Non-intrusive plasma diagnostics for the deposition of large area thin film silicon

Plasma diagnostics for large area, industrial RF parallel-plate reactors can be useful for process optimization and monitoring, provided that their implementation is practical and non-intrusive. For instance, Fourier transform infrared (FTIR) absorption spectroscopy and/or time-resolved optical emission spectroscopy (OES) can easily be retro-fitted into the pumping line of a reactor. Both techniques were used to measure the fractional depletion of silane in silane/hydrogen plasmas. By means of a simple analytical plasma chemistry model, it is shown that the silane depletion is related to the silicon thin film properties such as microcrystallinity. Uses of the diagnostics are demonstrated by two examples: (i) the optimal plasma parameters for high deposition rate of microcrystalline silicon, along with efficient gas utilization, are shown to be high input concentration and strong depletion of silane; and (ii) the optimal reactor design, in terms of fast equilibration of the plasma chemistry, is shown to be a closed, directly-pumped showerhead reactor containing a uniform plasma. (C) 2009 Elsevier B.V. All rights reserved.


Published in:
Thin Solid Films, 517, 23, 6218-6224
Presented at:
6th Symposium on Thin Films for Large Area Electronics held at the E-MRS Spring Meeting, Strasbourg, France, May 26-30, 1008
Year:
2009
Publisher:
Elsevier
ISSN:
0040-6090
Keywords:
Laboratories:
SPC
CRPP




 Record created 2010-05-19, last modified 2018-06-03


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