Title :
Responsivity analysis of a resonant cavity QDIP at 10 µm wavelength
Author :
Mir-Derikvandi, Ali ; Ahmadi, Vahid
Author_Institution :
Dept. of Electr. Eng., Tarbiat Modares Univ., Tehran, Iran
fDate :
June 28 2009-July 2 2009
Abstract :
In this paper, based on 8-band k.p method, we study the infrared wavelength absorption through the conduction subbands of InAs/GaAs pyramidal shape quantum dots (PSQDs) using finite difference method. Considering homogeneous and inhomogeneous broadening effects we design an asymmetric multiple barrier resonant tunnelling (AMBRT) quantum dot infrared photodetector (QDIP) for lower dark current at lambda=10 mum. Considering coverage factor of QDs, quantum efficiency (QE) of QDIP is calculated. Although absorption coefficient of QDs is large, QE is low due to their ultra short effective absorption region. To enhance QDIP-QE and consequently its responsivity an appropriate resonant cavity structure is proposed. We use InGaAs/InAlAs DBR as the bottom reflector for the designed AMBRT InAs/GaAs QDIP and Au as the top mirror. The reflectivity of the DBR is calculated by transfer matrix method. It is shown that with certain periods of InGaAs/InAlAs DBR, QE increases to about 40 times of similar conventional QDIP.
Keywords :
III-V semiconductors; aluminium compounds; distributed Bragg reflectors; finite difference methods; gallium arsenide; indium compounds; infrared detectors; photodetectors; quantum dots; InGaAs-InAlAs; asymmetric multiple barrier resonant tunnelling; distributed Bragg reflectors; finite difference method; infrared wavelength absorption; inhomogeneous broadening; pyramidal shape quantum dots; quantum dot infrared photodetector; resonant cavity structure; responsivity analysis; transfer matrix; wavelength 10 mum; Distributed Bragg reflectors; Electromagnetic wave absorption; Finite difference methods; Gallium arsenide; Indium compounds; Indium gallium arsenide; Quantum dots; Resonance; Resonant tunneling devices; Shape; QDIP; pyramidal shape; quantum efficiency; resonant cavity; responsivity;
Conference_Titel :
Transparent Optical Networks, 2009. ICTON '09. 11th International Conference on
Conference_Location :
Azores
Print_ISBN :
978-1-4244-4825-8
Electronic_ISBN :
978-1-4244-4827-2
DOI :
10.1109/ICTON.2009.5185159