Coupling effects observed in the intersubband photocurrent of photovoltaic double‐barrier quantum‐well infrared detectors

Autor:	S. Ehret, Harald Schneider
Rok vydání:	1996
Předmět:	Photocurrent Wavelength Materials science Infrared business.industry General Physics and Astronomy Optoelectronics Photodetector Biasing Photovoltaic effect business Wave function Quantum well
Zdroj:	Journal of Applied Physics. 79:9369-9374
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.362615
Popis:	The intersubband photocurrent in photovoltaic n‐type GaAs/AlAs/Al0.3Ga0.7As double‐barrier quantum‐well infrared detectors is studied as a function of the applied external voltage and the incident wavelength. The photoresponse shows a significant photovoltaic behavior, resulting from a dopant segregation process during the growth. For an externally applied bias voltage, which compensates the built‐in field, we find a multiple sign change of the photocurrent for varying incident wavelengths. A simulation of the wave functions indicates that this multiple sign change can be attributed to the coupling between the second subband in the GaAs quantum well and the subbands which are localized in the Al0.3Ga0.7As region.
Databáze:	OpenAIRE
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