High-performance graphene-quantum-dot photodetectors.

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 Rep

journal_title

Scientific reports

authors

Kim CO,Hwang SW,Kim S,Shin DH,Kang SS,Kim JM,Jang CW,Kim JH,Lee KW,Choi SH,Hwang E

doi

10.1038/srep05603

subject

Has Abstract

pub_date

2014-07-07 00:00:00

pages

5603

issn

2045-2322

pii

srep05603

journal_volume

4

pub_type

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