| A nanocomposite ultraviolet photodetector based on interfacial trap-controlled charge injection. | |
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MedLine Citation:
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PMID: 23142945 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Ultraviolet photodetectors have applications in fields such as medicine, communications and defence, and are typically made from single-crystalline silicon, silicon carbide or gallium nitride p-n junction photodiodes. However, such inorganic photodetectors are unsuitable for certain applications because of their high cost and low responsivity (<0.2 A W(-1)). Solution-processed photodetectors based on organic materials and/or nanomaterials could be significantly cheaper to manufacture, but their performance so far has been limited. Here, we show that a solution-processed ultraviolet photodetector with a nanocomposite active layer composed of ZnO nanoparticles blended with semiconducting polymers can significantly outperform inorganic photodetectors. As a result of interfacial trap-controlled charge injection, the photodetector transitions from a photodiode with a rectifying Schottky contact in the dark, to a photoconductor with an ohmic contact under illumination, and therefore combines the low dark current of a photodiode and the high responsivity of a photoconductor (∼721-1,001 A W(-1)). Under a bias of <10 V, our device provides a detectivity of 3.4 × 10(15) Jones at 360 nm at room temperature, which is two to three orders of magnitude higher than that of existing inorganic semiconductor ultraviolet photodetectors. |
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Authors:
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Fawen Guo; Bin Yang; Yongbo Yuan; Zhengguo Xiao; Qingfeng Dong; Yu Bi; Jinsong Huang |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-11 |
Journal Detail:
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Title: Nature nanotechnology Volume: - ISSN: 1748-3395 ISO Abbreviation: Nat Nanotechnol Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101283273 Medline TA: Nat Nanotechnol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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