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Electrochemical Self-Assembly Of Metal Oxide Materials And The Study Of Their Composites And Optoelectronic Devices

Posted on:2005-04-08Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y L LiuFull Text:PDF
GTID:1118360152475004Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
ZnO is a wide band-gap semiconductor (3.37 eV at room temperature) with the high exciton binding energy of 60 meV. This material has attracted extensive interest in the field of electrical and optical devices because of its multi-functionality.Electrochemical assembly is a simple and convenient method, has been extensively used in the synthesis of many different types of materials. It has several advantages such as low processing temperature, higher deposition rates, controllable film thickness and morphology.This paper was focused on the growth of ZnO and its composite materials, studying their physical properties, such as the structural, optical and electrical properties. There are four main parts of this paper, which can be summarized as follows:ZnO films and nanoparticles have been successfully grown by the method of electrochemical assembly from aqueous zinc solution and nonaqueous zinc solution. Nano sized ZnO particles can be fabricated from nonaqueous zinc solution at room temperature.Nonionic polymer poly(vinylpyrrolidone) (PVP) was firstly mixed into oxygenated zinc chloride electrolyte to modulate the crystal growth and morphology of ZnO from electrodeposition. Arrays of uniform ZnO hexagonal nanorods with well-defined(0001) end facets and {10(1|-)0} side facets were grown perpendicularly onto p-type Si substrates using the simple and economic route. Te well-faced nature of these prisms with two naturally faceted ends provide a well-defined resonance cavity for stimulated emission, which is significant for the realization of laser action.ZnO nanoparticles were electrodeposited on porous silicon (PS) templates with different porosities. The photoluminescence spectra of the samples before and afterthe deposition of ZnO were measured. The I -V characteristics were obviously enhanced and showed good rectifying characteristics.A Cu2O/ZnO p-n heteroj unction was fabricated by electrochemical deposition method. The electrical properties of the/>-Cu2O/n-ZnO heteroj unction were studied using the current-voltage measurements. A distinct junction characteristic was observed.
Keywords/Search Tags:ZnO, nanorods, Electrochemical Assembly, Nanomaterial Composite, p-n Heterojunction
PDF Full Text Request
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