scholarly journals Steady-state characteristics and transient response of MgZnO-based metal-semiconductor-metal solar-blind ultraviolet photodetector with three types of electrode structures

2013 ◽  
Vol 21 (15) ◽  
pp. 18387 ◽  
Author(s):  
Ping Wang ◽  
Qinghong Zhen ◽  
Qing Tang ◽  
Yintang Yang ◽  
Lixin Guo ◽  
...  
Keyword(s):  
Steady State ◽  
Transient Response ◽  
Ultraviolet Photodetector ◽  
Metal Semiconductor Metal ◽  
Solar Blind

Band-Edge Photoresponse Characteristics of Diamond Msm's

1993 ◽  
Vol 302 ◽  
Author(s):  
Mike Marchywka ◽  
Steven C. Binari ◽  
Deborah A. Koolbeck ◽  
Daniel Moses
Keyword(s):  
Steady State ◽  
Transient Response ◽  
Dark Current ◽  
Vacuum Ultraviolet ◽  
Light Signal ◽  
Band Edge ◽  
Metal Semiconductor Metal ◽  
Response Versus ◽  
Substrate Properties

ABSTRACTBand-edge photoresponse measurements on simple diamond metal-semiconductor-metal (MSM) devices can give information about the quality of the diamond material and its utility as a detector. We have fabricated several such devices on a variety of substrates and measured their response between 700 and 120nm with special emphasis around the band edge near 220nm. Steady state and transient response have been measured as a function of bias conditions. Transient response in this case refers to initial overshoot, undershoot, and increased dark current in response to a chopped vacuum ultraviolet (VUV) light signal for times on the order of seconds. We compare steady state quantum efficiency results to a simple model, discuss the characteristics of response versus applied voltage, and examine relationships between response and substrate properties.

Dark current suppression of MgZnO metal-semiconductor-metal solar-blind ultraviolet photodetector by asymmetric electrode structures

2014 ◽  
Vol 39 (2) ◽  
pp. 375 ◽  
Author(s):  
Ping Wang ◽  
Qinghong Zheng ◽  
Qing Tang ◽  
Yintang Yang ◽  
Lixin Guo ◽  
...  
Keyword(s):  
Dark Current ◽  
Ultraviolet Photodetector ◽  
Metal Semiconductor Metal ◽  
Solar Blind

Deep Ultraviolet Photodetector Based on Sulphur-Doped Cubic Boron Nitride Thin Film

2016 ◽  
Vol 879 ◽  
pp. 1117-1122 ◽  
Author(s):  
Yu Bo Li ◽  
Jian Wei Zhong ◽  
Li Ming Zhou ◽  
Chao Lun Sun ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Chemical Vapor ◽  
Wide Bandgap ◽  
Blind Detection ◽  
Ultraviolet Photodetector ◽  
Metal Semiconductor Metal ◽  
Solar Blind ◽  
Deep Ultraviolet ◽  
Uv Response

Cubic boron nitride (c-BN) is a wide bandgap III-V compound semiconductor potentially useful for solar-blind photodetectors. This paper describes work on the use of Sulphur doping to adjust the bandgap of c-BN films prepared by plasma-enhanced chemical vapor deposition (PECVD). An S-doped c-BN film based metal-semiconductor-metal (MSM) solar-blind ultraviolet (SBUV) photodetector was successfully fabricated and its electro-optical properties were characterized. The photocurrent shows peak responsivity at 254nm with sharp cutoff wavelengths at 220 and 300 nm, respectively, which is appropriate for use in solar-blind detection. The maximum response reached 1.55×10-7 A/W/cm2 with a rejection ratio of more than three orders of magnitude. The high solar-blind region UV response could be attributed to the successful substitution of boron by Sulphur and the suppression of B vacancies. The experimental results show the same peak in response at around 254nm as is found in the theoretical analysis.

Improved Load Sharing Control Techniques for Inverters used in a Microgrid

2009 ◽  
Vol 10 (1) ◽  
Author(s):  
Wei Yao ◽  
Zhaoming Qian
Keyword(s):  
Steady State ◽  
Transient Response ◽  
Single Phase ◽  
Load Sharing ◽  
Power Sharing ◽  
Experimental Results ◽  
Control Technique ◽  
Transient Performance ◽  
Control Techniques ◽  
Control Scheme

In this paper, an improved load sharing control scheme is presented, which is able to improve the transient response and power sharing accuracy of parallel-connected inverters used in microgrid. It also shows how the improved droop method can be easily adapted to account for the operation of parallel-connected inverters, providing good performance under the variation and disturbance of loads, as well as achieving good steady-state objectives and transient performance. Two DSP-based single-phase Microgrid inverters are designed and implemented. Simulation and experimental results are all reported, confirming the validity of the proposed control technique.

Steady-State and Transient Response of Selected All-Terrain Vehicles (ATVs)

1994 ◽  
Author(s):  
Graeme F. Fowler ◽  
Robert H. Fries ◽  
Roger L. McCarthy ◽  
Farshid A. Forouhar ◽  
Robert E. Larson
Keyword(s):  
Steady State ◽  
Transient Response

Solution-assembled nanowires for high performance flexible and transparent solar-blind photodetectors

2015 ◽  
Vol 3 (3) ◽  
pp. 596-600 ◽  
Author(s):  
Jiangxin Wang ◽  
Chaoyi Yan ◽  
Meng-Fang Lin ◽  
Kazuhito Tsukagoshi ◽  
Pooi See Lee
Keyword(s):  
High Performance ◽  
Switching Time ◽  
Ultraviolet Photodetector ◽  
Assembly Method ◽  
Solar Blind

An all-NW ultraviolet photodetector with high photoresponse and improved switching time was fabricated by a solution assembly method.

Application of a Fuzzy Logic Controller for Speed Control on a Small-Scale Turbojet Engine

2014 ◽  
Author(s):  
Serdar Üşenmez ◽  
Sinan Ekinci ◽  
Oğuz Uzol ◽  
İlkay Yavrucuk
Keyword(s):  
Fuzzy Logic ◽  
Steady State ◽  
Transient Response ◽  
Fuzzy Logic Controller ◽  
Electronic Control Unit ◽  
Small Scale ◽  
Gas Temperature ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Turbojet Engine

Having a small-scale turbojet engine operate at a desired speed with minimum steady state error, while maintaining good transient response is crucial in many applications, such as UAVs, and requires precise control of the fuel flow. In this paper, first the mathematical model of a Small-Scale Turbojet Engine (SSTE) is obtained using system identification tests, and then based on this model, a classical PI controller is designed. Afterwards, to improve on the transient response and steady state performance of this classical controller, a Fuzzy Logic Controller (FLC) is designed. The design process for the FLC employs logical deduction based on knowledge of the engine behavior and iterative tuning in the light of software- and hardware-in-the-loop simulations. The classical and fuzzy logic controllers are both implemented on an in-house, embedded Electronic Control Unit (ECU) running in real time. This ECU is an integrated device carrying a microcontroller based board, a fuel pump, fuel line valves, speed sensor and exhaust gas temperature sensor inputs, and starter motor and glow plug driver outputs. It mainly functions by receiving a speed reference value via its serial communication interface. Based on this reference, a voltage is calculated and applied to the fuel pump in order to regulate the fuel flow into the engine, thereby bringing the engine speed to the desired value. Pre-defined procedures for starting and stopping the engine are also automatically performed by the ECU. Further, it connects to a computer running an in-house comprehensive Graphical User Interface (GUI) software for operating, monitoring, configuration and diagnostics purposes. The designed controllers are used to drive a generic SSTE. Reference inputs consisting of step, ramp and chirp profiles are applied to the controllers. The engine response using both controllers are recorded and inspected. The results show that the FLC exhibits a comparable performance to the classical controller, with possible opportunities to improve this performance.

scholarly journals Solar-blind ultraviolet photodetector based on graphene/vertical Ga2O3 nanowire array heterojunction

Nanophotonics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 1557-1562 ◽  
Author(s):  
Tao He ◽  
Yukun Zhao ◽  
Xiaodong Zhang ◽  
Wenkui Lin ◽  
Kai Fu ◽  
...  
Keyword(s):  
Response Times ◽  
Nanowire Array ◽  
Graphene Film ◽  
Fast Response ◽  
Nanowire Arrays ◽  
Monolayer Graphene ◽  
Ultraviolet Photodetector ◽  
Solar Blind ◽  
Decay Times ◽  
First Time

AbstractIn this paper, a solar-blind ultraviolet photodetector (PD) based on the graphene/vertical Ga2O3 nanowire array heterojunction was proposed and demonstrated. To the best of our knowledge, it is the first time that vertical Ga2O3 nanowire arrays have been realized. Ga2O3 nanowires were obtained by thermally oxidizing GaN nanowires grown by molecular beam epitaxy on n-doped Si substrate. Then, a monolayer graphene film was transferred to Ga2O3 nanowires to form the graphene/vertical Ga2O3 nanowire array heterojunction and transparent electrodes. The fabricated device exhibited a responsivity (R) of 0.185 A/W and rejection ratio (R258 nm/R365 nm) of 3×104 at the bias of −5 V. Moreover, the fast response times of this PD were 9 and 8 ms for the rise and decay times under 254 nm illumination, respectively, which are attributed to the unique properties of nanowire arrays and the graphene/vertical Ga2O3 nanowire array heterojunction structure.

Performance of A Single Phosphorus-doped β-Ga2O3 Microwire Solar-blind Ultraviolet Photodetector

2021 ◽  
Vol 42 (11) ◽  
pp. 1653-1660
Author(s):  
Qiu-ju FENG ◽  
◽  
Jin-zhu XIE ◽  
Zeng-jie DONG ◽  
Chong GAO ◽  
...  
Keyword(s):  
Ultraviolet Photodetector ◽  
Solar Blind ◽  
Phosphorus Doped
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