Title :
Investigation of the space charge effect in the quantum well infrared photodetector
Author :
Kuan, C.H. ; Hsu, Y.F. ; Hsu, M.C.
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
The I-V and noise in quantum well infrared photodetectors are investigated. It´s found two regimes are in sequence with V and V/sup 2/ dependence of the current. The noise power for the second regime shows I/sup 3/2/ dependence. Based on barrier space charge, the first regime is attributed to the transport of residual electrons in equilibrium. The second regime indicates that electron drift velocity and concentration are both proportional to applied biases. All the results is explained with partial potential drop on wells to increase the Fermi level.
Keywords :
Fermi level; infrared detectors; photodetectors; quantum well devices; semiconductor device noise; space charge; Fermi level; I-V characteristics; electron concentration; electron drift velocity; noise power; quantum well infrared photodetector; space charge; Acoustical engineering; Dark current; Electron mobility; Gallium arsenide; Photodetectors; Space charge; Temperature; Thermionic emission; Tunneling; Voltage;
Conference_Titel :
Electron Devices Meeting, 1998. IEDM '98. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-4774-9
DOI :
10.1109/IEDM.1998.746446
