Optoelectronic Characteristics of UV Photodetector Based on ZnO Nanopillar Thin Films Prepared by Sol-Gel Method

Abstract

ZnO thin films were prepared on a quartz substrate by sol-gel method and a UV photodetector was constructed on the ZnO thin films, with a circular spiral structure in contact with 30 nm IrO 2 electrodes. The ZnO thin films were crystallized at various crystallized temperature (600$700 C) for 1 hour in pure oxygen atmosphere, and were then analyzed by X-ray diffraction (XRD) and the scanning electron microscopy (SEM) to investigate the thin film crystallized structures. From photoluminescence (PL) and I-V measurement, the 650 C thin film not only possessed a better crystallization but also had nanopillar structures that revealed an excellent characteristic of UV photodetector.

Fabrication and experimental characterization of a sol–gel derived nanostructured n-ZnO/p-Si heterojunction diode

“…The as-deposited sol-gel-spin-coat derived ZnO nanostructures have been extensively used for making electronic and optoelectronic devices. Chen et al [10] have reported contrast ratio as nearly 100 at 5 V bias voltage for their ZnO nano-pillar based Schottky contact photodetector fabricated by sol-gel spin coating technique. Yakuphanoglu et al [11] have fabricated and characterized ZnO nanostructure/Si heterojunction for photodetection and photovoltaic applications.…”

“…These nanostructure-based devices have found wide spread applications in solar cells, gas sensors, memory devices, and ultraviolet photodetectors [7][8][9][10][11][12]. ZnO-based ultraviolet photodetectors have potential advantages that include its strong UV-response, feasibility of simple and low cost processing, and chemical stability even in adverse environment [9][10][11]. Researchers have reportedly used a variety of techniques for growing ZnO nanostructures for fabrication of Schottky contact, MSM, MISIM, heterojunction diodes.…”

“…ZnO can easily form a wide range of nanostructures with unique electrical and optical properties, depending on the experimental conditions, such as type of substrate, deposition method, type of seed layer, deposition temperature and deposition conditions [1,[4][5][6]. These nanostructure-based devices have found wide spread applications in solar cells, gas sensors, memory devices, and ultraviolet photodetectors [7][8][9][10][11][12]. ZnO-based ultraviolet photodetectors have potential advantages that include its strong UV-response, feasibility of simple and low cost processing, and chemical stability even in adverse environment [9][10][11].…”

Density-Controlled Freestanding Biodegradable Nanopillar Arrays Patterned via Block Copolymer Micelle Lithography

“…Vertically aligned nanostructures on substrates have received increasing attention because of their applications in superhydrophobic surfaces, optoelectronic devices, and chemical‐ or bio‐sensing devices . After revealing that nanostructured vertical arrays could affect cellular response and enhance drug permeation across the cell membrane, nanopillar arrays on substrates have been extensively investigated on cellular studies and intracellular drug delivery .…”

Study of Structural and Optical Properties of ZnO Thin Films Produced by Sol–Gel Methods

“…Currently, ZnO thin films can be fabricated using spray pyrolysis, (1) metal organic chemical vapor deposition, (2,3) electron beam evaporation, (4) radio frequency sputtering, (5)(6)(7)(8)(9) thermal oxidation, (10) pulsed laser deposition, (11) molecular beam epitaxy, (12,13) and sol-gel (14)(15)(16) methods. Among these methods, the sol-gel method uses a nonvacuum coating process that features the advantages of simple fabrication and low equipment cost and thus exhibits extremely high market application potential.…”