A alpha-Si: H Thin-Film Phototransistor for a Near-Infrared Touch Sensor

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This letter presents a highly sensitive near-infrared (IR) a -Si:H phototransistor for touch sensor applications. The narrow bandgap of a-Si exhibits a wideband spectrum response from IR to ultraviolet region, where the IR bandpass filter layers allow the a -Si:H phototransistor to respond to the selective IR light uninterrupted by visible light. The time-resolved photoresponse and transfer I V characteristics for the near-IR a -Si:H phototransistor as a function of power at 785-nm illumination allow the observation of fast photoresponse (tau similar to 0.1 ps), high external quantum efficiency (7.52), and high photoresponse. A prototype unit pixel structure for touch sensors composed of amorphous Si-based switching/amplification/near-IR phototransistors and a storage capacitor, is proposed and designed. The overall results suggest that the near-IR a -Si:H phototransistor offers unique possibilities for user-friendly, low-cost, and large-area touch sensors, especially aimed at consumer applications and other areas of optoelectronics.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

ARRAYS

Citation

IEEE ELECTRON DEVICE LETTERS, v.36, no.1, pp.41 - 43

ISSN
0741-3106
DOI
10.1109/LED.2014.2367118
URI
http://hdl.handle.net/10203/239972
Appears in Collection
ME-Journal Papers(저널논문)
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