FAB Processes

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The FAB process, or semiconductor manufacturing process, is a series of complex processes that process semiconductor materials, such as silicon, into integrated circuit (IC) chips. This highly sophisticated manufacturing process is the cornerstone of the modern electronics industry, enabling us to produce microprocessors and memory chips for mobile phones, computers, automobiles, and various smart devices. FAB, or Fabrication, means manufacturing, and in the semiconductor industry, it specifically refers to the factories used to produce integrated circuits and their manufacturing processes.
The main steps of the FAB process
The FAB process flow covers a series of steps from wafer fabrication to final testing, each of which has a decisive impact on the performance and yield of the chip. Here's a closer look at this complex process:
1. Wafer preparation
The first step in making an integrated circuit is to fabricate a silicon wafer. Polysilicon is purified into monocrystalline silicon by the reduction method, which is then grown into large-diameter monocrystalline silicon columns by a lifting method (e.g., Czochralski (CZ) growth method. The monocrystalline silicon pillar is then cut into thin slices and polished to form a smooth wafer that provides the substrate for the subsequent process.
2. Oxidation
In a clean environment, the surface of the wafer is oxidized to form an insulating silica film, which is the basis for the insulating layer and the subsequent mask process.
3. Lithography
Lithography is a process in which a circuit pattern is transferred to the surface of a wafer. This step involves a series of operations such as photoresist coating, drying, exposure (through masking), development, hardening, etc., to finely control the transfer process of the pattern.
4. Wet and dry etching
Etching is the process of removing material from a selected area to form a circuit pattern. Wet etching uses chemical solutions, while dry etching, such as reactive ion etching, utilizes plasma etching technology, providing greater accuracy and pattern fidelity.
5. Ion implantation
Ion implantation is used to dope wafers by injecting ions from a dopant (such as boron or arsenic) into the wafer at high velocity, changing its electrical properties to form n-type or p-type silicon.
6. Chemical Vapor Deposition (CVD) and Physical Vapor Deposition (PVD)
CVD and PVD technologies are used to deposit insulating, conductive, and metal layers on the wafer surface. These films are used to make up the various parts of a transistor and interconnect.

7. Chemical Mechanical Polishing (CMP)
CMP is a process of flattening the surface of a wafer in order to ensure the accuracy and consistency of the subsequent layer-up construction.
8. Hierarchical process
The process of lithography to CMP is repeated to construct a complex multilayer circuit structure. Each layer needs to be precisely aligned to ensure the correct connection.
9. Fine metal interconnects
Electroplating or CVD technology is used to form tiny metal wires to connect transistors and other components to realize the function of the circuit.
10. Automated Optical Inspection(AOI)
Automated optical inspection equipment is used to check patterns for errors and defects, ensuring that every step of the process is carried out according to the design standards.
11. Encapsulation
The finished wafer is cut into individual chips, wire-bonded, soldered, or other methods to mount the chips into the package and connect to external interfaces.
12. Testing & Sorting
The electrical performance of each packaged chip is tested, and the chips are graded and sorted according to the test results. The FAB process is a high-tech, high-precision, and difficult technical challenge that involves a lot of advanced knowledge of physics, chemistry, and materials science. With the advancement of technology, the FAB process is developing in the direction of smaller process size, higher integration, and lower energy consumption to meet the demand for miniaturized and high-performance electronic products in the high-tech era. The perfection of each step of the process is a witness to the continuous innovation and development of the integrated circuit manufacturing industry, and it is also an important cornerstone of modern industrial civilization.