Measurement of lateral dopant diffusion in rapid thermal annealed W-polycide gate structures

T. Schiml, J. Bevk, M. Furtsch, G. E. Georgiou, R. Cirelli, W. M. Mansfield, P. J. Silverman, H. S. Luftman

Research output: Contribution to journalConference articlepeer-review

Abstract

Lateral dopant diffusion is a well known problem in dual-gate W-polycide CMOS devices. We have recently demonstrated that RTA processing helps to alleviate this problem and at the same time ensures sufficient dopant activation. However, due to the complex micro-structural changes in both poly-Si and WSix (x approx. 2.5) layers during the RTA process, the time dependence of the diffusion processes and dopant distribution are difficult to predict. Consequently, the process optimization and device simulations are rather unreliable. We describe a new experimental technique to measure lateral dopant diffusion and 2-dimensional dopant distribution in RTA processed W-polycide structures using conventional SIMS analysis of lithographically defined test structures. Our experiments show that the technique is capable of measuring lateral dopant diffusion over distances between one and tens of microns without losing the vertical resolution of conventional SIMS profiling. The technique can be used to study diffusion processes in a variety of materials and multi-layer structures.

Original languageEnglish (US)
Pages (from-to)121-126
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume429
DOIs
StatePublished - Jan 1 1996
Externally publishedYes
EventProceedings of the 1996 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 8 1996Apr 12 1996

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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