Coating methods and apparatus for coating
View Patent ↗Described are process control methods for spin-coating, and apparatuses and devices incorporating the same, wherein the method is useful for application of developer solution to a substrate, and wherein the process control method includes one or more features of: interrupted serial process control using an interrupt signal from a hardware or a software component, an interrupt service routine, and a multiple process commands initiated at durations measured in parallel from an earlier process event.
1. A method for providing a photoresist coating onto a substrate, the method comprising:
spin-coating a photoresist solution onto the substrate wherein the spin-coating process is controlled by a method comprising:
controlling the process using serial process control sequentially executing a series of subroutines;
interrupting the serial process control with a hardware interrupt signal to execute a process command; and
applying a developer solution onto the spin-coated photoresist using a spin-coating apparatus wherein the spin-coating apparatus is controlled by a method comprising:
controlling the process using serial process control sequentially executing a series of subroutines; and
interrupting the serial process control with a hardware interrupt signal to execute a process command.
2. The method of claim 1 wherein the hardware interrupt signal is a signal from a component of the spin-coating apparatus selected from the group consisting of a sensor, a controller, a pump, a dispenser, a turntable, and a timer.
3. The method of claim 2 wherein the hardware interrupt signal is sent from a supply system controller upon occurrence of a start of solution dispense or an end of solution dispense, or both.
4. A method for controlling a process of applying a developer solution onto a substrate using a spin-coating apparatus, the method comprising:
controlling the process using serial process control wherein the process is controlled by sequentially executing a series of subroutines; and
interrupting the serial process control with an interrupt signal to execute a process command, wherein the interrupt signal relates to a process event chosen from the group consisting of: a beginning of a dispenser movement into dispensing position; an end of a dispenser movement into dispensing position; a beginning of a solution dispense; an end of a solution dispense; a beginning of dispenser movement out of dispensing position; and an end of dispenser movement out of dispensing position.
5. The method of claim 4 wherein serial process control is interrupted using an interrupt signal which causes execution of an interrupt service routine.
6. The method of claim 5 wherein the interrupt service routine starts multiple timers, each timer measures a different duration, and at the end of each duration the interrupt service routine sends an interrupt signal to the process control system which executes a process command.
7. The method of claim 4 wherein the method avoids accumulation of timing variability in processing commands otherwise caused by serial timing methods.
8. A method for controlling a process of applying a developer solution onto a substrate using a spin-coating apparatus, the method comprising:
controlling the process using serial process control wherein the process is controlled by sequentially executing a series of subroutines; and
interrupting the serial process control with an interrupt signal to execute a process command, wherein the process command is chosen from the group consisting of: a start of dispenser movement; a start of dispense of a developer solution; an end of dispense of the developer solution; a change of turntable spin acceleration or deceleration.