Open AccessResponsivity and detectivity enhancements by graphene overlay on normal-incident multicolor quantum grid infrared photodetectors
Author(s) -
Bor Wei Liang,
Chiu Chang Huang,
Song Po Chao,
Kuang Ju Kao,
Kristan Bryan Simbulan,
Yann Wen Lan,
ChenHsiang Kuan
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.384379
Subject(s) - responsivity , photodetector , optoelectronics , quantum well infrared photodetector , specific detectivity , graphene , optics , infrared , materials science , photoelectric effect , superlattice , quantum efficiency , heterojunction , quantum well , physics , nanotechnology , laser
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.