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It has been demonstrated that carbon nanotube field effect transistor (CNTFET) is a promising device to improve the performance of carbon nanotube (CNT) infrared (IR) sensors by modulating the doping level of the CNT channel. However, how to optimize the performance of the CNTFET based IR sensor is not well understood. In particularly, there was limited study on the design of transistor's gate structure,...
Carbon nanotube (CNT) is a novel one dimensional (1D) material that has unique electrical and optoelectronic properties. Photo-sensors using CNT can sense infrared signals by using Schottky barriers between metal and nanotube, which are able to separate photo-generated electron-hole pairs in order to generate photocurrent or photovoltage for detection and quantification. It has been demonstrated that...
Single wall carbon nanotube (SWCNT) is a promising one dimensional (1D) material to fabricate high performance infrared (IR) detectors owing to its unique electrical and physical properties. The 1D Schottky barrier between metal and CNT can separate the photon-generated electron-hole pairs so as to produce photocurrent for quantification and detection. However, the theory developed for the planar...
Carbon nanotube is a promising material to fabricate high-performance nanoscale-optoelectronic devices owing to its unique 1-D structure. In particular, different types of carbon-nanotube-infrared detectors have been developed. However, most previous reported carbon-nanotube-IR detectors showed poor device characteristics due to limited understanding of their working principles. In this paper, three...
One dimensional (1D) Schottky diodes between metals and carbon nanotubes (CNTs) can separate the photo-generated electron-hole (e-h) pairs in order to produce photocurrent in the CNT infrared (IR) sensors for detection and quantification. However, the traditional Schottky barrier theories developed for the metal and planar semiconductor contacts are different from the contacts between metal and CNT...
Hopping sensors are a type of low cost mobile sensors that are small in size, have limited capability and imprecise movement. However, their unique method of movement makes them suitable for rugged terrains. Sensors may fail when deployed in a rugged terrain or in an obstacle-abundant environment. Therefore, redundant sensors may be identified and relocated to the sensor holes. This paper addresses...
Carbon nanotube (CNT) Schottky barriers and p-n junctions based photovoltaic photodiodes have been demonstrated they were able to detect infrared (IR) signals. However, how to optimize the performances of these one dimensional (1D) detectors is not clear due to the variation of the properties of as-made CNTs. We investigated the photocurrent variation by modulating the depletion regions through electrostatic...
Carbon nanotube (CNT) based infrared (IR) detectors have been reported and shown promising properties taking advantage of its one dimensional structure and unique electrical properties. The CNT photodiodes detect IR signal through Schottky barriers that are formed when metal and semiconductor CNT come into contact due to the difference of the energy levels. However, the generated photocurrent was...
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