Apparatus with layered microwave window used in microwave plasma chemical vapor deposition process
First Claim
1. In an apparatus for the formation of a functional deposited film using microwave plasma chemical vapor deposition process comprising a substantially enclosed deposition chamber which is provided with a substrate supporting means, a raw material gas feeding means, an exhaust means and a window allowing transmission of microwaves from a microwave power source as a constituent wall member of the deposition chamber, the improvement which comprises a plurality of layers laminated concentrically in the center of the window and in the direction of microwave transmission, each of said layers comprising a microwave transmissible material having a specific inductive capacity of more than 1.0, whereby the laminated window acts as a microwave resonator and provides enhanced microwave transmission.
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Abstract
An improved apparatus for the formation of a functional deposited film using a microwave plasma chemical vapor deposition process characterized in that a microwave transmissible dielectric material is used for the microwave introducing window, and the window has a structure wherein the dielectric material is divided into blocks of the same or different dielectric materials having a specific inductive capacity of more than 1.0. In this way it is possible to adjust not only the resonant frequency characteristics but also the electromagnetic resonant mode of the window to resonate with the microwave oscillation frequency so as to enhance microwave transmission.
33 Citations
37 Claims
- 1. In an apparatus for the formation of a functional deposited film using microwave plasma chemical vapor deposition process comprising a substantially enclosed deposition chamber which is provided with a substrate supporting means, a raw material gas feeding means, an exhaust means and a window allowing transmission of microwaves from a microwave power source as a constituent wall member of the deposition chamber, the improvement which comprises a plurality of layers laminated concentrically in the center of the window and in the direction of microwave transmission, each of said layers comprising a microwave transmissible material having a specific inductive capacity of more than 1.0, whereby the laminated window acts as a microwave resonator and provides enhanced microwave transmission.
- 21. In an apparatus for the formation of a functional deposited film using microwave plasma chemical vapor deposition process comprising a substantially enclosed deposition chamber which is provided with a substrate supporting means, a raw material gas feeding means, an exhaust means and a window allowing transmission of microwave from a microwaves power source as a constituent wall member of the deposition chamber, the improvement which comprises a plurality of dielectric blocks being arranged in the center of said window to intersect with the electric lines of force of microwave transmission, each of said dielectric blocks having a small radius and comprising a microwave transmissible material having a specific inductive capacity of more than 1.0, whereby said window having said plurality of dielectric blocks acts as a microwave resonator and provides enhanced microwave transmission.
Specification