ZnO Nanoparticle/Graphene Hybrid Photodetectors via Laser Fragmentation in Liquid.

Kristin Charipar,Nicholas Charipar,Heungsoo Kim,Alberto Piqué

doi:10.3390/nano10091648

Kristin Charipar, Nicholas Charipar + Show 2 more

Open Access

https://doi.org/10.3390/nano10091648

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Journal: Nanomaterials	Publication Date: Aug 21, 2020
Citations: 20	License type: CC BY 4.0

Affiliation: United States Naval Research Laboratory

Abstract

By combining the enhanced photosensitive properties of zinc oxide nanoparticles and the excellent transport characteristics of graphene, UV-sensitive, solar-blind hybrid optoelectronic devices have been demonstrated. These hybrid devices offer high responsivity and gain, making them well suited for photodetector applications. Here, we report a hybrid ZnO nanoparticle/graphene phototransistor that exhibits a responsivity up to 4 × 104 AW−1 and gain of up to 1.3 × 105 with high UV wavelength selectivity. ZnO nanoparticles were synthesized by pulsed laser fragmentation in liquid to attain a simple, efficient, ligand-free method for nanoparticle fabrication. By combining simple fabrication processes with a promising device architecture, highly sensitive ZnO nanoparticle/graphene UV photodetectors were successfully demonstrated.

Highlights

Optoelectronic devices utilizing graphene have been studied extensively over the past decade, paving the way for the fabrication of thin, lightweight, highly efficient devices
To simplify the nanostructure fabrication process, we demonstrate the use of pulsed laser fragmentation in liquid (PLFL) as an alternative for nanoparticle generation
We begin with a zinc oxide (ZnO) particle powder dispersed in water and use PLFL to create smaller, more uniform nanoparticles

Summary

Introduction

Optoelectronic devices utilizing graphene have been studied extensively over the past decade, paving the way for the fabrication of thin, lightweight, highly efficient devices. By using nanoparticles instead of bulk ZnO thin films, the high surface-to-volume ratio provides a high density of hole trap states for charge transfer into the underlying graphene layer [14]. To simplify the nanostructure fabrication process, we demonstrate the use of pulsed laser fragmentation in liquid (PLFL) as an alternative for nanoparticle generation.

Results

Conclusion