Large-scale and high-quality III-nitride membranes through microcavity-assisted crack propagation by engineering tensile-stressed Ni layers
엔지니어링 스트레칭 응력 Ni층 마이크로 캐비티 보조 균열을 통해 확장된 대규모 고품질 III 패밀리 질소 필름
Películas de nitruro del Grupo III de alta calidad a gran escala para el crecimiento de grietas asistidas por microcavidades en la capa ni de tensión de tracción de Ingeniería
Film de nitrure de groupe III de haute qualité à grande échelle pour la propagation de fissures assistées par micro - cavités dans des couches de ni soumises à des contraintes de traction techniques
крупномасштабная высокомассовая нитридная пленка группы III с увеличенным напряжением при инженерном растяжении
Jung-Hong Min ¹, Kwangjae Lee ², Tae-Hoon Chung ³, Jung-Wook Min ¹, Kuang-Hui Li ¹, Chun Hong Kang ¹, Hoe-Min Kwak ⁴, Tae-Hyeon Kim ⁵, Youyou Yuan ⁶, Kyoung-Kook Kim ⁵, Dong-Seon Lee ⁴, Tien Khee Ng ¹, Boon S. Ooi ¹
¹ Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
² Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA
³ Light Source Research Division, Korea Photonics Technology Institute (KOPTI), Gwangju 61007, Republic of Korea
⁴ School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
⁵ Department of Advanced Convergence Technology, Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Republic of Korea
⁶ King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Opto-Electronic Science, 28 October 2022

Epitaxially grown III-nitride alloys are tightly bonded materials with mixed covalent-ionic bonds. This tight bonding presents tremendous challenges in developing III-nitride membranes, even though semiconductor membranes can provide numerous advantages by removing thick, inflexible, and costly substrates. Herein, cavities with various sizes were introduced by overgrowing target layers, such as undoped GaN and green LEDs, on nanoporous templates prepared by electrochemical etching of n-type GaN.

The large primary interfacial toughness was effectively reduced according to the design of the cavity density, and the overgrown target layers were then conveniently exfoliated by engineering tensile-stressed Ni layers. The resulting III-nitride membranes maintained high crystal quality even after exfoliation due to the use of GaN-based nanoporous templates with the same lattice constant. The microcavity-assisted crack propagation process developed for the current III-nitride membranes forms a universal process for developing various kinds of large-scale and high-quality semiconductor membranes.
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