Preparation of β-Ga2O3/ε-Ga2O3 type II phase junctions by atmospheric pressure chemical vapor deposition

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.472

Xianxu Li , Jiale Niu , Lijian Bai , Xue Jing , Dongwen Gao , Jiajun Deng , Fangchao Lu , Wenjie Wang

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引用次数: 0

Abstract

We synthesized β-Ga₂O₃/ε-Ga₂O₃ phase junctions by exploiting distinct crystalline phases in gallium oxide through a one-step atmospheric-pressure chemical vapor deposition process on sapphire substrates, adjusting parameters such as temperature and gas flow rate accordingly. The coexistence of these two crystalline phases was verified via X-ray diffraction (XRD) and Raman spectroscopy analyses, while optical microscopy provided visual evidence regarding surface morphology changes throughout phase junction formation stages. Furthermore, we utilized a UV–visible spectrophotometer to quantify the bandgap and integrated this data with X-ray photoelectron spectroscopy (XPS) analysis of core level peaks and valence band spectra in order to construct an energy level structure for the β-Ga₂O₃/ε-Ga₂O₃ phase junction. Our findings demonstrate that this phase junction exhibits a type II energy band alignment, with measured valence and conduction band offsets of 0.54 eV and 0.41 eV respectively. This discovery holds significant implications for self-powered photodetectors utilizing gallium oxide as well as other potential applications.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.