYWORDS: Magnetic semiconductors, Semiconductors, Spintronics, Optoelectronics, Gallium nitride, Ultraviolet radiation, Light emitting diodes, Visible radiation, Communication and information technologies, Semiconductor materials

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Since last four decades the information and communication technologies are relying on the semiconductor materials. Currently a great deal of attention is being focused on adding spin degree-of-freedom into semiconductor to create a new area of solid-state electronics, called spintronics. In spintronics not only the current but also its spin state is controlled. Such materials need to be good semiconductors for easy integration in typical integrated circuits with high sensitivity to the spin orientation, especially room temperature ferromagnetism being an important desirable property. GaN is considered to be the most important semiconductor after silicon. It is widely used for the production of green, blue, UV, and white LEDs in full color displays, traffic lights, automotive lightings, and general room lighting using white LEDs. GaN-based systems also show promise for microwave and high power electronics intended for radar, satellite, wireless base stations and spintronic applications. Rare earth (Yb, Eu, Er, and Tm) doped GaN shows many interesting optoelectronic and magnetoptic properties e. g. sharp emission from UV through visible to IR, radiation hardness, and ferromagnetism. The talk will be focused on fabrication, optoelectronic (photoluminescence, cathodeluminescence, magnetic, and x-ray photoelectron spectroscopy) properties of some rare earth doped GaN and InGaN semiconductor nanostructures grown by plasma assisted molecular beam epitaxy (MBE) and future applications.

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