Papers by Katherine Saenger
Academic and Research Staff Prof. D. Kleppner, Prof. DE Pritchard, Dr. R. Ahmad-Bitar2 5 , Dr. D.... more Academic and Research Staff Prof. D. Kleppner, Prof. DE Pritchard, Dr. R. Ahmad-Bitar2 5 , Dr. D. Derouard2 5 Dr. T. Ducas25, Dr. RG Hulet, Dr. G. Lafyatis, Dr. P. Moskowitz, Dr. JL. Picque2 5 ... V. Bagnato, PP Chang, R. Fianagan, T. Gentile, PL Gould, E. Hilfer, BJ Hughey, MM ...
Journal of Applied Physics, 1991
MRS Proceedings, 1995
A detailed in situ study of silicide reactions during rapid thermal annealing of patterned struct... more A detailed in situ study of silicide reactions during rapid thermal annealing of patterned structures was performed to determine the effects of linewidth (0.2 to 1.1 μm), dopants (arsenic, boron or phosphorus) and silicon substrate type (poly-Si or <100>-Si) on the C49 to C54-TiSi2 transformation. A synchrotron x-ray source and a high speed position sensitive detector were used to collect x-ray diffraction patterns of the reacting phases on a millisecond time scale, in situ, during annealing. We demonstrate that most patterned C49-TiSi2 structures (0.2 to 1.1 μm in width, 2 to 4 μm2 in area) will incompletely transform into C54-TiSi2 during rapid thermal annealing. The C49 to C54 transformation ends at about 900°C and further annealing to higher temperatures does not force the remaining C49 to transform into C54. We also observed…
Laser Material Processing for Solar Energy, 2012
Applications for laser patterning in Si photovoltaics include (i) patterning SiO2 or SiN layers w... more Applications for laser patterning in Si photovoltaics include (i) patterning SiO2 or SiN layers with openings for local contacts and (ii) laser-doped selective emitter (LDSE) processes, in which the contact open is accompanied by the diffusion of dopants into a locally melted Si area. While contact open processes are best performed with UV wavelengths that can be strongly absorbed by the SiN or SiO2 (allowing layer ablation with a minimum of Si heating), the Si melt depth required by LDSE requires irradiation at longer laser wavelengths where these antireflection coatings (ARCs) no longer absorb well. An optimized LDSE process must thus produce Si melting as well as the least amount of Si vaporization sufficient to lift off the overlying ARC. In this work, we investigate the mechanisms for lifetime degradation in Si(p-type, 100-oriented)/ARC samples resulting from 20 ns pulsed laser irradiation at 532 nm at fluences near the threshold for ARC removal. To differentiate between lifetime degradation induced by changes in the passivation layer vs. changes in the Si itself, samples were lifetime mapped after patterned laser irradiation and then again after a wet ARC strip and repassivation. Samples with ARCs of thermal SiO2 and PECVD SiN typically showed some residual Si damage after irradiation at fluences sufficient for contact open. Interestingly, irradiation of the SiO2 samples at lower fluences, between the threshold for Si melting and ARC removal, showed damage to the SiO2 passivation, but no residual Si damage. Explanations for these observations and related results will be discussed.
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Papers by Katherine Saenger