Photoconductivity of Single-crystalline Selenium Nanotubes

Photoconductivity of single-crystalline selenium nanotubes (SCSNT) under a range of illumination intensities of a 633nm laser is carried out with a novel two terminal device arrangement at room temperature. It's found that SCSNT forms Schottky barriers with the W and Au contacts, and the barrie...

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Bibliographic Details
Published in:arXiv.org 2007-02
Main Authors: Liu, Peng, Ma, Yurong, Cai, Weiwei, Wang, Zhenzhong, Qi, Limin, Chen, Dongmin
Format: Article
Language:English
Subjects:
Crystal structure
Crystallinity
Hybrid structures
Illumination
Light
Luminous intensity
Nanotubes
Photoconductivity
Photovoltaic cells
Resistance
Selenium
Single crystals
Solar cells
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Summary:Photoconductivity of single-crystalline selenium nanotubes (SCSNT) under a range of illumination intensities of a 633nm laser is carried out with a novel two terminal device arrangement at room temperature. It's found that SCSNT forms Schottky barriers with the W and Au contacts, and the barrier height is a function of the light intensities. In low illumination regime below 1.46x10E-4 muWmum-2, the Au-Se-W hybrid structure exhibits sharp switch on/off behavior, and the turn-on voltages decrease with increasing illuminating intensities. In the high illumination regime above 7x10E-4 muWmum-2, the device exhibits ohmic conductance with a photoconductivity as high as 0.59Ohmcm-1, significantly higher that reported values for carbon and GaN nanotubes. This finding suggests that SCSNT is potentially a good photo-sensor material as well we a very effective solar cell material.
ISSN:2331-8422
DOI:10.48550/arxiv.0702088