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

Bor Wei Liang, Chiu Chang Huang, Song Po Chao, Kuang Ju Kao, Kristan Bryan Simbulan, Yann Wen Lan, Chieh Hsiung Kuan

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)2456-2465
Number of pages10
JournalOptics Express
Issue number2
Publication statusPublished - 2020 Jan 20


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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