Abstract
The photoconductivity of single-crystalline selenium nanotubes (SCSNTs)under a range of illumination intensities of a 633 nm laser is examined using anovel two-terminal device arrangement at room temperature. It is found thatSCSNTs forms Schottky barriers with W and Au contacts, and the barrierheight is a function of the light intensity. In the low-illumination regime below1.46 × 10−4 µW µm−2, the Au–Se–W hybrid structure exhibits sharp on/off switching behaviour, and the turn-onvoltages decrease with increasing illuminating intensities. In the high-illumination regime above7 × 10−4 µW µm−2, the device exhibits ohmic conductance with a photoconductivity as high as0.59 Ω cm−1, which is significantly higher than the reported values for carbon and GaN nanotubes.This finding suggests that a SCSNT is potentially a good photo-sensor material as well as avery effective solar cell material.
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