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Download fileTransient and Flexible Photodetectors
journal contribution
posted on 2018-08-27, 00:00 authored by Shih-Yao Lin, Golam Haider, Yu-Ming Liao, Cheng-Han Chang, Wei-Ju Lin, Chen-You Su, Yi-Rou Liou, Yuan-Fu Huang, Hung-I Lin, Tai-Chun Chung, Tai-Yuan Lin, Yang-Fang ChenWith
the rapid development of technology, electronic devices have
become omnipresent in our daily life as they have brought much convenience
in every aspect of human activity. Side-by-side, electronic waste
(e-waste) has become a global environmental burden creating an ever-growing
ecological problem. The transient device technology in which the devices
can physically disappear completely in different environmental conditions
has attracted widespread attention in recent years owing to its emerging
application potential spanning from biomedical to military use. In
this work, we demonstrated the first attempt for a dissolvable ecofriendly
flexible photodetector using a hybrid of graphene and chlorophyll
on a poly(vinyl alcohol) substrate. The whole device can physically
disappear in aqueous solutions in a time span of ∼30 min, while
it shows a photoresponsivity of ∼200 A W–1 under ambient conditions. The high carrier mobility of graphene
and strong absorption strength of a green photon harvesting layer,
chlorophyll, result in the photocurrent gain of the device as high
as 103 with subsecond response time under the illumination
of red light. The newly designed photodetector shown here yields zero
waste with a minimum impact on the environment, which is very useful
for the development of the sustainability of our planet.