RT Journal Article SR Electronic T1 Ultrasensitive and ultrathin phototransistors and photonic synapses using perovskite quantum dots grown from graphene lattice JF Science Advances JO Sci Adv FD American Association for the Advancement of Science SP eaay5225 DO 10.1126/sciadv.aay5225 VO 6 IS 7 A1 Pradhan, Basudev A1 Das, Sonali A1 Li, Jinxin A1 Chowdhury, Farzana A1 Cherusseri, Jayesh A1 Pandey, Deepak A1 Dev, Durjoy A1 Krishnaprasad, Adithi A1 Barrios, Elizabeth A1 Towers, Andrew A1 Gesquiere, Andre A1 Tetard, Laurene A1 Roy, Tania A1 Thomas, Jayan YR 2020 UL http://advances.sciencemag.org/content/6/7/eaay5225.abstract AB Organic-inorganic halide perovskite quantum dots (PQDs) constitute an attractive class of materials for many optoelectronic applications. However, their charge transport properties are inferior to materials like graphene. On the other hand, the charge generation efficiency of graphene is too low to be used in many optoelectronic applications. Here, we demonstrate the development of ultrathin phototransistors and photonic synapses using a graphene-PQD (G-PQD) superstructure prepared by growing PQDs directly from a graphene lattice. We show that the G-PQDs superstructure synchronizes efficient charge generation and transport on a single platform. G-PQD phototransistors exhibit excellent responsivity of 1.4 × 108 AW–1 and specific detectivity of 4.72 × 1015 Jones at 430 nm. Moreover, the light-assisted memory effect of these superstructures enables photonic synaptic behavior, where neuromorphic computing is demonstrated by facial recognition with the assistance of machine learning. We anticipate that the G-PQD superstructures will bolster new directions in the development of highly efficient optoelectronic devices.