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2. Pulsed-mode metalorganic vapor-phase epitaxy of GaN on graphene-coated c-sapphire for freestanding GaN thin films

Author

Lee, Seokje, Abbas, Muhammad S., Yoo, Dongha, Lee, Keundong, Fabunmi, Tobiloba G., Lee, Eunsu, Kim, Han Ik, Kim, Imhwan, Jang, Daniel, Lee, Sangmin, Lee, Jusang, Park, Ki-Tae, Lee, Changgu, Kim, Miyoung, Lee, Yun Seog, Chang, Celesta S., and Yi, Gyu-Chul

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

We report the growth of high-quality GaN epitaxial thin films on graphene-coated c-sapphire substrates using pulsed-mode metalorganic vapor-phase epitaxy, together with the fabrication of freestanding GaN films by simple mechanical exfoliation for transferable light-emitting diodes (LEDs). High-quality GaN films grown on the graphene-coated sapphire substrates were easily lifted off using thermal release tape and transferred onto foreign substrates. Furthermore, we revealed that the pulsed operation of ammonia flow during GaN growth was a critical factor for the fabrication of high-quality freestanding GaN films. These films, exhibiting excellent single crystallinity, were utilized to fabricate transferable GaN LEDs by heteroepitaxially growing InxGa1-xN/GaN multiple quantum wells and a p-GaN layer on the GaN films, showing their potential application in advanced optoelectronic devices., Comment: This document is the unedited Author's version of a Submitted Work that was subsequently accepted for publication in Nano Letters, copyright 2023 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.3c03333

Published
2023
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3. Classica Africana: Black Classicism and the Ownership of Narrative

Author

Lee, Eunsu

Subjects
Black classicism, classical reception, African American studies, transliteration, Homer
Abstract

Within the previous decade, the burgeoning re-imagination of the Greco-Roman canon in an African American context, presently referred to as “Black classicism,” has traversed artistic mediums not only as a cultural transliteration but an active subversion, rejection, and reclamation of the sociological underpinnings of a historically eurocentric area of study. Though modern reception studies are fraught with racial prejudice accusing Black authors of passively imitating—or merely deriving influence from—antiquity, I argue that the neoclassical inventions of Phillis Wheatley, W.E.B. Du Bois, Rita Dove, and Robert Hayden have transposed myth’s most defining elements onto two prominent social narratives: the public reception of African American scholarship and the collective female consciousness. Of these elements, imagery invoking the movement across transitory ‘liminal’ states has been enfranchised to actively subvert the traditionally-eurocentric classical canon while transferring intellectual ownership to African American authorship. Visualizations of the cyclicality of the rhapsodic oral tradition have further been harnessed to defend the female canon, translating myth’s cyclicality onto contemporaneous social dilemmas.

Published
2024

13. Pulsed-Mode Metalorganic Vapor-Phase Epitaxy of GaN on Graphene-Coated c-Sapphire for Freestanding GaN Thin Films

Author

Lee, Seokje, primary, Abbas, Muhammad S., additional, Yoo, Dongha, additional, Lee, Keundong, additional, Fabunmi, Tobiloba G., additional, Lee, Eunsu, additional, Kim, Han Ik, additional, Kim, Imhwan, additional, Jang, Daniel, additional, Lee, Sangmin, additional, Lee, Jusang, additional, Park, Ki-Tae, additional, Lee, Changgu, additional, Kim, Miyoung, additional, Lee, Yun Seog, additional, Chang, Celesta S., additional, and Yi, Gyu-Chul, additional

Published
2023
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