Patent ID: 8628618

Claim:
A vapor delivery system for supplying vapor to a chamber in a plasma-enhanced chemical vapor deposition (PECVD) system, comprising: a vapor supply that supplies vapor by vaporizing at least one liquid precursor in a carrier gas; a diverter including a first diverter valve that, when open, diverts the vapor away from the chamber, and a second diverter valve that, when open, supplies the vapor to the chamber; and a control module in communication with the vapor supply and the diverter and configured to: supply the carrier gas; after supplying the carrier gas, create plasma in the chamber while the substrate is in the chamber, open the first diverter valve, close the second diverter valve, and start supplying the vapor; and after a first predetermined period sufficient for the vapor to reach steady-state flow, close the first diverter valve and open the second diverter valve to supply the vapor to the chamber; after a second predetermined period following the first predetermined period, open the first diverter valve, close the second diverter valve and stop supplying the vapor; and after a third predetermined period following the second predetermined period, turn off the plasma.