Patent ID: 11961706
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An ion beam etching (IBE) system, comprising:
a plasma chamber configured to provide plasma;
a screen grid comprising a screen grid element in contact with the plasma chamber;
an extraction grid comprising an extraction grid element disposed adjacent to and separated from the screen grid element;
an accelerator grid comprising an accelerator grid element disposed adjacent to and separated from the extraction grid element;
a decelerator grid comprising a decelerator grid element disposed adjacent to and separated from the accelerator grid element;
a hole that extends through the screen grid, the extraction grid, the accelerator grid, and the decelerator grid;
wherein the screen grid is configured to receive a screen grid voltage to extract ions from the plasma within the plasma chamber to form an ion beam through the hole;
wherein the extraction grid is configured to receive an extraction grid voltage;
wherein an ion current density of the ion beam through the hole depends on a voltage difference between the screen grid voltage and the extraction grid voltage;
wherein the accelerator grid is configured to receive an accelerator grid voltage;
wherein an ion beam energy for the ion beam through the hole depends on a voltage difference between the extraction grid voltage and the accelerator grid voltage; and
wherein the decelerator grid is configured to receive a decelerator grid voltage; and
a control unit configured to supply the screen grid voltage to the screen grid and supply the extraction grid voltage to the extraction grid.