Solar-Blind AlGaN-based Schottky Photodiodes With High Detectivity and Low Noise

2002 ◽  
Vol 743 ◽  
Author(s):  
Necmi Biyikli ◽  
Orhan Aytur ◽  
Ibrahim Kimukin ◽  
Turgut Tut ◽  
Ekmel Ozbay
Keyword(s):  
Power Density ◽  
Dark Current ◽  
Reverse Bias ◽  
Low Noise ◽  
Noise Power ◽  
Cutoff Wavelength ◽  
Solar Blind ◽  
Fabrication And Characterization ◽  
Noise Power Density

AbstractWe report on the design, fabrication and characterization of solar-blind Schottky photodiodes with high detectivity and low noise. The devices were fabricated on n-/n+ AlGaN/GaN hetero-structures using a microwave compatible fabrication process. Using Al0.38Ga0.62N absorption layer, true solar-blind operation with a cutoff wavelength of ∼274 nm was achieved. The solar-blind detectors exhibited < 400 fA dark current in the 0–25 V reverse bias regime, and a maximum responsivity of 89 mA/W around 267 nm. The photovoltaic detectivity of the devices were in excess of 2.6×1012 cmHz1/2/W, and the detector noise was 1/f limited with a noise power density less than 3×10−29 A2/Hz at 10 KHz.

scholarly journals Investigation influence of switching tests coatings of magnetically controlled contacts on the surface structure

2021 ◽  
Vol 2103 (1) ◽  
pp. 012232
Author(s):  
D S Loginov ◽  
A V Baskakova ◽  
V G Litvinov ◽  
T A Kholomina ◽  
N B Rybin ◽  
...  
Keyword(s):  
Surface Structure ◽  
Power Density ◽  
Noise Power ◽  
Density Measurements ◽  
Noise Parameters ◽  
Noise Power Density ◽  
Spectral Noise Power Density

Abstract The results of spectral noise power density measurements of reed switches 10 samples with and without Au-Ru coating are analyzed. The dependences of the spots area formed during switching tests on the electrodes on various noise parameters are constructed.

A NEW TECHNIQUE FOR THE STUDY OF SCATTER PROPAGATION IN THE TROPOSPHERE

1957 ◽  
Vol 35 (8) ◽  
pp. 823-830 ◽  
Author(s):  
J. H. Chapman ◽  
W. J. Heikkila ◽  
J. E. Hogarth
Keyword(s):  
Power Spectrum ◽  
Communication System ◽  
Carrier Frequency ◽  
Signal To Noise Ratio ◽  
Signal Strength ◽  
Noise Power ◽  
Signal To Noise ◽  
A New Technique ◽  
Conventional Signal ◽  
Noise Power Density

The power spectrum of the fluctuations in received signal strength on a near-optical U.H.F. circuit has been measured. The sidebands associated with these fluctuations can overlap the information-carrying sidebands of a communication system. When this happens, these sidebands must be taken into account in determining the signal-to-noise ratio of the system. In other words, the fluctuations then have the characteristics of noise, and therefore they are called propagation noise in the present paper. Experiments at a carrier frequency of 500 Mc. have shown that the propagation noise power density usually varies with sideband frequency ƒ (measured from the carrier) as 1/ƒ2, for f in the range 0.1 to 10 c.p.s. Departures from this law have been observed in the regions near 0.1 c.p.s. and 10 c.p.s. The measurement of the power spectrum directly offers several advantages over the conventional signal strength recording method, and these are discussed herein.

Efficient Nonlinear Energy Harvesting with Wrinkled Piezoelectric Membranes

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Igor Neri ◽  
Miquel López-Suárez
Keyword(s):  
Power Density ◽  
Mechanical Response ◽  
Excitation Amplitude ◽  
Electric Response ◽  
Noise Power ◽  
External Excitation ◽  
Piezoelectric Energy ◽  
Nonlinear Mechanical ◽  
Nonlinear Regimes ◽  
Nonlinear Energy

AbstractWe investigate the performance of a piezoelectric energy harvester with nonlinearity induced by wrinkles. Linear and nonlinear regimes are detected in the electric response of the device when sweeping the intensity of the external excitation. Those regimes are related to the activation of a nonlinear mechanical response that appears when increasing the excitation amplitude. The wrinkles have been found to improve the power density and the normalized power density, in a certain noise power range.

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