Browsing by Author "Yang, Man-Chun"

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Ultrahigh Sensitivity Self-Amplification Phototransistor Achieved by Automatic Energy Band Lowering Behavior
(2014-09-01)
Chen, Hua-Mao
;
Chang, Ting-Chang
;
Tai, Ya-Hsiang
;
Chen, Yu-Chun
;
Yang, Man-Chun
In this paper, amorphous InGaZnO4 thin-film transistors with an asymmetric structure exhibit ultraviolet (UV) light sensing property. At the offset region near the drain electrode, the extended active layer plays the role of a resistor. However, the ON-state current is obviously reduced with increasing offset length at the offset region near the source electrode and the characteristics cannot be turned ON when offset length is over 4 mu m. After exposure to UV light, photogenerated holes-induce source barrier lowering and then amplifying the photocurrent response. Therefore, the devices in this paper reach a high-ON/OFF ratio of UV sensitivity to 10(6).