Photovoltaic and Photoconductive Dual-mode Infrared Photodetector Made by Coupling Superlattice and Quantum Wells
Date Issued
2004
Date
2004
Author(s)
Wang, Yuan-Chu
DOI
en-US
Abstract
The infrared photodetectors are important in many civilian, military and scientific applications. Some of them, for example temperature sensing and target discrimination,
requires the infrared photodetector to be equipped with the ability of multicolor detection. In this thesis, a new structure of superlattice infrared photodetector(SLIP) coupled to a quantum well infrared photoedetector (QWIP)
is investigated. The SLIP is designed for wavelength 6~10µm detection while the QWIP is for wavelength around 11µm. The perspective is the photoresponse
of 10µm from superlattice can couple to quantum wells under low bias with low dark current. The new structure can be operated under both photovoltaic and
photoconductive mode.
For the photovoltaic mode, three different photoresponse peaks from different transitions can be observed. It is believed that one peak is from SLIP and the other two are from QWIP. The lineshapes of the photoresponse will be changed with different temperature. As the temperature rising, the short wavelength photoresponses will be enhanced but the long wavelength ones are suppressed.The photovoltaic effect can be observed until 80K.
For the photoconductive mode, because of the special structure, the photoresponse from SLIP is shown only under low negative bias. The perspective is the photoresponse from superlattice can couple to quantum wells under low negative bias and the photoresponse from both SLIP and QWIP can be observed simultaneously. In this way, we hope we can observe a broadband response. Based on this structure, our detector with photovoltaic and photoconductive dual-mode operation and properties of voltage-switchable and voltage-tunable can be achieved.
Subjects
光致電導
紅外線
光致電壓
超晶格
量子井
Infrared
Photoconductive
Photovoltaic
Superlattice
SDGs
Type
thesis
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