Enhanced ultraviolet photoresponse based on ZnO nanocrystals/Pt bilayer nanostructure

doi:10.1088/1674-1056/24/6/067306

Abstract The development of solution strategies for Zinc oxide (ZnO) quantum dots provides a pathway to utilizing ZnO nanocrystal thin films in optoelectronic devices. In this work, quasi-spherical ZnO quantum dots with a diameter of 5 nm are synthesized by using ethanol as a solvent. ZnO nanocrystal thin film is obtained by spin-coating ZnO quantum dots on a Au interdigital electrode (IDE)/Al₂O₃ substrate and annealing at different temperatures in order to yield the optimal photosensitive on/off ratio of ZnO. For further enhancing the responsivity, ion sputtering is utilized to deposit Pt nanoparticles on the surface of ZnO nanocrystal thin film, the responsivity of the ZnO/Pt bilayer nanostructure increases from 0.07 A/W to 54 A/W, showing that the metal/inorganic nanocrystal bilayer nanostructure can be used to improve the performance of optoelectronic devices. The excellent properties of ZnO/Pt bilayer nanostructure have important applications in future electronic and optoelectronic devices.

Keywords: zinc oxide nanocrystals photoresponse ion sputtering plasma treatment

Received: 26 August 2014
Revised: 26 January 2015
Accepted manuscript online:

PACS:	73.63.Bd	(Nanocrystalline materials)
	85.30.De	(Semiconductor-device characterization, design, and modeling)
	68.55.-a	(Thin film structure and morphology)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 41176156).

Corresponding Authors: Li Qing-Xia
E-mail: qingxia_li@hust.edu.cn

About author: 73.63.Bd; 85.30.De; 68.55.-a

Cite this article:

Tong Xiao-Lin (佟晓林), Xia Xiao-Zhi (夏晓智), Li Qing-Xia (李青侠) Enhanced ultraviolet photoresponse based on ZnO nanocrystals/Pt bilayer nanostructure 2015 Chin. Phys. B 24 067306

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Enhanced ultraviolet photoresponse based on ZnO nanocrystals/Pt bilayer nanostructure

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