Enhanced numerical analysis of current-voltage characteristics of long wavelength infrared n-on-p HgCdTe photodiodes

2010 ◽  
Vol 108 (7) ◽  
pp. 074519 ◽  
Author(s):  
K. Jóźwikowski ◽  
M. Kopytko ◽  
A. Rogalski ◽  
A. Jóźwikowska
Keyword(s):  
Numerical Analysis ◽  
Long Wavelength ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Long Wavelength Infrared ◽  
Hgcdte Photodiodes

Changes in 8–12 μm CdxHg1−xTe photodiode arrays caused by fast neutron irradiation

2010 ◽  
Vol 18 (3) ◽  
Author(s):  
I.O. Lysiuk ◽  
J.V. Gumenjuk-Sichevska ◽  
S.A. Dvoretsky ◽  
V.S. Varavin
Keyword(s):  
Fast Neutrons ◽  
High Concentration ◽  
Model Calculations ◽  
Long Wavelength ◽  
Current Voltage ◽  
Before And After ◽  
Photodiode Array ◽  
Current Voltage Characteristics ◽  
Photodiode Arrays ◽  
Long Wavelength Infrared

AbstractWe have measured the current-voltage characteristics of the long-wavelength infrared (LWIR) photodiode array, formed on the epitaxial CdxHg1−xTe film (x = 0.21–0.23) with a high concentration of the Shockley-Read-Hall centres, before and after irradiating it with fast neutrons (energy 1 MeV, dose 5×1013 cm−2) at room temperature. Residual changes in current-voltage characteristics, persisting after 20 days, have been identified. Model calculations indicate that the Shockley-Read-Hall centre concentration increases 2–4 times, and the carrier lifetime decreases 2–5 times after the irradiation.

Thermally activated current–voltage asymmetry in quantum-well inter-subband photodetectors

1996 ◽  
Vol 74 (S1) ◽  
pp. 9-15 ◽  
Author(s):  
P. V. Kolev ◽  
M. J. Deen ◽  
H. C. Liu ◽  
Jianmeng Li ◽  
M. Buchanan ◽  
...  
Keyword(s):  
Quantum Well ◽  
Carrier Transport ◽  
Transport Phenomena ◽  
Infrared Region ◽  
Avalanche Photodetectors ◽  
Long Wavelength ◽  
Hot Carrier ◽  
Thermally Activated ◽  
Current Voltage ◽  
Long Wavelength Infrared

Continuing research interest in quantum-well inter-subband-based devices can be associated with its prospects for numerous optoelectronic applications in the long wavelength infrared region. This paper presents experimentally measured field dependence of the thermally activated effective-barrier lowering in quantum-well inter-subband photodetectors (QWIPs). This barrier lowering is considered to be the main cause of the commonly observed asymmetry in the current–voltage characteristics of QWIPs. The research results presented here are important for understanding the factors determining the dark-current mechanisms that are crucial for further improvement in the characteristics of these devices. The study of current-carrier transport phenomena in a quantum well is also of interest for developing quantum-well lasers and avalanche photodetectors based on intraband processes, and also transistors based on ballistic or hot carrier transport phenomena.

Germanium Far Infrared Blocked Impurity Band Detectors

1997 ◽  
Vol 484 ◽  
Author(s):  
C. S. Olsen ◽  
J. W. Beeman ◽  
W. L. Hansen ◽  
E. E. Hallerab
Keyword(s):  
High Purity ◽  
Far Infrared ◽  
Impurity Band ◽  
Infrared Detection ◽  
Long Wavelength ◽  
Current Voltage ◽  
Heavily Doped ◽  
Absorbing Layer ◽  
Blocked Impurity Band Detectors ◽  
Long Wavelength Infrared

AbstractWe report on the development of Germanium Blocked Impurity Band (BIB) photoconductors for long wavelength infrared detection in the 100 to 250.μm region. Liquid Phase Epitaxy (LPE) was used to grow the high purity blocking layer, and in some cases, the heavily doped infrared absorbing layer that comprise theses detectors. To achieve the stringent demands on purity and crystalline perfection we have developed a high purity LPE process which can be used for the growth of high purity as well as purely doped Ge epilayers. The low melting point, high purity metal, Pb, was used as a solvent. Pb has a negligible solubility <1017 cm−3 in Ge at 650°C and is isoelectronic with Ge. We have identified the residual impurities Bi, P, and Sb in the Ge epilayers and have determined that the Pb solvent is the source. Experiments are in progress to purify the Pb. The first tests of BIB structures with the purely doped absorbing layer grown on high purity substrates look very promising. The detectors exhibit extended wavelength cutoff when compared to standard Ge:Ga photoconductors (155 μm vs. 120 μm) and show the expected asymmetric current-voltage dependencies. We are currently optimizing doping and layer thickness to achieve the optimum responsivity, Noise Equivalent Power (NEP), and dark current in our devices.

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