Responsivity and detectivity enhancements by graphene overlay on normal-incident multicolor quantum grid infrared photodetectors
Journal
Optics Express
Journal Volume
28
Journal Issue
2
Pages
2456-2465
Date Issued
2020
Author(s)
Liang, B.-W.
Huang, C.-C.
Chao, S.-P.
Kao, K.-J.
Simbulan, K.B.
Lan, Y.-W.
CHIEH-HSIUNG KUAN
Abstract
An efficient and effective method to achieve high responsivity and specific detectivity, particularly for normal-incident quantum well infrared photodetectors (QWIPs), is proposed in this study. By combining superlattice (SL) structure, grating structures, and graphene monolayer onto traditional QWIP designs, a graphene-covered multicolor quantum grid infrared photodetector (QGIP) with improved optoelectrical properties is developed. The enhancements of the device's responsivity and specific detectivity are about 7-fold and 20-fold, respectively, which resulted from an increase in the charge depletion region and the generation of extra photoelectrons due to graphene-semiconductor heterojunction. This method provides a potential candidate for future high-performance photodetectors.
SDGs
Type
journal article