Method for monitoring the boron content of borophosphosilicate

Details Method for monitoring the boron content of borophosphosilicate Method for monitoring the boron content of borophosphosilicate

1994-04-04

1995-08-15

Housel, James C.

Chemistry: analytical and immunological testing

Hydrogen, per se

436163, 436 52, 436 53, 422 81, 422105, 422108, 422110, 422111, G01N 3506

Patent

active

054418933

ABSTRACT:
A method for monitoring the boron content of the borophosphosilicate, BPSG. The BPSG is obtained by the oxidation of silane, of diborane and of phosphine in a reactor, starting with a first, diborane/silane gas mixture and a second, phosphine/silane gas mixture by monitoring the ratio .rho.=diborane/(diborane+silane) of the mixture resulting from the mixing of the first and second gas mixtures. Monitoring of the boron content is obtained by measuring the density of the first mixture, determining the amount of residual hydrogen in the first mixture and modulating the mass flow rate of the first mixture in response to the calculated ratio .rho..

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