High performance, self-powered photodetectors based on a graphene/silicon Schottky junction diode
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
KAUST Solar Center (KSC)
Nano Energy Lab
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/631615
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AbstractElectron-hole pair separation and photocurrent conversion at two-dimensional (2D) and three-dimensional (3D) hybrid interfaces are important for achieving high performance, self-powered optoelectronic devices such as photodetectors. In this regard, herein, we designed and demonstrated a graphene/silicon (Gr/Si) (2D/3D) van der Waals (vdW) heterostructure for high-performance photodetectors, where graphene acts as an efficient carrier collector and Si as a photon absorption layer. The Gr/Si heterojunction exhibits superior Schottky diode characteristics with a barrier height of 0.76 eV and shows good performance as a self-powered detector, responding to 532 nm at zero bias. The self-powered photodetector functions under the mechanism of photovoltaic effect and exhibits responsivity as high as 510 mA W with a photo switching ratio of 10 and a response time of 130 μs. The high-performance vdW heterostructure photodetector demonstrated herein is attributed to the Schottky barrier that effectively prolongs the lifetime of photo-excited carriers, resulting in fast separation and transport of photoexcited carriers. The self-powered photodetector with superior light harvesting and carrier transport behaviour is expected to open a window for the technological implementation of Si-based monolithic optoelectronic devices.
CitationPeriyanagounder D, Gnanasekar P, Varadhan P, He J-H, Kulandaivel J (2018) High performance, self-powered photodetectors based on a graphene/silicon Schottky junction diode. Journal of Materials Chemistry C 6: 9545–9551. Available: http://dx.doi.org/10.1039/c8tc02786b.
SponsorsG. P. acknowledges DST-INSPIRE, Govt. of India for the Junior Research Fellowship award (DST INSPIRE-JRF IF#170198 DST/INSPIRE Fellowship/2016).
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry C