Cyclical plasma etching
First Claim
1. A method for cyclical plasma etching of a substrate that is received on a support within a process chamber in use, the method comprising a plurality of cycles that are effected by a controller, each cycle comprising the steps of:
- dosing a process chamber with a process gas via a dosing controller such that the substrate is exposed to a maximum dose of process gas of 1000 Langmuirs and said dose is controllable within an accuracy of 1 Langmuir; and
operating a first signal generator that is coupled to the process chamber and operating a second signal generator that is coupled to the support within the process chamber so as to cause bombardment of the substrate with positive ions from a plasma active species within the process chamber, wherein the substrate bombardment energy of the positive ions of the plasma active species is in the range of 10 eV to 100 eV which is controllable within an accuracy of 5 eV,wherein the method further comprises the step of vacuum pumping or purging the process chamber in between the steps of dosing and operating the first and second signal generators.
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Accused Products
Abstract
There is provided an apparatus for cyclical plasma etching of a substrate, the apparatus comprising: a process chamber; a support within the process chamber for receiving the substrate to be etched; a controller for repeatedly applying a dosing step and a bombardment steps respectively; a dosing controller for controlling the flow of a process gas in the dosing step such that the substrate is exposed to a maximum dose of process gas in use of 1000 Langmuirs and said dose is controllable within an accuracy of 1 Langmuir; and a first signal generator coupled to the process chamber and a second signal generator coupled to the support within the process chamber, the first and second signal generators being configured such that in use positions ions of an plasma active species within the process chamber have a substrate bombardment energy in the range of 10 eV to 100 eV which is controllable within an accuracy of 5 eV. There is also provided a method for cyclical plasma etching of a substrate using said apparatus.
10 Citations
9 Claims
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1. A method for cyclical plasma etching of a substrate that is received on a support within a process chamber in use, the method comprising a plurality of cycles that are effected by a controller, each cycle comprising the steps of:
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dosing a process chamber with a process gas via a dosing controller such that the substrate is exposed to a maximum dose of process gas of 1000 Langmuirs and said dose is controllable within an accuracy of 1 Langmuir; and operating a first signal generator that is coupled to the process chamber and operating a second signal generator that is coupled to the support within the process chamber so as to cause bombardment of the substrate with positive ions from a plasma active species within the process chamber, wherein the substrate bombardment energy of the positive ions of the plasma active species is in the range of 10 eV to 100 eV which is controllable within an accuracy of 5 eV, wherein the method further comprises the step of vacuum pumping or purging the process chamber in between the steps of dosing and operating the first and second signal generators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification