Performance and application of a superlattice infrared photodetector with a blocking barrier
Journal
Journal of Applied Physics
Journal Volume
91
Journal Issue
3
Pages
943-948
Date Issued
2002
Author(s)
CHIEH-HSIUNG KUAN
Chen, C.C.
Chen, H.C.
Hsu, M.C.
Hsieh, W.H.
Kuan, C.H.
Wang, S.Y.
Lee, C.P.
CHIEH-HSIUNG KUAN
Abstract
An infrared photodetector that contains a superlattice structure and a blocking barrier was investigated. The photodetector shows advantages including a low operating voltage (<0.7 V), wide detection bandwidth, flexible miniband engineering, and in particular, voltage-tunable spectral responsivity. The blocking barrier not only prohibits the dark current but also acts as a high-pass energy filter to tune the spectral responsivity. The zero background peak detectivity of our detector is 3.7��109 cm Hz0.5/W (9.7 �gm) at ?0.5 V and 2.2��1010 cm Hz0.5/W (6.7 �gm) at ?0.1 V. Since the spectral responsivity at different biases is independent, temperature sensing is feasible by taking the ratio of the measured photocurrent at different biases. A demonstration of temperature sensing by using our superlattice infrared photodetector with a blocking barrier is also shown in this article. Those results show the superlattice is a simple and efficient structure for the design of a multicolor infrared photodetector.
SDGs
Type
journal article