THEORETICAL STUDY OF UNIPOLAR INTERSUBBAND IMPACT IONIZATION IN QUANTUM DOT BASED PHOTODETECTORS

2013 ◽  
Vol 27 (29) ◽  
pp. 1350208 ◽  
Author(s):  
AMIR YUSEFLI ◽  
MAHDI ZAVVARI ◽  
KAMBIZ ABEDI
Keyword(s):  
Quantum Dot ◽  
Transition Rate ◽  
Theoretical Study ◽  
Impact Ionization ◽  
Photogenerated Electron ◽  
Ionization Rate ◽  
Rate Equations ◽  
Infrared Photodetector ◽  
Avalanche Gain ◽  
Carrier Scattering

In this paper, we study the intersubband impact ionization through conduction band states of quantum dot (QD) layers of an infrared photodetector. For this purpose, a photogenerated electron moving in high field active region of a p-i-n diode is assumed which can excite an electron from ground state of a QD by carrier–carrier scattering. The generated electron can escape the QD by tunneling and contribute in photocurrent giving avalanche gain to photodetector. The ionization rate and responsivity of detector are calculated from an analytical approach of intersubband transition rate equations. Results show increased responsivity in the order of several A/W.

scholarly journals Theoretical study of the electron correlation and excitation effects on energy distribution in photon impact ionization

2019 ◽  
Vol 65 (3) ◽  
pp. 224
Author(s):  
V. Petrovic ◽  
K. Isakovic ◽  
And H. Delibasic
Keyword(s):  
Energy Distribution ◽  
Electron Correlation ◽  
Laser Field ◽  
Transition Rate ◽  
Theoretical Study ◽  
Impact Ionization ◽  
Ionization Mechanism ◽  
Tunneling Ionization ◽  
Analytical Formulas ◽  
Electrical Component

We performed a detailed theoretical study of the electron correlation and core excitation effects on the energy distribution of the ejected electrons in the process of photon impact tunnel ionization. We used the Landau-Dykhne approach to obtain analytical formulas for the transition rate and the energy distribution with included these effects. We have limited ourselves to a non-relativistic domain, in which the rate and distribution are determined by electrical component of the laser field while the influence of magnetic can be neglected. We observed helium and helium like atoms. We have shown that the tunneling ionization mechanism may be understood as the combination of mentioned processes. We considered the case of a monochromatic wave with an elliptically polarized laser field. We compared our results with experimental and shown that ellipticity plays an important role and that inclusion of additional processes significantly influences the transition rate, as well as the energy distribution of the ejected photoelectrons.

Theoretical Study of Electron Initiated Impact Ionization Rate in Bulk GaN using a Wave Vector Dependent Numerical Transition Rate Formulation

1995 ◽  
Vol 395 ◽  
Author(s):  
J. Kolnik ◽  
I.H. Oguzman ◽  
K.F. Brennan ◽  
R. Wang ◽  
P.P. Ruden
Keyword(s):  
Monte Carlo ◽  
Transition Rate ◽  
Phonon Scattering ◽  
Impact Ionization ◽  
Golden Rule ◽  
Ionization Rate ◽  
Ensemble Monte Carlo ◽  
Bulk Gan ◽  
Impact Ionization Rate ◽  
The Impact

ABSTRACTIn this paper, we present ensemble Monte Carlo based calculations of electron initiated impact ionization in bulk zincblende GaN using a wavevector dependent formulation of the interband impact ionization transition rate. These are the first reported estimates, either theoretical or experimental, of the impact ionization rates in GaN. The transition rate is determined from Fermi’s golden rule for a two-body screened Coulomb interaction using a numerically determined dielectric function as well as by numerically integrating over all of the possible final states. The Monte Carlo simulator includes the full details of the first four conduction bands derived from an empirical pseudopotential calculation as well as all of the relevant phonon scattering mechanisms. It is found that the ionization rate has a relatively "soft" threshold.

POLARON IN A QUANTUM DOT UNDER AN ELECTRIC FIELD

2007 ◽  
Vol 21 (24) ◽  
pp. 1635-1642
Author(s):  
MIAN LIU ◽  
WENDONG MA ◽  
ZIJUN LI
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Field Intensity ◽  
Ground State Energy ◽  
Ground State ◽  
Electric Field Intensity ◽  
State Energy ◽  
Theoretical Study ◽  
The Moment ◽  
Transformation Methods

We conducted a theoretical study on the properties of a polaron with electron-LO phonon strong-coupling in a cylindrical quantum dot under an electric field using linear combination operator and unitary transformation methods. The changing relations between the ground state energy of the polaron in the quantum dot and the electric field intensity, restricted intensity, and cylindrical height were derived. The numerical results show that the polar of the quantum dot is enlarged with increasing restricted intensity and decreasing cylindrical height, and with cylindrical height at 0 ~ 5 nm , the polar of the quantum dot is strongest. The ground state energy decreases with increasing electric field intensity, and at the moment of just adding electric field, quantum polarization is strongest.

Theoretical study of excitons in GaAs quantum dot molecules obtained by nanoholes filling

2021 ◽  
Vol 124 ◽  
pp. 105614
Author(s):  
S. Tilouche ◽  
A. Sayari ◽  
M. Omri ◽  
S. Souilem ◽  
L. Sfaxi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Theoretical Study ◽  
Quantum Dot Molecules ◽  
Gaas Quantum Dot

High-performance 30-period quantum-dot infrared photodetector

2005 ◽  
Vol 23 (3) ◽  
pp. 1129 ◽  
Author(s):  
Shu-Ting Chou ◽  
Shih-Yen Lin ◽  
Ru-Shang Hsiao ◽  
Jim-Yong Chi ◽  
Jyh-Shyang Wang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
High Performance ◽  
Infrared Photodetector ◽  
Quantum Dot Infrared Photodetector
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