Method, apparatus, and system for wafer grounding
Systems and methods for wafer grounding and wafer grounding location adjustment are disclosed. A first method may include receiving a first value of an electric characteristic associated with the wafer being grounded by an electric signal; determining a first control parameter using at least the first value; and controlling a characteristic of the electric signal using the first control parameter and the first value. A second method for adjusting a grounding location for a wafer may include terminating an electric connection between the wafer and at least one grounding pin in contact the wafer; adjusting a relative position between the wafer and the grounding pin; and restoring the electric connection between the grounding pin and the wafer. A third method may include causing a grounding pin to penetrate through a coating on the wafer by impact; and establishing an electrical connection between the grounding pin and the wafer.
1. A system comprising:
a grounding pin;
a controller having circuitry for:
controlling the grounding pin to penetrate through a coating on the wafer by impact; and
establishing an electrical connection between the grounding pin and the wafer; and
an actuator coupled to a wafer stage supporting the wafer and configured to actuate the grounding pin,
wherein the controller having circuitry for controlling the grounding pin to penetrate through the coating on the wafer by impact comprises circuitry for actuating the grounding pin toward the wafer, and
wherein the controller having circuitry for actuating the grounding pin toward the wafer comprises circuitry for:
moving the grounding pin away from the wafer for a distance, the distance being based on at least one of a type of the wafer, a type of a coating of the wafer, or thickness of the coating; and
accelerating the grounding pin toward the wafer.
2. The system of claim 1 , wherein after the grounding pin penetrates through the coating on the wafer, the grounding pin is configured to have a direct contact with the wafer or the grounding pin does not fully penetrate the coating.
3. The system of claim 1 , wherein the controller having the circuitry is further for:
controlling the grounding pin to contact the wafer before moving the grounding pin away from the wafer.
4. The system of claim 1 , further comprising:
a mass block, wherein the actuator is configured to actuate the mass block.
5. The system of claim 4 , wherein the controller having circuitry for controlling the grounding pin to penetrate through the coating on the wafer by impact comprises:
circuitry for actuating the mass block to impact the grounding pin toward the wafer.
6. The system of claim 5 , wherein the controller having circuitry for actuating the mass block to impact the grounding pin toward the wafer comprises:
circuitry for actuating the mass block toward the grounding pin.
7. The system of claim 6 , wherein the controller having circuitry for actuating the mass block toward the grounding pin comprises circuitry for:
moving the mass block away from the grounding pin for a distance; and
accelerating the mass block toward the grounding pin.
8. The system of claim 7 , wherein the controller having the circuitry is further for:
determining the distance based on at least one of a type of the wafer, a type of a coating of the wafer, or thickness of the coating.
9. The system of claim 7 , wherein the controller having the circuitry is further for:
controlling the mass block to contact the grounding pin before moving the mass block away from the grounding pin.
10. A non-transitory computer-readable medium that stores a set of instructions that is executable by at least one processor of an apparatus to cause the apparatus to perform a method, the method comprising:
moving a grounding pin away from a wafer for a distance based on at least one of a type of the wafer, a type of a coating of the wafer, or thickness of the coating;
causing the grounding pin to penetrate through the coating on the wafer by impact; and
establishing an electrical connection between the grounding pin and the wafer.