(Invited) Quantum Physics in Quantum Dots/Graphene Nanohybrids Broadband and Flexible Photodetectors

Colloidal semiconductor quantum dots/graphene (QD/Gr) heterojunction nanohybrids have recently emerged as a promising candidate for broadband photodetection. The QD/Gr nanohybrids are quantum sensors that take advantages of the quantum confinement in QDs for spectral tunability and that in graphene for superior charge mobility, leading to high photoconductive gains. Therefore, the QD/Gr nanohybrids provide a unique platform for design of broadband, flexible photodetectors that can have high quantum efficiency and hence high detectivity (D*) enabled by the strong quantum confinements in both QDs and graphene. This presentation highlights the recent progress made on QD/Gr nanohybrids broadband photodetection ranging from ultraviolet, to visible and infrared. The focus of the talk will be on understanding the quantum physics governing the performance of the QD/Gr nanohybrids photodetectors including noise, photoresponse, response speed and the figure of merit D*.