Superlattice Infrared Photodetector with Double Barriers
Date Issued
2006
Date
2006
Author(s)
Wu, Kun-Jheng
DOI
en-US
Abstract
The superlattice structure has been used extensively in the infrared photodetectors. In this thesis, our purpose is to fabricate a superlattice infrared photodetector (SLIP) with high detectivity.
First, we propose a novel structure for the superlattice infrared photodetector. The structure is composed of a 15-period superlattice sandwiched between two asymmetric blocking layers. By the simple fabrication process and the measurement setup, we can measure the electrical and optical properties of our devices.
This structure shows asymmetric current-voltage characteristic and different photoresponse when we switch the bias polarity. To obtain more information, we change the etching depth and fabricate two detectors Sample A and Sample B. Sample A is with the original structure and Sample B is the detector with only one barrier.
The experiment data reveals that the responsivity and detectivity of Sample B are better than that of Sample A. By the comparison of these two detectors, we propose the operational mechanism and have further understanding of the asymmetric current-voltage characteristic. Furthermore, Sample B shows the promising detectivity in comparison with Sample A. This result is helpful for us to improve the performance of our detectors.
First, we propose a novel structure for the superlattice infrared photodetector. The structure is composed of a 15-period superlattice sandwiched between two asymmetric blocking layers. By the simple fabrication process and the measurement setup, we can measure the electrical and optical properties of our devices.
This structure shows asymmetric current-voltage characteristic and different photoresponse when we switch the bias polarity. To obtain more information, we change the etching depth and fabricate two detectors Sample A and Sample B. Sample A is with the original structure and Sample B is the detector with only one barrier.
The experiment data reveals that the responsivity and detectivity of Sample B are better than that of Sample A. By the comparison of these two detectors, we propose the operational mechanism and have further understanding of the asymmetric current-voltage characteristic. Furthermore, Sample B shows the promising detectivity in comparison with Sample A. This result is helpful for us to improve the performance of our detectors.
Subjects
超晶格紅外線偵測器
Superlattice
Type
thesis
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