For the IR channel of WFC3 a new type of HgCdTe detector, with 1.7μm cutoff on MBE substrate, is under development at the Rockwell International Science Center . A first batch of array has been produced in summer 1999 and tested at the GSFC Detector Characterization Laboratory (DCL) in September-November 1999. We present the first results of the testing on the prototype HI-101,and in particular...

p–p–n –n ultraviolet photodetectors based on 4H–SiC homoepilayers have been presented. The growth of the 4H–SiC homoepilayers was carried out in a LPCVD system. The size of the active area of the photodetectors was 300 300mm. The dark and illuminated I–V characteristics had been measured at reverse biases form 0 to 20V at room temperature, and the illuminated current was at least two orders of ...

.Abstract-Large-area siliconp-i-n photodetectors with an epitaxial thickness ranging from IO-20 pm were fabricated. The photodiode bandwidth, responsivity, capacitance and dark current were characterized as a function of the epilayer thickness. The determination of these parameters is important to facilitate the designing of photodiodes in which the trade-off between various parameters need to ...

Noise due to dark current is a serious limitation for taking long exposure time images with a CCD digital camera. Current solutions have serious drawbacks: interpolation of pixels with high dark current leads to smoothing effects or other artifacts – especially if a large number of pixels are corrupted. Due to the exponential temperature dependence of the dark current, dark frame subtraction wo...

This paper presents a dark current suppression technique for a light detector in a variable-temperature system. The light detector architecture comprises a photodiode for sensing the ambient light, a dark current diode for conducting dark current suppression, and a current subtractor that is embedded in the current amplifier with enhanced dark current cancellation. The measured dark current of ...

In this paper, we present calculations for different parameters of quantum dot infrared photodetectors. We considered a structure which includes quantum dots with large conduction-band-offset materials (GaN/AlGaN). Single band effective mass approximation has been applied in order to calculate the electronic structure. Throughout the modeling, we tried to consider the limiting factors which dec...

We describe the calibration, measurements and data reduction, of the dark current of the ISOCAM/LW detector. We point-out the existence of two significant drifts of the LW dark-current, one throughout the ISO mission, on a timescale of days, another within each single revolution, on a timescale of hours. We also show the existence of a dependence of the dark current on the temperature of the IS...

In the current paper, we have studied the effect of dark energy on for-mation where dark energy exists in the background. For this purpose, we used both WMAP9 and Planck data to study how the radius changes with redshift in these mod-els. We used different data sets to fix the cosmological parameters to obtain a solution for a spherical region under collapse. The mechanism of structure formation f...