Investigation of porosity effects in the photoluminescence and terahertz emission of electrochemically synthesized silicon nanostructures

  • Neil Irvin Fermin Cabello National Institute of Physics, University of the Philippines Diliman
  • Philippe Tingzon National Institute of Physics, University of the Philippines Diliman
  • Kerr Cervantes National Institute of Physics, University of the Philippines Diliman
  • Joybelle Lopez National Institute of Physics, University of the Philippines Diliman
  • Arven Cafe National Institute of Physics, University of the Philippines Diliman
  • Lorenzo Lopez, Jr. National Institute of Physics, University of the Philippines Diliman
  • Joselito Muldera Physics Department, De La Salle University
  • Arnel Salvador National Institute of Physics, University of the Philippines Diliman
  • Elmer Estacio National Institute of Physics, University of the Philippines Diliman
  • Armando Somintac National Institute of Physics, University of the Philippines Diliman

Abstract

We report increased visible luminescence and terahertz (THz) emission of various silicon (Si) nanostructures, namely porous Si (PS) and Si nanowires (NW). The NW were synthesized by one- and two-step metal-assisted chemical etching.The PS were fabricated using low and high etching current, resulting to low and high-porosity PS, respectively. From photoluminescence spectroscopy, broader and more intense luminescence were observed from the more porous sample in both PS and NW  sets. The inverse was observed THz emission of the samples, as probed by THz-time domain spectroscopy. These changes in the intensity of the two types of emitted radiation is attributed to increase in the surface states in the more porous samples.

Published
2017-06-07
How to Cite
[1]
N. I. Cabello, P. Tingzon, K. Cervantes, J. Lopez, A. Cafe, L. Lopez, J. Muldera, A. Salvador, E. Estacio, and A. Somintac. Investigation of porosity effects in the photoluminescence and terahertz emission of electrochemically synthesized silicon nanostructures, Proceedings of the Samahang Pisika ng Pilipinas 35, SPP-2017-PA-08 (2017). URL: https://paperview.spp-online.org/proceedings/article/view/238.
Section
Poster Session A (Materials Science, Instrumentation, and Photonics)