scholarly journals Photodetectors: Low-Dimensional Structure Vacuum-Ultraviolet-Sensitive (λ < 200 nm) Photodetector with Fast-Response Speed Based on High-Quality AlN Micro/Nanowire (Adv. Mater. 26/2015)

2015 ◽  
Vol 27 (26) ◽  
pp. 3971-3971 ◽  
Author(s):  
Wei Zheng ◽  
Feng Huang ◽  
Ruisheng Zheng ◽  
Honglei Wu
Keyword(s):  
Vacuum Ultraviolet ◽  
Response Speed ◽  
Fast Response ◽  
Dimensional Structure ◽  
High Quality ◽  
Low Dimensional

scholarly journals Inch-sized high-quality perovskite single crystals by suppressing phase segregation for light-powered integrated circuits

2021 ◽  
Vol 7 (7) ◽  
pp. eabc8844
Author(s):  
Yucheng Liu ◽  
Yunxia Zhang ◽  
Xuejie Zhu ◽  
Zhou Yang ◽  
Weijun Ke ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Single Crystals ◽  
Integrated Circuit ◽  
High Performance ◽  
Imaging System ◽  
Phase Segregation ◽  
Response Speed ◽  
Fast Response ◽  
High Quality ◽  
Carrier Lifetimes

The triple-cation mixed-halide perovskite (FAxMAyCs1-x-y)Pb(IzBr1-z)3 (FAMACs) is the best composition for thin-film solar cells. Unfortunately, there is no effective method to prepare large single crystals (SCs) for more advanced applications. Here, we report an effective additive strategy to grow 2-inch-sized high-quality FAMACs SCs. It is found that the judiciously selected reductant [formic acid (FAH)] effectively minimizes iodide oxidation and cation deprotonation responsible for phase segregation. Consequently, the FAMACs SC shows more than fivefold enhancement in carrier lifetimes, high charge mobility, long carrier diffusion distance, as well as superior uniformity and long-term stability, making it possible for us to design high-performance self-powered integrated circuit photodetector. The device exhibits large responsivity, high photoconductive gain, excellent detectivity, and fast response speed; all values are among the highest reported to date for planar-type single-crystalline perovskite photodetectors. Furthermore, an integrated imaging system is fabricated on the basis of 12 × 12 pixelated matrixes of the single-crystal photodetectors.

Ultrasensitive photodetectors based on a high-quality LiInSe2 single crystal

2018 ◽  
Vol 6 (46) ◽  
pp. 12615-12622 ◽  
Author(s):  
Ning Jia ◽  
Shanpeng Wang ◽  
Pengfei Wang ◽  
Chunlong Li ◽  
TongTong Yu ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Stability ◽  
Response Speed ◽  
Fast Response ◽  
Research Interest ◽  
Future Research ◽  
High Quality ◽  
Current Ratio

An ultrasensitive photodetector based on high-quality LiInSe2 (LISe) was systemically investigated. The device exhibited a high on/off current ratio, high detectivity, fast response speed, and high stability. This work may lay the foundation and ignite future research interest on LISe in photodetection.

scholarly journals Fast Response GaAs Photodetector Based on Constructing Electron Transmission Channel

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1160
Author(s):  
Shuai Guo ◽  
Xue Chen ◽  
Dengkui Wang ◽  
Xuan Fang ◽  
Dan Fang ◽  
...  
Keyword(s):  
High Speed ◽  
Surface States ◽  
Response Speed ◽  
Fast Response ◽  
Transmission Channel ◽  
Electron Transmission ◽  
Speed Performance ◽  
Gaas Nanowire ◽  
Low Dimensional ◽  
Low Dimensional Materials

Low-dimensional GaAs photodetectors have drawn a great deal of attention because of their unique absorption properties and superior responsivity. However, their slow response speed caused by surface states presents challenges. In this paper, a mixed-dimensional GaAs photodetector is fabricated utilizing a single GaAs nanowire (NW) and a GaAs 2D non-layer sheet (2DNLS). The photodetector exhibits a fast response with a rise time of ~4.7 ms and decay time of ~6.1 ms. The high-speed performance is attributed to an electron transmission channel at the interface between the GaAs NW and GaAs 2DNLS. Furthermore, the fast electron channel is confirmed by eliminating interface states via wet passivation. This work puts forward an effective way to realize a high-speed photodetector by utilizing the surface states of low-dimensional materials.

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.

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

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.

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

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.

Low Temperature OMVPE of ZnSe from Alkyl Sources Using a Plasma Disk Lamp

1988 ◽  
Vol 129 ◽  
Author(s):  
K. L. Tokuda ◽  
B. Pihlstrom ◽  
D. W. Kisker ◽  
M. Lamont Schnoes ◽  
G. J. Collins
Keyword(s):  
Growth Process ◽  
Vacuum Ultraviolet ◽  
Source Material ◽  
Organometallic Vapor Phase Epitaxy ◽  
Impurity Incorporation ◽  
High Quality ◽  
Selenium Compound ◽  
Ultraviolet Photons ◽  
Reduced Toxicity ◽  
Source Materials

ABSTRACTThe growth of high quality ZnSe by organometallic vapor phase epitaxy (OMVPE) has generally been hindered because of parasitic source pre-reactions or relatively high source decomposition temperatures. In this work, we have used vacuum ultraviolet photons generated by a disk-plasma lamp to assist the ZnSe growth process using diethylselenium and diethylzinc as source materials. This approach has resulted in satisfactory growth rates and high material quality at temperatures as low as 250°C, without the limitations of prereaction typically observed when H2Se is used for the selenium source material. In addition, the alkyl selenium compound offers advantages due to reduced toxicity compared to H2Se. This new, low-growth-temperature process thus offers the possibility of improved stoichiometry and impurity incorporation control as well as a reduced thermal effect on the underlying substrate during growth. At the same time, the advantages of excellent morphology and uniformity typically exhibited by the alkylbased growth processes are retained.

Design of Missile Autopilot with Aerodynamic Lift and Reaction Jets Based on Auto Disturbance Rejection Controller

2012 ◽  
Vol 472-475 ◽  
pp. 1036-1039
Author(s):  
Chong Yang ◽  
Ke Zhang ◽  
Mei Bai Lu
Keyword(s):  
Disturbance Rejection ◽  
Response Speed ◽  
Fast Response ◽  
Urgent Problem ◽  
Robust Performance ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Lateral Pulse Jet ◽  
Aerodynamic Lift ◽  
Pulse Jet

First a new autopilot design model is presented for the interceptor missile with the blended aerodynamic lift and reaction jet. The reaction jet can improve the response speed, but the structure of control system becomes more complex. Therefore how to design control strategy properly is an urgent problem. Second, considering the discrete property of the lateral pulse jet thrusters and the continuous property of the aerodynamic fins, a kind of ADRC (active disturbance rejection control) autopilot system was designed for the aerodynamic lift/reaction jet missile. Finally, through a testing in the simulation of MATLAB, it is shown that, due to the sufficient utilization of the reaction jet, there is a significant improvement in the fast response and robust performance of the proposed controller. It is applicable to design the autopilot of aerodynamic lift and reaction jet blended missile.

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