Augmented Photoelectrochemical Efficiency of ZnO/TiO2 Nanotube Heterostructures

被引：7

作者：

Boda, Muzaffar Ahmad ^{[1
]}

Shah, Mohammad Ashraf ^{[1
]}

机构：

[1] Natl Inst Technol Srinagar, PG Dept Phys, Special Ctr Nanosci, Srinagar 190006, Jammu & Kashmir, India

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2017年 / 46卷 / 11期

关键词：

Nanotube heterostructures; electron mobility; band bending; photocurrent; SENSITIZED SOLAR-CELLS; THIN-FILM TRANSISTORS; PHOTOCATALYTIC ACTIVITIES; WO3/TIO2; FILMS; ARRAYS; ZNO; FABRICATION; ROUTE; SEMICONDUCTORS; ELECTRODES;

D O I：

10.1007/s11664-017-5710-7

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

ZnO/TiO2 nanotube heterostructures have been fabricated by electrodeposition of ZnO microcrystals over electrochemically anodized TiO2 nanotube arrays. The resulting ZnO/TiO2 nanotube heterostructures showed enhanced photocurrent density of 5.72 mA cm(-2), about 1.5 times the value of 3.68 mA cm(-2) shown by bare compact TiO2 nanotubes. This enhanced photocurrent density of the ZnO/TiO2 nanotube heterostructures is due to high electron mobility in the ZnO crystals, thereby decreasing the electron-hole recombination process, good interfacial quality between the ZnO and TiO2 structures, and a proposed smooth charge-transfer mechanism due to band bending at the interface. The morphological features of the as-prepared heterostructures were determined by field-emission scanning electron microscopy (FESEM). The crystallinity and phase purity of the samples were confirmed by x-ray diffraction (XRD) analysis. The light absorption properties of the prepared samples were investigated by ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The photoelectrochemical efficiency of bare and ZnO-modified TiO2 nanotube heterostructures was determined by electrochemical analyzer.

引用

页码：6698 / 6703

页数：6

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