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Title: Improving the Responsivity of Hybrid Graphene-Conductive Polymer Photodetectors via Nanowire Self-Assembly

Journal Article · · ACS Photonics

Here, by changing the morphology of a poly(3-hexylthiophene) (P3HT) conductive polymer via self-assembly from a planar thin film to a nanowire mesh mesostructure, we demonstrate hybrid graphene–conductive polymer photodetectors with an experimentally observed 600% improved photoresponsivity when compared to their analogous hybrid photodetectors based on graphene and a planar P3HT thin film of similar thickness. We present at least two reasons that stand behind such a dramatic increase in photoresponsivity: (i) the polymer nanowire mesh architecture with unit cell dimensions comparable to the wavelength of light, which produces light scattering and increased light absorption in the polymer compared to the case of a planar polymer thin film of similar thickness, and (ii) the crystallization of P3HT molecules within the nanowires reduces the density of charge trap states, which in turn provides improved charge transport and charge transfer compared to a P3HT thin film.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1478478
Report Number(s):
BNL-209317-2018-JAAM
Journal Information:
ACS Photonics, Vol. 5, Issue 11; ISSN 2330-4022
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Figures / Tables (6)