Optimized external IR reflection spectroscopy for quantitative determination of borophosphosilicate glass parameters
- Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185-0342 (United States)
Infrared (IR) external reflection spectroscopy has been optimized for the quantitative determination of composition and film thickness of borophosphosilicate glass (BPSG) deposited on silicon wafer substrates. The precision of the partial least-squares calibrations for boron and phosphorus contents and thin-film thickness were measured as the cross-validated standard error of prediction statistic. The results showed that BPSG IR reflection spectra collected over a wide range of incident IR radiation angles (15{degree}, 25{degree}, 45{degree}, and 60{degree}) can be used for the simultaneous quantification of these three BPSG parameters. When high angles of incidence were employed, the measurement was found to be more sensitive to small errors in the angle of incidence. The polarization state of the incident IR radiation did not noticeably affect the prediction of the three calibrated BPSG parameters. The results achieved in this study provide guidelines for at-line process monitoring and quality control of BPSG thin films used in the fabrication of microelectronic devices. {copyright} {ital 1997} {ital Society for Applied Spectroscopy}
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 503580
- Journal Information:
- Applied Spectroscopy, Vol. 51, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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