Macquarie University
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ZnO-PEDOT: PSS nanocomposites as high-performance inorganic/organic hybrid UV photodetectors

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posted on 2024-07-10, 06:18 authored by Reza Behboodian

Three-dimensional (3D) ultraporous ZnO nanofilms have been the subject of intensive research as UV photodetectors driven by their large specific surface area, quantum confinement effect, and exceptional morphological connectivity. However, a poor interfacial connection between ZnO nanoparticles in these ultraporous nanostructures prevents the effective transfer of charge carriers across the interface, resulting in a drastic reduction in device sensitivity and electrical conductivity. To tackle this issue, we developed inorganic/organic hybrid nanocomposites made of highly porous ZnO nanofilms and poly (3,4-ethylenedioxythiophene)- polystyrene sulfonate (PEDOT: PSS) as highly robust, conductive UV photodetectors with fast response dynamics. A solid-state flame spray pyrolysis (FSP) method was employed to fabricate 3D ultraporous networks of ZnO nanoparticles on glass substrates having interdigitated electrodes with an average film porosity of >90%. The conductive PEDOT: PSS solution (with different polymer wt.%) was then drop-casted on the top of the ZnO nanostructure to fabricate the hybrid UV photodetectors. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and ultraviolet-visible (UV-Vis) spectroscopy were employed to study morphology, phase and crystal structure, chemical bonding and the optical performance of the fabricated structures. The optimised hybrid nanocomposite, with 0.025 wt.% polymer, featured a record-high UV photogenerated current of 617 μA under a low applied voltage of 1V and a wavelength of 375 nm. These results provide a high-performance hybrid for the low-cost production and implementation of UV photodetectors in complementary metal-oxide-semiconductor (CMOS) portable devices.


Table of Contents

1: Introduction -- 2. Background and literature review -- Experimental section -- 4. Results and discussion -- 5. Conclusions and future work -- References -- Appendix I -- Appendix II - Responsivity values of samples recorded under varied wavelengths -- Appendix III - Response and recovery times for all samples

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


Master of Research

Department, Centre or School

Department of Engineering

Year of Award


Principal Supervisor

Noushin Nasiri

Additional Supervisor 1

Darren Bangall


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