Semimetallic Graphene for Infrared Sensing

Cited 0 time in webofscience Cited 0 time in scopus
29 Viewed 8 Downloaded
Title
Semimetallic Graphene for Infrared Sensing
Author(s)
Hamza Zad Gul; Wonkil Sakong; Hyunjin Ji; Jorge Torres; Hojoon Yi; Mohan Kumar Ghimire; Jung Hyun Yoon; Min Hee Yun; Ha Ryong Hwang; Young Hee Lee; Seong Chu Lim
Publication Date
2019-05
Journal
ACS APPLIED MATERIALS & INTERFACES, v.11, no.21, pp.19565 - 19571
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society.Both photothermal and photovoltaic infrared (IR) detectors employ sensing materials that have an optical band gap. Different from these conventional materials, graphene has a conical band structure that imposes zero band gap. In this study, using the semimetallic multilayer graphene, IR detection at room temperature is realized. The relatively high Seebeck coefficient, ranging from 40 to 60 μV/K, compared to that of the metal, and the large optical absorption in the mid-IR region, in the wavelength range of 7-17 μm, enable graphene to detect IR without an absorber, which is essential for most IR detectors because the band gap of the sensing materials is much larger than the energy of IR and the incident IR can be absorbed directly by the sensing material. Thus, the incident IR can be absorbed directly by the sensing material in our device. The developed detector with a SiN membrane shows high responsivity and detectivity, which are 140 V/W and 5 × 108 cm·Hz1/2/W at 5 Hz, respectively. In addition, the IR sensor shows a response time of 600 μs. In the room-temperature operation of the IR sensor array without cooling, our sensors detect IR emitted from a human body and track the movement. The availability of large-area graphene in current technology opens new applications for metallic two-dimensional materials and a possibility for scale-up
URI
https://pr.ibs.re.kr/handle/8788114/5970
ISSN
1944-8244
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Semimetallic_ACS Appl. Mater. Interfaces_Seong Chu Lim.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse