Photoconductivity of single-crystalline selenium nanotubes
- Liu, Peng
- Ma, Yurong
- Cai, Weiwei
- Wang, Zhenzhong
- Wang, Jian
- Qi, Limin
- Chen, Dongmin
DOIAbstract
The photoconductivity of single-crystalline selenium nanotubes ( SCSNTs) under a range of illumination intensities of a 633 nm laser is examined using a novel two-terminal device arrangement at room temperature. It is found that SCSNTs forms Schottky barriers with W and Au contacts, and the barrier height is a function of the light intensity. In the low-illumination regime below 1.46 x 10(-4) mu W mu m(-2), the Au-Se-W hybrid structure exhibits sharp on/off switching behaviour, and the turn-on voltages decrease with increasing illuminating intensities. In the high-illumination regime above 7 x 10- 4 mu W mu m(-2), the device exhibits ohmic conductance with a photoconductivity as high as 0.59 ohm cm(-1), which is significantly higher than th...
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