Flexible and passive photo sensor based on perylene/graphene composite

Graphene-based composites represent a new class of materials with potential for many electronic applications. Especially, any polymer's property can be tuned by attaching it to graphene. In this paper, we propose a passive photo sensor based on a single layer of perylene/graphene composite, which is deposited in comb type silver electrodes separated as 50 mu m spacing. The electrical conductivity of perylene is increased by blending with graphene. Photo sensing layer (120 nm thick) and Silver electrodes (50 mu m width and 350 nm thick) are deposited on poly( ethylene terephthalate) (PET) substrate through electro-hydrodynamic (EHD) system, which is cost effective, environmentally friendly, and non-vacuum e-printing technology. The proposed photo sensor detects a terminal resistance inversely varied by an incident light in the range between 78 G Omega in dark and 25 GSZ at light intensity of 400 lux. The device response is maximum on wavelength range 465-535 nm at blue light. The device exhibited bendability up to 4 mm diameter for 1000 endurance cycles. The surface morphology analysis is carried out with FE-SEM and microscope. (C) 2015 Elsevier B.V. All rights reserved.