Abstract:
:Graphene quantum dots (GQDs) have received much attention due to their novel phenomena of charge transport and light absorption/emission. The optical transitions are known to be available up to ~6 eV in GQDs, especially useful for ultraviolet (UV) photodetectors (PDs). Thus, the demonstration of photodetection gain with GQDs would be the basis for a plenty of applications not only as a single-function device in detecting optical signals but also a key component in the optoelectronic integrated circuits. Here, we firstly report high-efficient photocurrent (PC) behaviors of PDs consisting of multiple-layer GQDs sandwiched between graphene sheets. High detectivity (>10(11) cm Hz(1/2)/W) and responsivity (0.2 ~ 0.5 A/W) are achieved in the broad spectral range from UV to near infrared. The observed unique PD characteristics prove to be dominated by the tunneling of charge carriers through the energy states in GQDs, based on bias-dependent variations of the band profiles, resulting in novel dark current and PC behaviors.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kim CO,Hwang SW,Kim S,Shin DH,Kang SS,Kim JM,Jang CW,Kim JH,Lee KW,Choi SH,Hwang Edoi
10.1038/srep05603subject
Has Abstractpub_date
2014-07-07 00:00:00pages
5603issn
2045-2322pii
srep05603journal_volume
4pub_type
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