Regulating infrared photoresponses in reduced graphene oxide phototransistors by defect and atomic structure control

Haixin Chang, Zhenhua Sun, Mitsuhiro Saito, Qinghong Yuan, Han Zhang, Jinhua Li, Zhongchang Wang, Takeshi Fujita, Feng Ding, Zijian Zheng, Feng Yan, Hongkai Wu, Mingwei Chen, Yuichi Ikuhara

Research output: Journal article publicationJournal articleAcademic researchpeer-review

92 Citations (Scopus)


Defects play significant roles in properties of graphene and related device performances. Most studies of defects in graphene focus on their influences on electronic or luminescent optical properties, while controlling infrared optoelectronic performance of graphene by defect engineering remains a challenge. In the meantime, pristine graphene has very low infrared photoresponses of ∼0.01 A/W due to fast photocarrier dynamics. Here we report regulating infrared photoresponses in reduced graphene oxide phototransistors by defect and atomic structure control for the first time. The infrared optoelectronic transport and photocurrent generation are significantly influenced and well controlled by oxygenous defects and structures in reduced graphene oxide. Moreover, remarkable infrared photoresponses are observed in photoconductor devices based on reduced graphene oxide with an external responsivity of ∼0.7 A/W, at least over one order of magnitude higher than that from pristine graphene. External quantum efficiencies of infrared devices reach ultrahigh values of ∼97%, which to our knowledge is one of the best efficiencies for infrared photoresponses from nonhybrid, pure graphene or graphene-based derivatives. The flexible infrared photoconductor devices demonstrate no photoresponse degradation even after 1000 bending tests. The results open up new routes to control optoelectronic behaviors of graphene for high-performance devices.
Original languageEnglish
Pages (from-to)6310-6320
Number of pages11
JournalACS Nano
Issue number7
Publication statusPublished - 23 Jul 2013


  • defect
  • infrared
  • photoresponse
  • phototransistor
  • reduced graphene oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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