Open AccessStretchable photo sensor using perylene/graphene composite on ridged polydimethylsiloxane substrate
Author(s) -
Shawkat Ali,
Jinho Bae,
Chong Hyun Lee
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.030583
Subject(s) - materials science , polydimethylsiloxane , graphene , sheet resistance , indium tin oxide , perylene , optoelectronics , substrate (aquarium) , electrode , light intensity , composite number , flexible electronics , layer (electronics) , composite material , contact resistance , optics , nanotechnology , oceanography , physics , chemistry , geology , fluorescence
To apply in wearable electronics, we propose a stretchable photo sensor that detects an inversely changed resistance by varying light intensity, which is stably operated up to 25% axial strain. Especially, the stretchabity of the proposed photo sensor is achived by using a uniform ridged substrate made of polydimethylsiloxane (PDMS). The proposed device is composed of a thin film of perylene/graphene composite, which is sandwiched between bottom and top indium tin oxide (ITO) transparent electrodes fabricated through electro-hydrodynamic (EHD) technique. The electrical conductivity of perylene is improved by blending graphene with it. The resistance of the proposed photo sensor changes from 108 MΩ to 87 MΩ within the light intensity range of 0 to 400 lux, respectively. Furthermore, the flexibility is verified through a bendability test from 16 mm down to 0 mm and a bending endurance test for more than 1000 cycles. Uniform and smooth deposition of the active layer is tested through surface morphology characterization.