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Non-Radiative Competition in the Excitation of Erbium Implanted Silicon Light Emitting Devices

  • T Taskin (a1), Q Huda (a1), A Scholes (a1), J H Evans (a1), A R Peaker (a1), P Hemment (a2), C Jeynes (a2) and Z Jafri (a2)...

Abstract

This paper reports a study of the non-radiative processes competing with the excitation of the erbium ion in layers implanted with high concentrations of erbium and oxygen. These processes reduce the luminescence efficiency of the Si:Er system and dramatically increase the threshold current density calculated to be necessary for an ultimate goal, the Si/Ge:Er LASER. Using cross sectional TEM, photoluminescence as a function of temperature and DLTS, it is demonstrated that a two stage anneal procedure which avoids the formation of extended defects and removes specific deep states is necessary to obtain efficient Er3+ excitation at high erbium concentrations. Comparisons are made with damage resulting from germanium implantation into silicon. The role of multiple stage anneals is discussed in relation to the removal of Shockley-Hall-Read recombination centres

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