Abrasive finishing with lubricant and tracking
AssigneeBeaver Creek Concepts Inc
InventorCharles J. Molnar
Life of this patent
Estimating the term…
Abstract
A method of using a finishing element having an abrasive finishing surface including organic lubricant for finishing semiconductor wafers is described. The organic lubricants with preferred in situ control can improve control of the coefficient of friction and help reduce unwanted defects. The method uses finishing control subsystem having a multiplicity of operative process sensors along with tracked information to improve in situ control of finishing. Differential lubricating film methods are described to differentially finish semiconductor wafers. Planarization and localized finishing can be improved using differential lubricating boundary layer methods of finishing with improved real time control.
Claims26
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface and a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing an organic lubricant to an operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least three operative process sensors which include a plurality of operative friction sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in the operative finishing interface forming in the operative finishing interface a uniform region having an organic lubrication and wherein the uniform region has a coefficient of friction;
- and
- changing a plurality of control parameters in response to an evaluation of both the in situ process information sensed with the at least three operative process sensors and the tracked information and wherein changing the control parameters changes the coefficient of friction in the uniform region having the organic lubrication during at least a portion of the finishing cycle time.
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface having a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing an organic lubricant to an operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least three operative process sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in an operative finishing interface forming in the operative finishing interface a first uniform region having a first organic lubrication and a second uniform region having a second organic lubrication and wherein the first and the second uniform regions have different coefficients of friction;
- and
- changing a plurality of control parameters in response to an evaluation of both the in situ process information sensed with the at least three operative process sensors and the tracked information, wherein changing the control parameters changes the coefficient of friction in the first uniform region during at least a portion of the finishing cycle time.
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface and a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing an organic lubricant to the operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least three operative process sensors including at least two operative friction sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in an operative finishing interface forming in the operative finishing interface a first uniform region having a first organic lubrication and a second uniform region having a second organic lubrication and wherein the first and the second uniform regions have different coefficients of friction;
- evaluating both the in situ process information sensed with the at least three operative process sensors and the tracked information;
- and
- changing a plurality of control parameters at least 4 times to change the coefficient of friction in at least the first uniform region at least 4 times during the finishing cycle time.
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface and at least one uniform region and a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing a reactive lubricant to the operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least three operative process sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in the operative finishing interface forming a coefficient of friction in a uniform region having a reactive lubrication;
- and
- evaluating both the in situ process information sensed with the at least three operative process sensors and the tracked information;
- and
- changing a plurality of control parameters at least 10 times to change the coefficient of friction at least 4 times during the finishing cycle time in at least one uniform region having the reactive lubrication.
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface and a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing a finishing aid to an operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least three operative process sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in the operative finishing interface forming a coefficient of friction in a uniform region of the semiconductor wafer surface having the finishing aid;
- and
- evaluating both the in situ process information sensed with the at least three operative process sensors and the tracked information;
- and
- changing with the finishing control subsystem a plurality of control parameters to change finishing at least 4 times during at least a portion of the finishing cycle time.
A method of finishing a tracked semiconductor wafer having a semiconductor wafer surface and a finishing cycle time, the method comprising the steps of:
- providing the tracked semiconductor wafer having tracked information;
- providing an abrasive finishing element finishing surface;
- providing an organic lubricant to the operative finishing interface comprising the interface formed between the abrasive finishing element finishing surface and the semiconductor wafer surface;
- providing a finishing control subsystem having:
- at least five operative process sensors for sensing in situ process information;
- access to the tracked information;
- and
- a processor to evaluate the in situ process information and the tracked information;
- applying an operative finishing motion in an operative finishing interface forming a coefficient of friction with an organic lubrication in a uniform region of the semiconductor wafer surface;
- and
- evaluating both the in situ process information sensed with the at least five operative process sensors and the tracked information;
- and
- changing a plurality of control parameters at least 10 times to change the coefficient of friction at least 4 times during the finishing cycle time in at least the uniform region having the organic lubrication.
Dependencies are inferred from the claim text.