Patent ID: 8997686
Filing Date: 2015-04-07
Classification: C23C,G05D,Y10T

Abstract:
1. A system for delivering pulses of a desired mass of gas to a process chamber or tool, comprising: a gas delivery chamber; a first valve arranged so as to control the flow of gas into the gas delivery chamber; a second valve arranged so as control the flow of gas leaving the gas delivery chamber so that the gas can leave the gas delivery chamber in pulses, each of a selected mass as a function of the initial pressure of the gas in the gas delivery chamber; and a pressure control arrangement configured and arranged so as to control the pressure of the gas flowing into the gas delivery chamber so as to precharge the gas in the gas delivery chamber to a substantially-constant initial starting pressure set point prior to delivering each of the pulses of gas, such that variance in the starting pressure of the gas in the gas delivery chamber is controlled prior to delivering each of the pulses of gas, thus improving the repeatability of the mass delivery as a function of the duration of each of the pulses, wherein the pressure control arrangement includes an antechamber constructed and arranged so as to receive the gas and selectively coupled to provide the substantially-constant pressure gas supply through the first valve into the gas delivery chamber so as to control the variance of the initial pressure of the gas in the gas delivery chamber before delivery of each of the pulses of gas.