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      Synthesis of ultra-small Si / Ge semiconductor nano-particles using electrochemistry

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      Author
      Alkis, S.
      Ghaffari, M.
      Okyay, Ali Kemal
      Date
      2012
      Source Title
      Materials Chemistry and Physics
      Print ISSN
      0254-0584
      Publisher
      Elsevier
      Volume
      134
      Issue
      2-3
      Pages
      616 - 622
      Language
      English
      Type
      Article
      Item Usage Stats
      131
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      Abstract
      In this paper, we describe the formation of colloidal Si/Ge semiconductor nano-particles by electrochemical etching of Ge quantum dots (GEDOT), Silicon-Germanium graded layers (GRADE) and Silicon-Germanium multi-quantum well (MQW) structures which are prepared on Silicon wafers using low pressure chemical vapor deposition (LPCVD) technique. The formation of Si/Ge nano-particles is verified by transmission electron microscope (TEM) images and photoluminescence (PL) measurements. The Si/Ge nano-particles obtained from GEDOT and GRADE structures, gave blue emissions, upon 250 nm, and 300 nm UV excitations. However, the nano-particles obtained from the MQW structure did exhibit various color emissions (orange, blue, green and red) upon excitation with 250 nm, 360 nm, 380 nm and 400 nm wavelength light.
      Keywords
      Electrochemical techniques
      Electron microscopy (STEM, TEM, SEM)
      Nanostructures
      Photoluminescence spectroscopy
      Blue emission
      Color emission
      Electrochemical techniques
      Ge quantum dot
      Graded layers
      Multiquantum wells
      Photoluminescence measurements
      Si/Ge
      Silicon germanium
      Transmission electron microscope
      Ultra-small
      UV excitation
      Germanium
      Nanoparticles
      Nanostructures
      Photoluminescence spectroscopy
      Semiconductor quantum dots
      Silicon wafers
      Transmission electron microscopy
      Semiconductor quantum wells
      Permalink
      http://hdl.handle.net/11693/21434
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.matchemphys.2012.03.040
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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