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

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.

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

Nanotechnology ◽

10.1088/1361-6528/ac451f ◽

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.

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

Crystals ◽

10.3390/cryst11060648 ◽

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.

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Self-Powered All-Inorganic Perovskite Photodetectors with Fast Response Speed

Nanoscale Research Letters ◽

10.1186/s11671-020-03460-4 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Ting Zhang ◽

Shibin Li

Keyword(s):

High Performance ◽

Solution Process ◽

Response Speed ◽

Fast Response ◽

Single Step ◽

Inorganic Perovskite ◽

Perovskite Materials ◽

Photoactive Materials ◽

Self Powered ◽

Solvent Processing

AbstractIn this manuscript, the inorganic perovskite CsPbI2Br and CsPbIBr2 are investigated as photoactive materials that offer higher stability than the organometal trihalide perovskite materials. The fabrication methods allow anti-solvent processing the CsPbIxBr3−x films, overcoming the poor film quality that always occur in a single-step solution process. The introduced diethyl ether in spin-coating process is demonstrated to be successful, and the effects of the anti-solvent on film quality are studied. The devices fabricated using the methods achieve high-performance, self-powered and the stabilized photodetectors show fast response speed. The results illustrate a great potential of all-inorganic CsPbIxBr3−x perovskites in visible photodetection and provide an effective way to achieve high performance devices with self-powered capability.

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High performance self-powered CuZnS/GaN UV photodetectors with ultrahigh on/off ratio (3 × 108)

Journal of Materials Chemistry C ◽

10.1039/d1tc00137j ◽

2021 ◽

Vol 9 (14) ◽

pp. 4799-4807

Author(s):

Yong Zhang ◽

Weidong Song

Keyword(s):

Chemical Bath Deposition ◽

High Performance ◽

Response Speed ◽

Fast Response ◽

Uv Photodetector ◽

Uv Photodetectors ◽

Simple Chemical ◽

Self Powered

P-CuZnS/n-GaN UV photodetector is prepared by a simple chemical bath deposition, showing excellent self-powered properties, including ultrahigh on/off ratio (3 × 108), fast response speed (0.14/40 ms) and large detectivity of 3 × 1013 Jones.

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A Self-Powered Nanogenerator for the Electrical Protection of Integrated Circuits from Trace Amounts of Liquid

Nano-Micro Letters ◽

10.1007/s40820-019-0338-1 ◽

2019 ◽

Vol 12 (1) ◽

Cited By ~ 3

Author(s):

Zhuang Hui ◽

Ming Xiao ◽

Daozhi Shen ◽

Jiayun Feng ◽

Peng Peng ◽

...

Keyword(s):

Integrated Circuits ◽

High Performance ◽

Printed Circuit Board ◽

Short Circuit ◽

High Sensitivity ◽

Short Circuit Current ◽

Fast Response ◽

Open Circuit ◽

Circuit Board ◽

Self Powered

Abstract With the increase in the use of electronic devices in many different environments, a need has arisen for an easily implemented method for the rapid, sensitive detection of liquids in the vicinity of electronic components. In this work, a high-performance power generator that combines carbon nanoparticles and TiO2 nanowires has been fabricated by sequential electrophoretic deposition (EPD). The open-circuit voltage and short-circuit current of a single generator are found to exceed 0.7 V and 100 μA when 6 μL of water was applied. The generator is also found to have a stable and reproducible response to other liquids. An output voltage of 0.3 V was obtained after 244, 876, 931, and 184 μs, on exposure of the generator to 6 μL of water, ethanol, acetone, and methanol, respectively. The fast response time and high sensitivity to liquids show that the device has great potential for the detection of small quantities of liquid. In addition, the simple easily implemented sequential EPD method ensures the high mechanical strength of the device. This compact, reliable device provides a new method for the sensitive, rapid detection of extraneous liquids before they can impact the performance of electronic circuits, particularly those on printed circuit board.

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Two-dimensional SnS2 materials as high-performance NO2 sensors with fast response and high sensitivity

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2017.08.091 ◽

2018 ◽

Vol 255 ◽

pp. 616-621 ◽

Cited By ~ 34

Author(s):

Young-Ho Kim ◽

Duy-Thach Phan ◽

Seungbae Ahn ◽

Ki-Hun Nam ◽

Cheol-Min Park ◽

...

Keyword(s):

High Performance ◽

High Sensitivity ◽

Fast Response ◽

Two Dimensional

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High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽

10.1039/c4nr00277f ◽

2014 ◽

Vol 6 (12) ◽

pp. 6521-6525 ◽

Cited By ~ 7

Author(s):

Ming Zhuo ◽

Yuejiao Chen ◽

Tao Fu ◽

Haonan Zhang ◽

Zhi Xu ◽

...

Keyword(s):

High Performance ◽

Humidity Sensor ◽

High Sensitivity ◽

Fast Response ◽

Humidity Sensors ◽

Term Stability ◽

Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

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