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Charge carriers injection in tandem semiconductors for dyes mineralization

Paper ID Volume ID Publish Year Pages File Format Full-Text
45656 46418 2015 12 PDF Available
Title
Charge carriers injection in tandem semiconductors for dyes mineralization
Abstract

•Tandem band energy structures allow the generation and mobility of charge carriers.•Continuous interfaces is supported by the crystalline structures compatibility.•In the depletion layer a concentration gradient over the semiconductor is expected.•The three-component tandem samples exhibit fractal morphology.•In tandem the electrons are involved in reduction reactions with the photocatalyst.

Four mono-component and three tandem structures were prepared by robotic spray pyrolysis deposition using different precursor compositions and deposition temperatures. The structures of the electronic bands and the light generation/injection of the charge carriers trough the tandem layers (CuxS, CuO, SnO2, ZnO, TiO2) were studied using electrical (J–V, photocurrent) and optical (UV–vis transmittance) measurements. The crystalline structures and crystallite sizes were evaluated by X-ray diffraction and the morphologies were studied via atomic force microscopy. The wettability properties and the surface energy were calculated based on contact angle measurements using two liquids with different polarities (glycerol and ethylene glycol). The photocatalytic investigations show that the sample containing TiO2_CuO–CuxS_SnO2 has the highest photo-mineralization efficiency (78% removal of total organic carbon). It was found that copper sulfide compounds increase the photosensitivity properties of the tandem structure especially in vis region of the spectra. The efficiency and kinetics data of the photocatalytic processes were in agreement with the electronic bands alignment, which shows that tandem structures with suitable band energy values and at least one active interface allow high charge carrier mobility and the generation of oxidative species during photocatalysis.

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Keywords
Tandem structures; Interface control; Optoelectric properties; CuxS/MOx; Photocatalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 162, January 2015, Pages 352–363
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us