Organic-Inorganic Heterointerfaces for Ultrasensitive Detection of Ultraviolet Light.
The performance of graphene field-effect transistors is limited by the drastically reduced carrier mobility of graphene on silicon dioxide (SiO2) substrates. Here we demonstrate an ultrasensitive ultraviolet (UV) phototransistor featuring an organic self-assembled monolayer (SAM) sandwiched between an inorganic ZnO quantum dots decorated graphene channel and a conventional SiO2/Si substrate. Remarkably, the room-temperature mobility of the chemical-vapor-deposition grown graphene channel on the SAM is an order-of-magnitude higher than on SiO2, thereby drastically reducing electron transit-time in the channel. The resulting recirculation of electrons (in the graphene channel) within the lifetime of the photogenerated holes (in the ZnO) increases the photoresponsivity and gain of the transistor to ∼10(8) A/W and ∼3 × 10(9), respectively with a UV to visible rejection ratio of ∼10(3). Our UV photodetector device manufacturing is also compatible with current semiconductor processing, and suitable for large volume production.
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Dali
D
Shao
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Jian
J
Gao
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Philippe
P
Chow
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Hongtao
H
Sun
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Guoqing
G
Xin
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Prachi
P
Sharma
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Jie
J
Lian
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Nikhil A
NA
Koratkar
†Department of Electrical, Computer, and Systems Engineering, ‡Department of Materials Science and Engineering, and §Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
Shayla
S
Sawyer
D006108:Graphite / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry*; D012666:Semiconductors; D012822:Silicon Dioxide / Q000737:chemistry*; D014466:Ultraviolet Rays; D015034:Zinc Oxide / Q000737:chemistry*
D012822:Silicon Dioxide; D006108:Graphite; D015034:Zinc Oxide
Ultraviolet photodetector; ZnO quantum dots; gain; graphene; heterointerface