Structural, optical and electrochemical transient photoresponse properties of ZnO/Ga2O3 nanocomposites prepared by two-step CVD method

被引：19

作者：

Jubu, P. R. ^{[1
,2
]}

Yam, F. K. ^{[1
]}

Kyesmen, Pannan, I ^{[3
]}

机构：

[1] Univ Sains Malaysia USM, Sch Phys, George Town 11800, Malaysia

[2] Univ Agr, Dept Phys, PMB 2373, Makurdi, Benue State, Nigeria

[3] Univ Pretoria, Dept Phys, Private Bag X20, ZA-0028 Hatfield, South Africa

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 66期

关键词：

Gallium oxide; Nanocomposites: chemical vapor deposition; Optical properties: photocatalysis; ATOMIC LAYER DEPOSITION; TEMPERATURE; ARRAYS; FABRICATION; NANORODS; GROWTH; FILMS;

D O I：

10.1016/j.ijhydene.2021.07.165

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of ZnO layer thickness on the structural, optical and electrochemical transient photoresponse properties of Ga2O3/ZnO heterostructured nanocomposites is evaluated. The increasing thickness of ZnO layer from 0 to 7.868 mu m on the nanocomposites show an increase in the concentration of photogenerated electron-hole pairs, improve carrier separation and transportation to the electrolyte. This results to an enhanced photocurrent density from 164 to 833 mu A/cm(2) at 1 V vs Ag/AgCl electrode. The unhybridized beta-Ga2O3 film and the ZnO/Ga2O3 nanocomposites exhibit nanoblock-like and nanoplate-like morphologies, respectively. Structural studies reveal hexagonal ZnO and beta-Ga2O3 crystalline phases for the nanocomposites. Optical bandgap of the reference beta-Ga2O3 film is found to be 4.79 eV whereas, the nanocomposites exhibit two bandgaps: 3.30-3.25 eV belonging to the crystalline hexagonal ZnO phase, and 4.87-4.83 eV traced to the beta-Ga2O3 phase. Photoluminescence spectroscopy exhibits blue-green emissions for the unhybridized film and ultraviolet-green emissions for the nanocomposites. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：33087 / 33097

页数：11

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