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Highly Flexible Organic Nanofiber Phototransistors Fabricated on a Textile Composite for Wearable Photosensors

Author(s)
Lee, Moo YeolHong, JayeonLee, Eun KwangYu, HojeongKim, HyoeunLee, Jea UkLee, WonohOh, Joon Hak
Issued Date
2016-03
DOI
10.1002/adfm.201503230
URI
https://scholarworks.unist.ac.kr/handle/201301/18935
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201503230/abstract;jsessionid=3D34A99EAC333E685AB1BCDC98493064.f04t04
Citation
ADVANCED FUNCTIONAL MATERIALS, v.26, no.9, pp.1445 - 1453
Abstract
Highly flexible organic nanofiber phototransistors are fabricated on a highly flexible poly(ethylene terephthalate) (PET) textile/poly(dimethylsiloxane) (PDMS) composite substrate. Organic nanofibers are obtained by electrospinning, using a mixture of poly(3,3 '''-didodecylquarterthiophene) (PQT-12) and poly(ethylene oxide) (PEO) as the semiconducting polymer and processing aid, respectively. PDMS is used as both a buffer layer for flattening the PET textile and a dielectric layer in the bottom-gate bottom-contact device configuration. PQT-12: PEO nanofibers can be well-aligned on the textile composite substrate by electrospinning onto a rotating drum collector. The nanofiber phototransistors fabricated on the PET/PDMS textile composite substrate show highly stable device performance (on-current retention up to 82.3 (+/- 6.7)%) under extreme bending conditions, with a bending radius down to 0.75 mm and repeated tests over 1000 cycles, while those prepared on film-type PET and PDMS-only substrates exhibit much poorer performances. The photoresponsive behaviors of PQT-12: PEO nanofiber phototransistors have been investigated under light irradiation with different wavelengths. The maximum photoresponsivity, photocurrent/dark-current ratio, and external quantum efficiency under blue light illumination were 930 mA W-1, 2.76, and 246%, respectively. Furthermore, highly flexible 10 x 10 photosensor arrays have been fabricated which are able to detect incident photonic signals with high resolution. The flexible photosensors described herein have high potential for applications as wearable photosensors
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1616-301X
Keyword
THIN-FILM TRANSISTORSFIELD-EFFECT TRANSISTORSGATE DIELECTRICSPOLYMER FIBERSELECTROSPUN NANOFIBERSBIOLOGICAL SENSORSOPTICAL-PROPERTIESHIGH-MOBILITYGAS SENSORSPERFORMANCE

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