4.7 Article

Charge transfer induced excitons and nonlinear optical properties of ZnO/PEDOT:PSS nanocomposite films

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.118901

Keywords

Semiconductor composites; Excitons; Charge transfer; Nonlinear optical properties; Conducting polymers

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Funding

  1. Science and Engineering Research Board (SERB), India [CRG/2018/002668]
  2. NIT Tiruchirappalli, India

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Zinc oxide nanorods were prepared using the sol-gel method, and composite films with a conducting polymer PEDOT:PSS were made by drop-casting. The study showed exciton dissociation and nonlinear optical properties, suggesting potential applications in optical switches and saturable absorbers.
In this current work, we have prepared zinc oxide (ZnO) nanorods by sol-gel method, and its composite films with a conducting polymer poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) also have been prepared by drop-casting method on the glass substrate. UV-Vis absorption and steady-state fluorescence studies revealed exciton dissociation and recombination at the interface of polymer chain and wide-bandgap semiconductor ZnO. Also, nonlinear optical properties of as-prepared nanocomposite films have been reported by employing an open aperture z-scan technique. A predominantly two-photon induced saturable absorption behavior, when excited with 532 nm, 10 ns laser pulses, appeared in nonlinear optical measurements. These results indicate that our as-synthesized composites can be useful in fabricating optical switch and saturable absorbers. (C) 2020 Elsevier B.V. All rights reserved.

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