• About
  • Policies
  • What is open access
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      XPS for probing the dynamics of surface voltage and photovoltage in GaN

      Thumbnail
      View / Download
      1.5 Mb
      Author(s)
      Sezen, H.
      Özbay, Ekmel
      Süzer, Şefik
      Date
      2014-12-30
      Source Title
      Applied Surface Science
      Print ISSN
      0169-4332
      Electronic ISSN
      1873-5584
      Publisher
      Elsevier
      Volume
      323
      Pages
      25 - 30
      Language
      English
      Type
      Article
      Item Usage Stats
      215
      views
      223
      downloads
      Abstract
      We describe application of two different data gathering techniques of XPS for probing the dynamics of surface voltage and surface photovoltage (SPV) developed in microseconds to seconds time-domain, in addition to the conventional steady-state measurements. For the longer (seconds to milliseconds) regime, capturing the data in the snapshot fashion is used, but for the faster one (down to microseconds), square wave (SQW) electrical pulses at different frequencies are utilized to induce and probe the dynamics of various processes causing the surface voltage, including the SPV, via the changes in the peak positions. The frequency range covers anywhere from 10(-3) to 10(5) Hz for probing changes due to charging (slow), dipolar (intermediate), and electronic (fast) processes associated with the external stresses imposed. We demonstrate its power by application to n- and p-GaN, and discuss the chemical/physical information derived thereof. In addition, the method allows us to decompose and identify the peaks with respect to their charging nature for a composite sample containing both n- and p-GaN moieties.
      Keywords
      Charging Dynamics
      Surface Photovoltage
      XPS
      GaN
      Doping
      Permalink
      http://hdl.handle.net/11693/12459
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.apsusc.2014.06.089
      Collections
      • Department of Chemistry 677
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2484
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCoursesThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCourses

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 2976
      © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy