National Repository of Grey Literature 27 records found  beginprevious18 - 27  jump to record: Search took 0.00 seconds. 
Characterization of lasers with ë-InAs layers in GaAs
Hazdra, P. ; Voves, J. ; Oswald, Jiří ; Hulicius, Eduard ; Pangrác, Jiří ; Melichar, Karel ; Šimeček, Tomislav ; Petříček, Otto ; Kuldová, Karla
The dependence of the electroluminescence spectra on the number of ë-InAs layers and on the distance of these ë-InAs layers was studied under pulse excitation in the wide range of current densities.
Ballistic electron emission microscopy of InAs quantum dots in AlGaAs/GaAs heterostructure
Vaniš, Jan ; Hulicius, Eduard ; Pangrác, Jiří ; Melichar, Karel ; Walachová, Jarmila
Ballistic electron emission measurements of InAs/GaAs quantum dots in AlGaAs/GaAs heterostructures are presented in our contribution. Measured heterostructure was prepared by MOCVD technique. The area of 1 μm.sup.2./sup. was analyzed during measurements. Different size and shape of quantum dots on an examined area were vizualized. The average size of quantum dots were 10 nm and less. The observed shapes are probably connected with density of states in quantum dots.
Measurement of electro-optical properties of quantum-size structures based on InAs/GaAs - photocurrent and electroluminescence
Mačkal, Adam ; Hazdra, P. ; Hulicius, Eduard ; Oswald, Jiří ; Pangrác, Jiří ; Melichar, Karel ; Hospodková, Alice ; Šimeček, Tomislav
Contribution presents the electroluminescence, photoabsorption and polarization properties of semiconductor lasers with thin strained InAs layers in GaAs at elevated temperatures. The lasers exhibit high optical recombination efficiency, low threshold current density and wide temperature operation range (above 100řC).
Lasery s napjatými tenkými InAs vrstvami v GaAs - elektroluminiscence a fotoabsorpce při zvýšených teplotách
Mačkal, Adam ; Hazdra, P. ; Hulicius, Eduard ; Pangrác, Jiří ; Melichar, Karel
Electro-optical characterisation of semiconductor lasers with very thin strained InAs layers in GaAs. The lasers exhibit high optical recombination efficiency, low threshold current and capability to operate at elevated temperatures

National Repository of Grey Literature : 27 records found   beginprevious18 - 27  jump to record:
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2 Pangrác, Jan
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