Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 1, Pages 1308-1316Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03875
Keywords
stretchable photodetectors; electrospinning; perovskite; nanofibers; composites
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [NRF2019R1C1C1005129, NRF-2019R1C1C1004104, NRF2020R1A4A3079923]
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Polymer/lead halide perovskite composites have great potential for wearable optoelectronic devices, with their thin and stretchable nanostructures providing high photocurrents and excellent mechanical behavior.
Polymer/lead halide perovskite composites are a promising platform for wearable optoelectronic devices. In particular, one-dimensional nanocomposites are considered core materials for solar energy conversion textiles and optical sensors. Herein, we designed stretchable photodetectors incorporating thin and uniform polymer/perovskite composite nanofibers produced by electrospinning of a polymer/perovskite precursor solution. During the reaction of precursors in the as-spun nanofiber, protruding perovskite nanoplates on the fiber surface and embedded nanoparticles within the fiber were formed, showing double photoluminescence emissions. Furthermore, the mechanical behavior of the nanofibers on a rubbery substrate strongly depends on their orientation angle (alpha) with respect to the applied tensile force. As a decreases, the loaded stress is significantly reduced, which contributes to a stretchability of up to 15% strain for any orientation. The excellent percolation of perovskite nanoparticles leads to high photocurrents under green and red light illumination. At 15% strain, the responsivity and detectivity of the stretchable photodetector at lambda = 550 nm were 51.2 mA W-1 and 2.23 x 10(11) Jones, respectively. The device performance was well retained during mechanical deformation and stability tests. This thin and stretchable device was also applied to a wearable photodetector to demonstrate its great potential as a wearable image sensor.
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