Multifunctional Graphene Optoelectronic Devices Capable of Detecting and Storing Photonic Signals

Sukjae Jang, Euyheon Hwang, Youngbin Lee, Seungwoo Lee, Jeong Ho Cho

Research output: Contribution to journalReview article

67 Citations (Scopus)

Abstract

The advantages of graphene photodetectors were utilized to design a new multifunctional graphene optoelectronic device. Organic semiconductors, gold nanoparticles (AuNPs), and graphene were combined to fabricate a photodetecting device with a nonvolatile memory function for storing photonic signals. A pentacene organic semiconductor acted as a light absorption layer in the device and provided a high hole photocurrent to the graphene channel. The AuNPs, positioned between the tunneling and blocking dielectric layers, acted as both a charge trap layer and a plasmonic light scatterer, which enable storing of the information about the incident light. The proposed pentacene-graphene-AuNP hybrid photodetector not only performed well as a photodetector in the visible light range, it also was able to store the photonic signal in the form of persistent current. The good photodetection performance resulted from the plasmonics-enabled enhancement of the optical absorption and from the photogating mechanisms in the pentacene. The device provided a photoresponse that depended on the wavelength of incident light; therefore, the signal information (both the wavelength and intensity) of the incident light was effectively committed to memory. The simple process of applying a negative pulse gate voltage could then erase the programmed information. The proposed photodetector with the capacity to store a photonic signal in memory represents a significant step toward the use of graphene in optoelectronic devices.

Original languageEnglish
Pages (from-to)2542-2547
Number of pages6
JournalNano Letters
Volume15
Issue number4
DOIs
Publication statusPublished - 2015 Apr 8
Externally publishedYes

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Keywords

  • Flexible optoelectronics
  • Graphene
  • Nonvolatile memory
  • Photodetector
  • Photogating
  • Plasmonic

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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