Responsivity and detectivity enhancements by graphene overlay on normal-incident multicolor quantum grid infrared photodetectors | Zendy

Bor-Wei Liang | Zendy; Chiu-Chang Huang | Zendy; Song-Po Chao | Zendy; Kuang-Ju Kao | Zendy; Kristan Bryan Simbulan | Zendy; Yann­Wen Lan | Zendy; Chieh-Hsiung Kuan | Zendy

Open Access

Responsivity 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,

YannWen Lan,

Chieh-Hsiung 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.

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