Optical Characterization of p-Type 4H-SiC Epilayers

2015 ◽  
Vol 821-823 ◽  
pp. 249-252 ◽  
Author(s):  
Gediminas Liaugaudas ◽  
Donatas Dargis ◽  
Pawel Kwasnicki ◽  
Hervé Peyre ◽  
Roxana Arvinte ◽  
...  
Keyword(s):  
Carrier Lifetime ◽  
Diffusion Length ◽  
Hole Mobility ◽  
Optical Characterization ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Activation Ratio ◽  
P Type

A series of aluminium doped (from 2×1016to 8×1019cm-3) 4H-SiC epitaxial layers were mainly studied by Low Temperature Photoluminescence and time-resolved optical pump-probe techniques to determine the concentration of aluminium, its activation ratio, the doping related carrier lifetime, hole mobility and excess carrier diffusion length.

Optical Characterization of Compensating Defects in Cubic SiC

2013 ◽  
Vol 740-742 ◽  
pp. 401-404
Author(s):  
Patrik Ščajev ◽  
K. Jarašiūnas ◽  
P.L. Abramov ◽  
S.P. Lebedev ◽  
A.A. Lebedev
Keyword(s):  
Carrier Density ◽  
Nonlinear Optical ◽  
Carrier Lifetime ◽  
Optical Trap ◽  
Optical Characterization ◽  
Carrier Dynamics ◽  
Time Resolved ◽  
Carrier Recombination ◽  
P Type

We present investigation of carrier recombination and optical trap recharge in sublimation grown n- and p-type 3C layers by using time-resolved nonlinear optical techniques. Carrier lifetime and recharged trap recovery were measured by differential transmittivity technique. By monitoring nonequilibrium carrier dynamics, we analyzed impact of carrier density and temperature on carrier lifetime and recharged trap recovery rate. Large carrier lifetime and small diffusivity at low injections in highly compensated samples and their dependences on injection were explained by optical recharge of compensating aluminum impurities. The complete recharge of the compensating impurities by optical means allowed us to calculate the compensating aluminum density in n-type samples and compensating nitrogen in p-type ones.

scholarly journals Excitation-dependent carrier lifetime and diffusion length in bulk CdTe determined by time-resolved optical pump-probe techniques

2018 ◽  
Vol 123 (2) ◽  
pp. 025704 ◽  
Author(s):  
Patrik Ščajev ◽  
Saulius Miasojedovas ◽  
Algirdas Mekys ◽  
Darius Kuciauskas ◽  
Kelvin G. Lynn ◽  
...  
Keyword(s):  
Carrier Lifetime ◽  
Diffusion Length ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
And Diffusion

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

Magneto-Optical Characterization of the Nitrogen-Related Impurities in p-Type ZnSe Epilayers

2000 ◽  
Vol 180 (1) ◽  
pp. 195-199 ◽  
Author(s):  
L. Gravier ◽  
H. Makino ◽  
K. Arai ◽  
H. Sasaki ◽  
K. Kimura ◽  
...  
Keyword(s):  
Optical Characterization ◽  
Related Impurities ◽  
P Type

scholarly journals Synthesis and Optical Characterization of Carbon Dot from Peels of Dragon Fruit and Pear

2018 ◽  
Vol 4 (1) ◽  
pp. 19 ◽  
Author(s):  
Selvy Uftovia Hepriyadi ◽  
. Isnaeni
Keyword(s):  
Carbon Dots ◽  
Optical Characterization ◽  
Heating Time ◽  
Emission Wavelength ◽  
Time Resolved ◽  
Carbon Dot ◽  
Infrared Wavelength ◽  
Dragon Fruit ◽  
Time Changes

Fluorescence materials such as carbon dots are unique and non-toxic materials that can be produced using many methods. In this research, synthesis and optical characterization of carbon dots from the peels of dragon fruit and pear have been done. The synthesis uses bottom-up method using microwave with 20 minutes, 40 minutes, and 80 minutes of heating time. The result of optical characterizations showed that the samples that have been heat treated are carbon dots based of the absorbance in the range of 280-350 nm, and the intensity are decreased in the range of visible and infrared wavelength. There are emission and intensity changes by different heat treatments. From the samples of dragon fruit's peels, the emission wavelength tended to shift toward visible light at the wavelength of 551.51 nm, 507.98 nm and 487.28 nm with the excitation at the wavelength of 420 nm from pulsed pico-laser. While, the emission wavelength from the samples of pears peels were fluctuate in wavelength of 529.09 nm, 507.52 nm and 519.46 nm. Similarly, the time-resolved photoluminescence characterization test showed that there were time changes in each sample of carbon dot. The decay lifetime of carbon dots was fluctuated between 4.5 ns - 5.4 ns for dragon fruit’s peels and about 1.9 ns - 2.4 ns for pear's peels.

Optical characterization of Ba0.5Sr0.5TiO3 material grown on a p-type silicon substrate (111) doped niobium oxide and chlorophyll

2020 ◽  
Vol 568 (1) ◽  
pp. 62-70
Author(s):  
Aep Setiawan ◽  
Endah Kinarya Palupi ◽  
Rofiqul Umam ◽  
Husin Alatas ◽  
Irzaman
Keyword(s):  
Silicon Substrate ◽  
Niobium Oxide ◽  
Optical Characterization ◽  
Type Silicon ◽  
P Type

scholarly journals Time-resolved x-ray/optical pump-probe simulations on N2 molecules

2019 ◽  
Vol 6 (2) ◽  
pp. 024101
Author(s):  
Athiya Mahmud Hanna ◽  
Oriol Vendrell ◽  
Robin Santra
Keyword(s):  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray
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