Title :
Influence of Quantum Dot Dimensions in a DWELL Photodetector on Absorption Co-efficient
Author :
Soumitra, Roy Joy ; Hossain, Golam Md Imran ; Bhowmick, Tonmoy Kumar ; Mohammedy, Farseem Mannan
Author_Institution :
Dept. of Electr. & Electron. Eng., Bangladesh Univ. of Eng. & Technol., Dhaka, Bangladesh
Abstract :
The absorption co-efficient of symmetric conical shaped InAs/InGaAs quantum dots-in-a-well (DWELL) infrared photo-detector has been calculated through Non-Equilibrium Green´s Function (NEGF) approach to explain their relative magnitude resulting from various quantum dot dimensions. Kinetic equation of Green´s function is solved by using method of finite difference and wave-function is calculated from greens function and source term. All possible transitions from bound level of quantum dot to any higher continuum level existing in either quantum well or barrier are taken into account. Trace of peak of absorption co-efficient with gradual change of height to base ratio of quantum dot is simulated under various polarization of incident light.
Keywords :
Green´s function methods; III-V semiconductors; absorption coefficients; finite difference methods; gallium arsenide; indium compounds; infrared detectors; light polarisation; photodetectors; quantum well devices; semiconductor quantum dots; wave functions; DWELL photodetector; InAs-InGaAs; NEGF; absorption coefficient; bound level; continuum level; finite difference method; height-to-base ratio; incident light polarization; kinetic equation; nonequilibrium Green´s function; quantum barrier; quantum dot dimensions; symmetric conical shaped quantum dots-in-a-well infrared photodetector; wave-function; Absorption; Detectors; Gallium arsenide; Green´s function methods; Indium gallium arsenide; Photodetectors; Quantum dots; DWELL QDIP; NEGF; absorption co-efficient; dipole moment; quantum dot dimension;
Conference_Titel :
Modelling Symposium (AMS), 2012 Sixth Asia
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1957-7
DOI :
10.1109/AMS.2012.18