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Award Abstract #1254468

CAREER: Graphene Heterostructures Based Hot Carrier Optoelectronics

Div Of Electrical, Commun & Cyber Sys
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Initial Amendment Date: January 24, 2013
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Latest Amendment Date: January 24, 2013
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Award Number: 1254468
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Award Instrument: Standard Grant
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Program Manager: Mahmoud Fallahi
ECCS Div Of Electrical, Commun & Cyber Sys
ENG Directorate For Engineering
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Start Date: March 1, 2013
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End Date: February 28, 2018 (Estimated)
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Awarded Amount to Date: $400,000.00
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Investigator(s): Zhaohui Zhong zzhong@umich.edu (Principal Investigator)
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Sponsor: University of Michigan Ann Arbor
3003 South State St. Room 1062
Ann Arbor, MI 48109-1274 (734)763-6438
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Program Reference Code(s): 094E, 1045, 8028
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Program Element Code(s): 1517


Objective: The objective of this proposal is to study the nonequilibrium hot carrier dynamics in graphene, and to explore novel graphene heterostructure devices for hot carrier optoelectronic applications. The approach is based on the integration of scanning photocurrent technique with femtosecond time-delay measurement technique. The proposal also aims to demonstrate a new type of graphene heterostructure based ultra-broadband infrared photodetector with high responsivity.

Intellectual Merit: The intellectual merit is the pioneering of graphene based hot carrier optoelectronics. The femtosecond scanning photocurrent measurement technique can be applied to other optoelectronic devices, and the investigation of hot carrier dynamics in graphene should improve the fundamental understanding of optoelectronic physics in low dimension. The hot carrier tunneling mediated photoresponse in graphene heterostructure transistors will also lead to new photodetection mechanism ideal for mid-far infrared applications.

Broader Impacts: The proposed research is highly transformative and will generate a new type of room temperature broadband infrared detector with unparalleled sensitivity. The proposal?s strong emphasis on basic science, nanoscale material, and device physics will enhance science and engineering education at both undergraduate and graduate level. The proposed outreach activities will also promote the awareness and interest in nanoscience and nanotechnology for K-12 and undergraduate students. This program will place emphasis on recruiting students from underrepresented groups. Knowledge and technologies gain from this research will be incorporated into undergraduate course revision and the development of a new graduate course focusing on carbon nanomaterials.


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Girish S. Kulkarni, Karthik Reddy, Zhaohui Zhong & Xudong Fan. "Graphene nanoelectronic heterodyne sensor
for rapid and sensitive vapour detection," Nature Communications, v.5, 2014, p. 4376.

You-Chia Chang, Chang-Hua Liu, Che-Hung Liu, Zhaohui Zhong, and Theodore B. Norris. "Extracting the complex optical conductivity of mono- and bilayer graphene by ellipsometry," Applied Physics Letters, v.104, 2014, p. 261909.

C. H. Liu, Y. C. Chang, Y. Zhang, Y. F. Zhang, T. Norris, and Z. Zhong. "Ultrafast lateral photo-Dember effect in graphene induced by nonequilibrium hot carriers dynamics," Nano Letters, v.15, 2015, p. 4234.

Seunghyun Lee and Zhaohui Zhong. "Nanoelectronic circuits based on two-dimensional atomic layer crystals," Nanoscale, v.6, 2014, p. 13283.

C. H. Liu, Y. C. Chang, T. Norris, and Z. Zhong. "Room temperature ultra-broadband and high responsivity graphene photodetectors," Nature Nanotechnology, v.9, 2014, p. 273.


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