Ph.D. student Kevin Lee wins award at international conference

kevin lee
Kevin Lee (Cornell ECE) presenting his research on blue LED based quantum emitters for which he was awarded the Student Award at IWN 2018 in Japan.

Kevin Lee, a Ph.D. student from the Jena-Xing Group recently received a student award at the 10th International Workshop on Nitride Semiconductors (IWN) in Kanazawa, Japan. Lee’s presentation was entitled "Comparison of Standard P-up and Buried Tunnel Junction Blue Light Emitting Diodes towards Integrated Single Photon Sources".

In collaboration with Prof. Gregory David Fuchs in the department of Applied and Engineering Physics at Cornell University and Dr. Henryk Turski, a PostDoctoral scholar at Cornell visiting from the Institute of High-Pressure Physics in Poland, Lee and his Cornell colleagues demonstrated a novel buried tunnel junction blue light emitting diodes (LEDs) emitting at 450nm (blue color) integrated with hexagonal boron nitride (hBN). Secure communication using quantum encryption is possible using the quantum characteristics of single photon emitters in hBN.

“The newly developed buried tunnel junction blue LEDs invented at Cornell show about three orders reduction in resistivity over traditional standard P-up LEDs,” said Lee. “More importantly, the fundamentally new device geometry and uniform emission over large areas in comparison with standard P-up LEDs enables new forms of single photon sources. Layered boron nitride was transferred to the blue LED and used a separate 532nm laser source to excite and confirm single photon emission behavior.”

Students from the Jena-Xing group with Prof Hiroshi Amano
Reet Chaudhuri (Left, Cornell ECE), Samuel Bader (2nd from Right, Cornell AEP), and Austin Hickman (Right, Cornell ECE) with Prof Hiroshi Amano, the 2014 Physics Nobel Prize winner for Nitride Photonics at the IWN 2018 conference reception.

The International Workshop on Nitride Semiconductors is a week-long biannual conference. This year it was attended by over 1200 participants from academic institutions, research institutes and industrial laboratories around the world to discuss the physics, materials science and photonic and electronic device applications of nitride semiconductor materials. Five students from the Jena-Xing group presented their research work on topics ranging from novel ultrafast and high voltage transistors to visible and ultraviolet LEDs. Professor Jena also gave a short course at the conference.

The Jena-Xing group is led by Debdeep Jena, the David E. Burr Professor of Engineering and Grace Xing, the William L. Quackenbush Professor of Electrical and Computer Engineering. Both Jena and Xing hold dual appointments with the School of Electrical and Computer Engineering and the Department of Materials Science and Engineering at Cornell University. Their group is focused on research projects involving growth, fabrication and characterization of semiconductor electronic and optical materials and devices, primarily III-V nitride semiconductors, 2D crystals, steep transistors, and more recently Gallium Oxide, multiferroics, superconducting and magnetic materials.

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