Papers Published

1. Chen, S. and Lee, S.-T. and Braunstein, G. and Ko, K.-Y. and Zheng, L.R. and Tan, T.Y., Void formation and its effect on dopant diffusion and carrier activation in Si-implanted GaAs, Jpn. J. Appl. Phys. 2, Lett. (Japan), vol. 29 no. 11 (1990), pp. 1950 - 3 .
   (last updated on 2007/04/10)

   Abstract:
   GaAs samples, implanted with 220 keV Si to doses ranging from 3×10¹³ to 1×10¹⁵ cm^-2 and annealed at 850°C were studied. Using transmission electron microscopy (TEM), voids were found in samples with implant doses ⩾3×10¹⁴ cm^-2 after an annealing time as short as 5 s. In the same region where voids were found, capacitance-voltage measurements showed abnormally low electron concentrations. Also in the same region, secondary ion mass spectrometry (SIMS) measurements showed anomalies in the Si concentration profiles and required the interpretation that a Si redistribution process had occurred. At high Si implant doses, the onset of void formation, the abnormally low electron concentration, and the Si accumulation anomaly are concurrent. Based on these results, the authors conclude that voids inhibit the Si electrical activity and lead to the Si diffusion anomaly

   Keywords:
   annealing;diffusion in solids;electrical conductivity of crystalline semiconductors and insulators;gallium arsenide;III-V semiconductors;impurity distribution;ion implantation;secondary ion mass spectra;silicon;transmission electron microscope examination of materials;voids (solid);