scholarly journals HOT-ELECTRON TRANSPORT IN QUANTUM-DOT PHOTODETECTORS

2008 ◽  
Vol 18 (04) ◽  
pp. 1013-1022 ◽  
Author(s):  
L. H. CHIEN ◽  
A. SERGEEV ◽  
N. VAGIDOV ◽  
V. MITIN
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Electric Field ◽  
Electric Fields ◽  
Hot Electron ◽  
Potential Relief ◽  
Potential Barriers ◽  
Electron Kinetics ◽  
Unintentional Doping ◽  
Hot Electron Transport

Employing Monte-Carlo simulations we investigate effects of an electric field on electron kinetics and transport in quantum-dot structures with potential barriers created around dots via intentional or unintentional doping. Results of our simulations demonstrate that the photoelectron capture is substantially enhanced in strong electric fields and this process has an exponential character. Detailed analysis shows that effects of the electric field on electron capture in the structures with barriers are not sensitive to the redistribution of electrons between valleys and these effects are not related to an increase of drift velocity. Most data find adequate explanation in the model of hot-electron transport in the potential relief of quantum dots. Electron kinetics controllable by potential barriers and an electric field may provide significant improvements in the photoconductive gain, detectivity, and responsivity of photodetectors.

Electron transport in AlN under high electric fields

2001 ◽  
Vol 693 ◽  
Author(s):  
Ramón Collazo ◽  
Raoul Schlesser ◽  
Amy Roskowski ◽  
Robert F. Davis ◽  
Z. Sitar
Keyword(s):  
Electron Transport ◽  
Energy Distribution ◽  
Electric Fields ◽  
Applied Field ◽  
Electron Velocity ◽  
Hot Electron ◽  
Energy Position ◽  
Aln Film ◽  
High Electric Fields ◽  
Hot Electron Transport

AbstractThe energy distribution of electrons transported through an intrinsic AlN film was directly measured as a function of the applied field, and AlN film thickness. Following the transport, electrons were extracted into vacuum through a semitransparent Au electrode and their energy distribution was measured using an electron spectrometer. Transport through films thicker than 95 nm and applied field between 200 kV/cm -350 kV/cm occurred as steady-state hot electron transport represented by a Maxwellian energy distribution, with a corresponding carrier temperature. At higher fields (470 kV/cm), intervalley scattering was evidenced by a multi-component energy distribution with a second peak at the energy position of the first satellite valley. Electron transport through films thinner than 95 nm demonstrated velocity overshoot under fields greater than 550 kV/cm. This was evidenced by a symmetric energy distribution centered at an energy above the conduction band minimum. This indicated that the drift component of the electron velocity was on the order of the “thermal” component. A transient length of less than 80 nm was deduced from these observations.

scholarly journals Electron transport in a coupled GaN/AlN/GaN channel of nitride HFET

2017 ◽  
Vol 56 (4) ◽  
pp. 217-222
Author(s):  
Linas Ardaravičius ◽  
Oleg Kiprijanovič ◽  
Juozapas Liberis
Keyword(s):  
Electron Transport ◽  
Electric Fields ◽  
Electron Density Profile ◽  
Electron Velocity ◽  
Hot Electron ◽  
Optimal Frequency ◽  
Hot Phonons ◽  
Gan Heterostructure ◽  
Hot Electron Transport ◽  
Coupled Channel

Longitudinal hot-electron transport is investigated for the alloy-free AlGaN/AlN/{GaN/AlN/GaN} heterostructure at electric fields up to 380 kV/cm. The structure featured a coupled channel with a camelback electron density profile. The hot-electron drift velocity in the coupled channel is estimated as ~1.5×107 cm/s and is ~50% higher as compared with the standard AlN-spacer GaN 2DEG channel. The HFET with the pristine 2DEG density of 1.75×1013 cm–2 confined in the coupled channel demonstrates the optimal frequency performance in terms of electron velocity at a relatively low gate bias of VGS = –1.75 V. These results are consistent with the ultra-fast decay of hot phonons.

ELECTRON HEATING IN QUANTUM-DOT STRUCTURES WITH COLLECTIVE POTENTIAL BARRIERS

2011 ◽  
Vol 20 (01) ◽  
pp. 143-152 ◽  
Author(s):  
L.H. CHIEN ◽  
A. SERGEEV ◽  
N. VAGIDOV ◽  
V. MITIN ◽  
S. BIRNER
Keyword(s):  
Quantum Dots ◽  
Monte Carlo ◽  
Quantum Dot ◽  
Electric Field ◽  
Monte Carlo Simulations ◽  
Electric Fields ◽  
Geometrical Parameters ◽  
Electron Heating ◽  
Potential Barriers ◽  
Strong Electric Fields

Here we report our research on quantum-dot structures with collective barriers surrounding groups of quantum dots (planes, clusters etc) and preventing photoelectron capture. Employing Monte-Carlo simulations, we investigate photoelectron kinetics and calculate the photoelectron lifetime as a function of geometrical parameters of the structures, dot occupation, and electric field. Results of our simulations demonstrate that the capture processes are substantially suppressed by the potential barriers and enhanced in strong electric fields. Detailed analysis shows that the effects of the electric field can be explained by electron heating, i.e. field effects become significant, when the shift of the electron temperature due to electron heating reaches the barrier height. Optimized photoelectron kinetics in quantum-dot structures with collective barriers allows for significant improvements in the photoconductive gain, detectivity, and responsivity of photodetectors based on these structures.

Hot electron transport effects in lead telluride

1976 ◽  
Vol 20 (11) ◽  
pp. 1089-1095 ◽  
Author(s):  
G.P. Carver ◽  
B.B. Houston ◽  
J.R. Burke ◽  
D.K. Ferry
Keyword(s):  
Electron Transport ◽  
Lead Telluride ◽  
Hot Electron ◽  
Transport Effects ◽  
Hot Electron Transport
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