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    • Keywords


      Porous silicon; passivation; palladium; oxidation; XPS.

    • Abstract


      Nano porous silicon (PS) was formed on 𝑝-type monocrystalline silicon of 2–5 𝛺 cm resistivity and (100) orientation by electrochemical anodization method using HF and ethanol as the electrolytes. High density of surface states, arising due to its nano structure, is responsible for the uncontrolled oxidation in air and for the deterioration of the PS surface with time. To stabilize the material PS surface was modified by a simple and low cost chemical method using PdCl2 solution at room temperature. X-ray photoelectron spectroscopy (XPS) was performed to reveal the chemical composition and the relative concentration of palladium on the nanoporous silicon thin films. An increase of SiO2 formation was observed after PdCl2 treatment and presence of palladium was also detected on the modified surface. 𝐼–𝑉 characteristics of Al/PS junction were studied using two lateral Al contacts and a linear relationship was obtained for Pd modified PS surface. Stability of the contact was studied for a time period of around 30 days and no significant ageing effect could be observed.

    • Author Affiliations


      J Kanungo1 L Selegård2 C Vahlberg2 K Uvdal2 H Saha1 S Basu1

      1. IC Design and Fabrication Centre, Department of Electronics and Telecommunications Engineering, Jadavpur University, Kolkata 700 032, India
      2. Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
    • Dates

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

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