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.