Tony Low,1,2,3,*,† Michael Engel,1,4,† Mathias Steiner,4 and Phaedon Avouris1 1IBM T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, USA 2Department of Physics and Electrical Engineering, Columbia University, New York, New York 10027, USA 3Department of Electrical & Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA 4IBM Research-...

We report photoresponse measurements from two comparable epitaxial graphene (EG) devices of different thicknesses (2-layer vs. 10-layer EG) made on SiC substrates. An asymmetric metal contact scheme was used in a planar configuration to form a Ti/EG/Pd junction. By moving the laser illumination across the junction, we observed an increased photocurrent signal resulting from local enhancement of...

Polyaniline-functionalized graphene quantum dots (PANI-GQD) and pristine graphene quantum dots (GQDs) were utilized for optoelectronic devices. The PANI-GQD based photodetector exhibited higher responsivity which is about an order of magnitude at 405 nm and 7 folds at 532 nm as compared to GQD-based photodetectors. The improved photoresponse is attributed to the enhanced interconnection of GQD ...

Photonic structures have been attracting great attention as they the ability to manipulate photoresponse. Here, we report a hole array for effective photon trapping, therefore facilitating optoelectrical conversion of midwave infrared photodetector. The integrated device consists an InAsSb-based heterojunction photodiode and embedded symmetric penetrating through top wide bandgap layers into ab...

Vertical stacks of electrically confined quantum wires were demonstrated in devices with large areas. Multiple current plateaus and strong differential conductance oscillations were observed at above liquid nitrogen temperatures because of interlevel cascade transition of carriers. Our simulation results for charge transport, as well as interlevel infrared photoresponse red-shift, due to latera...

Single-crystalline Cd3P2 nanowires (NWs) have been synthesized via a solution-liquid-solid (SLS) mechanism. The lengths of the resulting nanowires can be effectively tuned in the range of 180 nm and 5 μm, and the photodetectors made of the Cd3P2 nanowires exhibited a pronounced photoresponse with high stability and reproducibility.

Composite films of chemically converted graphene (CCG) and water-soluble polythiophenes (P3TOPS and P3TOPA) were prepared by a LBL method using a suspension of negatively charged CCG-P3TOPS sheets and a solution of positively charged P3TOPA. The composite films show enhanced photoresponse due to photoinduced electron transfer from the polythiophenes to CCG.