Lee, T. F. and Pashley, R. D. and McGill, T. C. and Mayer, J. W. (1975) Investigation of tellurium-implanted silicon. Journal of Applied Physics, 46 (1). pp. 381-388. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:20120810-105957103
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Hall and sheet−resistivity measurements as a function of temperature combined with layer removal have been used to study Si implanted with Te at energies up to 220 keV. At low doses (≲4×10^(12) cm^(−2)), Te has a donor level with a 140−meV activation energy. The activation energy decreases at higher Te doses and is approximately equal to zero for Te doses ≳10^(15) cm^(−2). At high dose levels, the number of conduction electrons per unit area N_s is more than an order of magnitude below the number of Te per unit area. High−temperature anneal treatments followed by quenching did not produce a substantial increase in N_s, suggesting that the formation of Te clusters was not responsible for the low value of N_s. Also, channeling measurements indicated a high substitutional fraction. Based on differential Hall measurements on samples implanted with phosphorus, with and without Si predamage, we conclude that residual radiation damage is not a major factor. A theoretical calculation, which includes the effect of decrease of activation energy with increasing impurity concentrations, indicated that the number of conduction electrons could be much less than the number of implanted Te even though the apparent activation energy is almost zero. Although the results of theoretical calculation do not give quantitative agreement with the experimental results, they do confirm the changes in apparent activation energy with concentration.
|Additional Information:||© 1975 American Institute of Physics. Received 6 August 1974. The authors wish to acknowledge Fred H. Eisen and Bryant M. Welch of Rockwell International Science Center for providing the Te-implanted samples. They also thank B. L. Crowder of IBM, Thomas J. Watson Research Center for doing variable energy P implants. Work supported in part by Air Force Cambridge Research Labs. (D.E. Davies). Work supported in part by Air Force Office of Scientific Research.|
|Subject Keywords:||ion implantation; silicon; tellurium ions; electric conductivity; hall effect; physical radiation effects; phosphorus ions; dose−response relationships; activation energy; doped materials; crystal doping; energy levels; carrier density|
|Classification Code:||PACS: 78.40.Fy; 61.72.U-; 71.35.-y|
|Official Citation:||Investigation of tellurium - implanted silicon T. F. Lee, R. D. Pashley, T. C. McGill, and J. W. Mayer, J. Appl. Phys. 46, 381 (1975), DOI:10.1063/1.321347|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Aucoeur Ngo|
|Deposited On:||10 Aug 2012 18:20|
|Last Modified:||26 Dec 2012 15:56|
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