Growth and Carrier Transport in Gallium Oxide Polymorphs- [electronic resource]
Growth and Carrier Transport in Gallium Oxide Polymorphs- [electronic resource]
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101558
- ISBN
- 9798380314015
- DDC
- 621.3
- 서명/저자
- Growth and Carrier Transport in Gallium Oxide Polymorphs - [electronic resource]
- 발행사항
- [S.l.]: : Cornell University., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(192 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
- 주기사항
- Advisor: Jena, Debdeep.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약Since 2012, when the first β-Ga2O3 transistor was demonstrated in the seminal work by Higashiwaki, et al. the field has experienced exponential growth. The promise of a ~4.7 eV bandgap, bulk large-area substrates, and n-type electrical conductivity with doping control over four orders of magnitude -- has proven too much to resist. In the intervening years, the number of papers, the amount of funding, and the number of research groups working on β-Ga2O3 has continued to rise.The less studied polymorph, α-Ga2O3, has a larger intrinsic bandgap, Eg ~ 5.3 eV, and unlike β-Ga2O3, α-Ga2O3 can be alloyed with Al over the entire compositional range, reaching bandgaps of 8.8 eV. Moreover, these high mole fraction α-(Al,Ga)2O3 films have bulk, large-area substrates: sapphire. While doping of α-Ga2O3 has been achieved, the transport properties and capabilities of α-Ga2O3 and α-(Al,Ga)2O3 may be better realized through the use of molecular beam epitaxy (MBE) growth.The work presented here is devoted to solving problems which are associated with the realization of conductive α-Ga2O3 by MBE. (i) Annealing is a critical step in device fabrication and is used to activate ion implanted donors. Because the α-Ga2O3 is meta-stable, the α-phase reverts to the β-phase upon moderate annealing. (ii) Due to the oxygen rich environment in which MBE Ga2O3 growth occurs, controllable and repeatable doping has been a challenge for all polymorphs. (iii) Due to the kinetics and thermodynamics of MBE, and due to the complex mechanism which governs the formation and growth of Ga2O3, achieving conductivity in MBE grown Ga2O3 on sapphire has remained elusive. (iv) Achieving conductivity in Ga2O3 is only one-half of the problem. The other half is to ensure that there is no conductivity where it is undesired. The surface accumulation of Si impurities has been a barrier to achieving some high-performance devices regardless of growth technique.This thesis aims to solve each of these aforementioned issues, and make progress toward achieving high-performance α-Ga2O3 devices.
- 일반주제명
- Electrical engineering.
- 일반주제명
- Applied physics.
- 일반주제명
- Materials science.
- 키워드
- Gallium oxide
- 키워드
- Semiconductors
- 기타저자
- Cornell University Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-03B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.