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Heterojunction semiconductors: A strategy to develop efficient photocatalytic materials for visible light water splitting

Paper ID Volume ID Publish Year Pages File Format Full-Text
55536 47056 2012 8 PDF Available
Title
Heterojunction semiconductors: A strategy to develop efficient photocatalytic materials for visible light water splitting
Abstract

Heterojunction semiconductors are discussed as a strategy to develop efficient visible light photocatalysts for water splitting. The concept has been demonstrated in photovoltaic cells and optoelectronic devices, for which junction-type semiconductors show greatly enhanced efficiency compared to the devices consisting of a single semiconductor. We applied this proven concept to fabricate photocatalysts of inorganic semiconductors. Thus heterojunction structures of Shottky junctions, p–n junctions (or p–n diode), p–n junctions with Ohmic layer, and bulk heterojunctions were fabricated and their photoactivity was tested for reduction or oxidation of water under visible light. The formation of heterojunctions results in the efficient separation of electron–hole pairs to minimize the energy-wasteful electron–hole recombination, which leads to the high photocatalytic activity. As the complexity and sophistication of the photocatalyst fabrication increased, the photoactivity also increased. Modern nanomaterial synthetic techniques were employed to bring into reality the highly engineered material configurations.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (209 K)Download as PowerPoint slideHighlights► Heterojucntion semiconductors for efficient water splitting photocatalysts. ► Shottky junctions, p–n junctions, p–n junctions with Ohmic layer, and bulk heterojunctions are discussed. ► The formation of heterojunctions results in the efficient separation of electron–hole pairs to minimize the energy-wasteful electron–hole recombination.

Keywords
Heterojunction; Photocatalysts; Water splitting; Recombination
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Heterojunction semiconductors: A strategy to develop efficient photocatalytic materials for visible light water splitting
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 270–277
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
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