PL EN


Preferences help
enabled [disable] Abstract
Number of results
2016 | 28 | 29-40
Article title

Theoretical model to determine the Porosity and refractive index of porous silicon type-n by using Atomic force microscope

Content
Title variants
Languages of publication
EN
Abstracts
EN
Porous silicon (PS) layer was produced by photochemical etching process at (5, 7, 10, 12 and 15) etching time and 7 mA/cm2 current density then after investigation by Atomic Force Microscope (AFM) the thickness of PS layer from about 3.4 µm to 15.8 µm was determined. The surface of porous silicon is formed from small pyramids with porous structure, where the porosity of n-PS is from ≈ (32-72%). Porous silicon layer formed on the silicon substrates by photochemical etching contains also the nanopores with diameter about (16.41-42) nm in current density (7mA/cm2). The porosity and thickness was determined from AFM results and compared with the result from the usually measured porosity and thickness through a gravimetric method we found that the values of porosity and thickness calculated from two methods are approximately similar to each other with few difference, the influence of structure changes on optical properties such as refractive index, which decreases exponentially with porosity.
Discipline
Year
Volume
28
Pages
29-40
Physical description
Contributors
  • Basic Science Department, University of Al- Kufa, Najaf, Iraq
author
  • Physics Department, Science Faculty, University of Al- Mustansiriyah, Baghdad, Iraq
  • Physics Department, Science Faculty, University of Al- Mustansiriyah, Baghdad, Iraq
References
  • [1] R.J. Žvalioniene, V. Grigaliunas, S. Tamulevièius, Fabrication of porous silicon microstructures using electrochemical etching. Materials Science (Medžiagotyra) 9(4) (2003) 1392-1320.
  • [2] S.H. Mohameda, E.R. Shaabanb, Investigation of the refractive index and dispersion parameters of tungsten ox nitride thin films. Materials chemistry and Physics 121 (2010) 249-253.
  • [3] Park J.H., Gu L., von Maltzahn G., Ruoslahti E., Bhatia S.N., Sailor M.J., Biodegradable luminescent porous silicon nanoparticles for in vivo applications. Nat. Mater. 8 (2009) 331-336.
  • [4] Ferrari, M. Cancer nanotechnology: opportunities and challenges. Nat. Rev. Cancer, 5 (2005) 161-171.
  • [5] Bharali D.J., Khalil M., Gurbuz M., Simone T.M., Mousa A.S., Nanoparticles and cancer therapy: A concise review with emphasis on dendrimers. Int. J. Nanomed, 4 (2009) 1-7.
  • [6] Popp U., Herbig R., Michel G., Müller E., Oestreich C., Properties of Nanocrystalline Ceramic Powders Prepared by Laser Evaporation and Recondensation. J. Eur. Ceram. Soc., 18 (1998) 1153-1160.
  • [7] H.S. Tamboli, V. Puri, R.K. Puri, R.B. Patil, M.F. Luo,Comparative study of physical properties of vapor chopped and nonchopped Al2O3 thin films. Materials Research Bulletin 46 (2011) 815-819.
  • [8] Kelly, P.J.; Arnell, R.D., Magnetron sputtering: a review of recent developments and applications. Vacuum, 56 (2000) 159-172.
Document Type
article
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.psjd-a2c624a1-3bf0-428d-8379-136a108bc4c7
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.