PLASMA ETCH REACTOR AND METHOD

摘要

A plasma etch reactor (20) includes an upper electrode (24), a lower electrode (28), a peripheral ring electrode (26) disposed therebetween. The upper electrode (24) is grounded, the peripheral electrode (26) is powered by a high frequency AC power supply, while the lower electrode (28) is powered by a low frequency AC power supply, as well as a DC power supply. The reactor chamber (22) is configured with a solid source (50) of gaseous species and a protruding baffle (40). A nozzle (36) provides a jet stream of process gases in order to ensure uniformity of the process gases at the surface of a semiconductor wafer (48). The configuration of the plasma etch reactor (20) enhances the range of densities for the plasma in the reactor (20), which range can be selected by adjusting more of the power supplies (30, 32).