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Title: Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime

Abstract

Graphene is a very attractive material for broadband photodetection in hyperspectral imaging and sensing systems. However, its potential use has been hindered by tradeoffs between the responsivity, bandwidth, and operation speed of existing graphene photodetectors. Here, we present engineered photoconductive nanostructures based on gold-patched graphene nano-stripes, which enable simultaneous broadband and ultrafast photodetection with high responsivity. These nanostructures merge the advantages of broadband optical absorption, ultrafast photocarrier transport, and carrier multiplication within graphene nano-stripes with the ultrafast transport of photocarriers to gold patches before recombination. Through this approach, high-responsivity operation is realized without the use of bandwidth-limiting and speed-limiting quantum dots, defect states, or tunneling barriers. We demonstrate high-responsivity photodetection from the visible to infrared regime (0.6 A/W at 0.8 μm and 11.5 A/W at 20 μm), with operation speeds exceeding 50 GHz. Our results demonstrate improvement of the response times by more than seven orders of magnitude and an increase in bandwidths of one order of magnitude compared to those of higher-responsivity graphene photodetectors based on quantum dots and tunneling barriers.

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States). Electrical Engineering Dept.
Publication Date:
Research Org.:
Univ. of California, Los Angeles (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1510255
Grant/Contract Number:  
SC0016925
Resource Type:
Accepted Manuscript
Journal Name:
Light, Science & Applications
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2047-7538
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cakmakyapan, Semih, Lu, Ping Keng, Navabi, Aryan, and Jarrahi, Mona. Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime. United States: N. p., 2018. Web. doi:10.1038/s41377-018-0020-2.
Cakmakyapan, Semih, Lu, Ping Keng, Navabi, Aryan, & Jarrahi, Mona. Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime. United States. doi:10.1038/s41377-018-0020-2.
Cakmakyapan, Semih, Lu, Ping Keng, Navabi, Aryan, and Jarrahi, Mona. Wed . "Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime". United States. doi:10.1038/s41377-018-0020-2. https://www.osti.gov/servlets/purl/1510255.
@article{osti_1510255,
title = {Gold-patched graphene nano-stripes for high-responsivity and ultrafast photodetection from the visible to infrared regime},
author = {Cakmakyapan, Semih and Lu, Ping Keng and Navabi, Aryan and Jarrahi, Mona},
abstractNote = {Graphene is a very attractive material for broadband photodetection in hyperspectral imaging and sensing systems. However, its potential use has been hindered by tradeoffs between the responsivity, bandwidth, and operation speed of existing graphene photodetectors. Here, we present engineered photoconductive nanostructures based on gold-patched graphene nano-stripes, which enable simultaneous broadband and ultrafast photodetection with high responsivity. These nanostructures merge the advantages of broadband optical absorption, ultrafast photocarrier transport, and carrier multiplication within graphene nano-stripes with the ultrafast transport of photocarriers to gold patches before recombination. Through this approach, high-responsivity operation is realized without the use of bandwidth-limiting and speed-limiting quantum dots, defect states, or tunneling barriers. We demonstrate high-responsivity photodetection from the visible to infrared regime (0.6 A/W at 0.8 μm and 11.5 A/W at 20 μm), with operation speeds exceeding 50 GHz. Our results demonstrate improvement of the response times by more than seven orders of magnitude and an increase in bandwidths of one order of magnitude compared to those of higher-responsivity graphene photodetectors based on quantum dots and tunneling barriers.},
doi = {10.1038/s41377-018-0020-2},
journal = {Light, Science & Applications},
number = 1,
volume = 7,
place = {United States},
year = {2018},
month = {6}
}

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Works referenced in this record:

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