Current-voltage characteristics of zinc oxide nanorods hydrothermally grown on a p-type silicon substrate

  • Raymund Curioso Veloz Materials Science and Engineering Program, University of the Philippines Diliman
  • Ma. Cecilia Moralde Angub Materials Science and Engineering Program, University of the Philippines Diliman
  • Horace Andrew Fernandez Husay National Institute of Physics, University of the Philippines Diliman
  • Erick John Carlo De Guzman Solibet National Institute of Physics, University of the Philippines Diliman
  • Melvin John Fernandez Empizo Institute of Laser Engineering, Osaka University
  • Keisuke Kawano Institute of Laser Engineering, Osaka University
  • Nobuhiko Sarukura Institute of Laser Engineering, Osaka University
  • Arnel Angud Salvador National Institute of Physics, University of the Philippines Diliman
  • Armando Soriano Somintac National Institute of Physics, University of the Philippines Diliman

Abstract

We present the current-voltage (I-V) characteristics of zinc oxide (ZnO) nanorods grown hydrothermally on a p-type silicon (Si) substrate. The vertically aligned hexagonal ZnO nanorods are synthesized directly on the substrate surface and have diameters and lengths of 390 to 570 nm and 1.15 µm, respectively. With good rectifying I-V behavior, the nanorods form a p-n junction with the Si substrate. When exposed to UV illumination, the p-Si/n-ZnO heterojunction also exhibits currents higher than without UV illumination resulting in an average contrast (photo-to-dark current) ratio of 1.21. Although the device fabrication still needs to be optimized to minimize the series resistance and ideality factor, our results suggest that similar heterojunction designs can be used for modern photodetector devices.

Published
2018-05-24
How to Cite
[1]
R. Veloz, M. C. Angub, H. A. Husay, E. J. C. Solibet, M. J. Empizo, K. Kawano, N. Sarukura, A. Salvador, and A. Somintac. Current-voltage characteristics of zinc oxide nanorods hydrothermally grown on a p-type silicon substrate, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-1G-03 (2018). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2018-1G-03.
Section
Condensed Matter and Materials Science