Temperature-modulated Si(001):As gas-source molecular beam epitaxy: Growth kinetics and As incorporation

H. Kim, G. Glass, J. A.N.T. Soares, Y. L. Foo, P. Desjardins, J. E. Greene

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Arsenic doping at concentrations CAs ≳ 1018 cm-3 during Si(001) growth from hydride precursors gives rise to strong As surface segregation, low film growth rates RSi, poor electrical activation, and surface roughening. Based upon the results of temperature-programmed desorption studies of Si(001):As surface processes during film deposition, we have investigated the use of temperature-modulated growth including periodic arsenic desorption (10 s at 1000 °C) from the surface segregated layer. Both constant-temperature and temperature-modulated Si(001):As layers were grown at Ts=750 °C, selected as a compromise between maximizing CAs and providing a usable deposition rate, by gas-source molecular beam epitaxy from Si2H6/AsH3 mixtures. For constant-temperature growth, RSi is only 0.08 μmh-1, the fraction of electrically active dopant is 55%, and film surfaces are very rough (rms roughness 〈w〉 = 110 A°). In sharp contrast, Ts-inodulated layers exhibit increases in RSi by 2.5× to 0.20 μm h-1, 100% electrical activity, and atomically smooth surfaces with 〈w〉 = 2 Å. The results are explained based upon the competition among As surface segregation, desorption, and incorporation rates.

Original languageEnglish
Pages (from-to)3263-3265
Number of pages3
JournalApplied Physics Letters
Volume79
Issue number20
DOIs
Publication statusPublished - 2001 Nov 12

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Temperature-modulated Si(001):As gas-source molecular beam epitaxy: Growth kinetics and As incorporation'. Together they form a unique fingerprint.

  • Cite this