Journal
ACS NANO
Volume 7, Issue 7, Pages 6310-6320Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4023679
Keywords
reduced graphene oxide; defect; infrared; photoresponse; phototransistor
Categories
Funding
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- MEXT
- JSPS, Japan [25870057]
- Research Grants Council (RGC) of Hong Kong, China [PolyU5322/10E]
- Grants-in-Aid for Scientific Research [24656376, 24686069, 25870057] Funding Source: KAKEN
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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 similar to 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 similar to 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 similar to 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.
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