Charge-transport interfacial modification enhanced ultraviolet (UV)/near-UV phototransistor with high sensitivity and fast response speed

2015 ◽  
Vol 210 ◽  
pp. 230-235 ◽  
Author(s):  
Xiao Luo ◽  
Lili Du ◽  
Wenli Lv ◽  
Lei Sun ◽  
Yao li ◽  
...  
Keyword(s):  
Charge Transport ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Interfacial Modification

scholarly journals Tin Disulfide-Coated Microfiber for Humidity Sensing with Fast Response and High Sensitivity

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 648
Author(s):  
Aijie Liang ◽  
Jingyuan Ming ◽  
Wenguo Zhu ◽  
Heyuan Guan ◽  
Xinyang Han ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Small Diameter ◽  
High Sensitivity ◽  
Large Change ◽  
Small Variation ◽  
Response Speed ◽  
Fast Response ◽  
Tin Disulfide ◽  
Recovery Times ◽  
Response And Recovery

Breath monitoring is significant in assessing human body conditions, such as cardiac and pulmonary symptoms. Optical fiber-based sensors have attracted much attention since they are immune to electromagnetic radiation, thus are safe for patients. Here, a microfiber (MF) humidity sensor is fabricated by coating tin disulfide (SnS2) nanosheets onto the surface of MF. The small diameter (~8 μm) and the long length (~5 mm) of the MF promise strong interaction between guiding light and SnS2. Thus, a small variation in the relative humidity (RH) will lead to a large change in optical transmitted power. A high RH sensitivity of 0.57 dB/%RH is therefore achieved. The response and recovery times are estimated to be 0.08 and 0.28 s, respectively. The high sensitivity and fast response speed enable our SnS2-MF sensor to monitor human breath in real time.

Microfabrication of Thermoelectric Hydrogen Sensor Using KOH Solution Etching

2006 ◽  
Vol 301 ◽  
pp. 273-276 ◽  
Author(s):  
Kazuki Tajima ◽  
Yeong Soo Choi ◽  
Woosuck Shin ◽  
Noriya Izu ◽  
Ichiro Matsubara ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Hydrogen Oxidation ◽  
Exothermic Reaction ◽  
High Sensitivity ◽  
Response Speed ◽  
Hydrogen Sensor ◽  
Fast Response ◽  
Sensor Technology ◽  
Circuit Fabrication ◽  
Voltage Signal

Micromachined sensors are a new generation of sensor technology combining existing integrated circuit fabrication technology with novel deposition and etching processing. In the viewpoint of low-power operation, high sensitivity and fast response speed of thermoelectric hydrogen sensor (THS), we prepared the micromachined thermoelectric hydrogen sensor (micro-THS) with the combination of the thermoelectric effect of SiGe thin film and the Pt-catalyzed exothermic reaction of hydrogen oxidation. The power consumption of the micro-THS was greatly reduced to be 50 mW for 100 °C operating, by the Pt-micro-heater on single membrane. The micro-THS with 40 wt.% Pt/alumina catalyst showed voltage signal of 10 mV for 1 % H2 in air.

A graphene/GaAs near-infrared photodetector enabled by interfacial passivation with fast response and high sensitivity

2015 ◽  
Vol 3 (18) ◽  
pp. 4723-4728 ◽  
Author(s):  
Lin-Bao Luo ◽  
Han Hu ◽  
Xian-He Wang ◽  
Rui Lu ◽  
Yi-Feng Zou ◽  
...  
Keyword(s):  
Near Infrared ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Device Performance ◽  
Infrared Photodetector

We report on a simple passivation strategy to improve the device performance of a near infrared (NIR) photodetector. Optoelectronic analysis reveals that after ultrathin AlOxpassivation, the device exhibits an obvious increase in on/off ratio. What is more, the response speed of the device was improved by more than 100 times, from 48 μs to 380 ns.

scholarly journals A Strategy for High-Performance Photodetector based on Graphene-Si heterostructure

2020 ◽  
Vol 213 ◽  
pp. 02014
Author(s):  
Tianying He ◽  
Changyong Lan ◽  
Chun Li ◽  
Sihan Zhou ◽  
Yi Yin
Keyword(s):  
High Performance ◽  
Collection Efficiency ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Van Der Waals Heterostructure ◽  
Mapping Technology ◽  
Peak Sensitivity ◽  
Heterostructure Devices

Van der Waals heterostructure shows promising applications in next generation optoelectronics. As a kind of van der Waals heterostructure, graphene/silicon (Gr/Si) based heterostructure devices have been demonstrated as high performance photodetectors. Here, we studied the origin of the high performance of Gr/Si photodetectors based on photocurrent mapping technology. According to photocurrent mapping, the photocurrent in the Gr/Si and Gr/SiO2/Si area nearing the Si window edge is higher than that in other positions, which is attributed to the highly effective collection efficiency of photocarriers. A device with size of Gr/Si region (r=7.4 μm) and Gr/SiO2/Si region (L=6.1 μm) shows high sensitivity and a broadband photoresponse in the range from 420 to 1000 nm with the peak sensitivity of 52 A/W at 780 nm, and fast response speed with rise time of 16 μs and decay time of 52 μs. Our study provides a strategy for the design of high photoresponsivity Gr/Si based devices.

scholarly journals Theoretical Study on Characteristics of Glow Discharged Neon Gas and Its Interaction With Terahertz Waves

2021 ◽  
Vol 9 ◽  
Author(s):  
Lei Hou ◽  
Yaodong Wang ◽  
Junnan Wang ◽  
Lei Yang ◽  
Wei Shi
Keyword(s):  
Room Temperature ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Terahertz Waves ◽  
Thz Wave ◽  
Wave Detector ◽  
Discharge Model ◽  
Neon Glow Discharge ◽  
Thz Waves

Discharge gases have been used to detect terahertz (THz) waves, however, there are few relevant theoretical studies. The neon glow discharge model is established by COMSOL Multiphysics software, the characteristics of glow discharged neon and the interaction of the discharged gas with THz waves were investigated. The results show that with the increase of THz wave’s frequency, the transmittance increases, the change of plasma discharge characteristics caused by THz wave can be used for THz wave detection. The results provide a theoretical basis for the development of cheap, room temperature THz wave detector with fast response speed, and high sensitivity.

Small-diameter p-type SnS nanowire photodetectors and phototransistors with low-noise and high-performance

2021 ◽  
Author(s):  
Ruoling Chen ◽  
Long Li ◽  
Long Jiang ◽  
Xiangxiang Yu ◽  
Desheng Zhu ◽  
...  
Keyword(s):  
Low Power ◽  
Dark Current ◽  
High Performance ◽  
Wide Spectrum ◽  
Small Diameter ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Low Noise ◽  
P Type

Abstract P-type nanostructured photodetectors and phototransistors have been widely used in the field of photodetection due to their excellent electrical and optoelectronic characteristics. However, the large dark current of p-type photodetectors will limit the detectivity. Herein, we synthesized small-diameter single-crystalline p-type SnS nanowires (NWs) and then fabricated single SnS NW photodetectors and phototransistors. The device exhibits low noise and low dark current, and its noise current power is as low as 2.4 × 10−28 A2. Under 830 nm illumination and low power density of 0.12 mW cm2, the photoconductive gain, responsivity and detectivity of the photodetector are as high as 3.9 × 102, 2.6 × 102 A W−1 and 1.8 × 1013 Jones, respectively, at zero gate voltage. The rise and fall time of response are about 9.6 and 14 ms. The experimental results show that the small-diameter p-type SnS NWs have broad application prospects in high-performance and low-power photodetectors with high sensitivity, fast response speed and wide spectrum detection in the future.

Broadband photodetector based on vertically stage-liked MoS2/Si heterostructure with ultra-high sensitivity and fast response speed

2020 ◽  
Vol 176 ◽  
pp. 1-6 ◽  
Author(s):  
Junxiong Guo ◽  
Shangdong Li ◽  
Yizhen Ke ◽  
Zhicheng Lei ◽  
Yu Liu ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Response Speed ◽  
Fast Response

Design and Fabrication of High Vacuum Gauge Based on Micro Hotplate

2015 ◽  
Vol 645-646 ◽  
pp. 698-705 ◽  
Author(s):  
Feng Tian Zhang ◽  
Ying Bin Zheng ◽  
Bin Tang ◽  
Wei Su ◽  
Zhen’an Tang
Keyword(s):  
Heat Conduction ◽  
Heat Dissipation ◽  
High Vacuum ◽  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Measurement Range ◽  
Heat Radiation ◽  
Vacuum System ◽  
Vacuum Gauge

Vacuum gauge based on micro hotplate (MHP) is a kind of promising MEMS vacuum gauge due to its advantages including high sensitivity, wide measurement range, fast response speed and comparably easy fabrication, etc. In this paper, through analyzing various of heat dissipation approaches including solid heat conduction, gas heat conduction, heat radiation, and convection, the sensor output expression of MHP-based vacuum gauge is obtained when keeping electric current of heating resistor constant. With the structure size and material properties, the relationship curve between vacuum gauge output and gas pressure can be obtained. By wet etching silicon under the compound dielectric films with embedded metal film resistor, MHP suspended over silicon substrate is fabricated. Then the sensor chip is assembled and put into vacuum system, and test is conducted when keeping the heating resistor at constant heating current of 5mA. The measurement results show that the sensor measurement range is 5×10-3Pa~103Pa, which is basically consistent with the theoretical analyzing results.

Electrochemical NOx Sensors for Automotive Diesel Exhaust

2002 ◽  
Vol 756 ◽  
Author(s):  
Louis P. Martin ◽  
Ai-Q. Pham ◽  
Robert S. Glass
Keyword(s):  
High Sensitivity ◽  
Response Speed ◽  
Fast Response ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Monitoring And Control ◽  
Stabilized Zirconia ◽  
Exact Role ◽  
And Control

ABSTRACTNew emissions regulations will increase the need for compact, inexpensive sensors for monitoring and control of automotive exhaust gas pollutants. Species of interest include hydrocarbons, carbon monoxide, and oxides of nitrogen (NOx). The current work is directed towards the development of fast, high sensitivity electrochemical NOx sensors for automotive diesel applications. We have investigated potentiometric NO sensors with good sensitivity and fast response when operated in 10% O2. The sensors consist of yttria-stabilized zirconia substrates attached with NiCr2O4 sensing electrodes and Pt reference electrodes. A composite NiCr2O4:Rh sensing electrode is shown to give significantly faster response than NiCr2O4 alone. The exact role of the Rh in enhancing the response speed is not clear at present. However, the Rh appears to accumulate at the contacts between the NiCr2O4 particles and may enhance the inter-particle electronic conduction. Ongoing testing of these sensors is being performed to elucidate the sensing mechanisms and to quantify cross sensitivity to, for example, NO2.

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