Understanding the Entire Semiconductor Process — Explained Simply for Liberal Arts Students

 

All content is based on ChatGPT, so there may be some inaccuracies.
This post explains the entire semiconductor process in simple terms — so even liberal arts students can understand where they might work, or what kind of company they’ve joined.

 

A semiconductor is a tiny chip that acts as the brain of electronic devices such as smartphones, computers, and cars.

To make this small chip, hundreds of precise processing steps are required.

 

🧭 The Entire Semiconductor Process

Design (Fabless) → Photomask → Wafer (Silicon Substrate) → Front-End Process → Wafer Test → Back-End Process → Final Package Test → Reliability/Inspection → Shipment

Let’s take a closer look at each stage.

 

1️⃣ Design (Fabless)

“Fabless” refers to companies that do not own a manufacturing plant (foundry) but instead specialize only in chip design.

Once they complete the final design file, it’s handed over to a foundry (e.g. Samsung Electronics, TSMC) for actual chip production.

Major Fabless Companies: NVIDIA, Qualcomm, AMD, MediaTek, Apple

 

2️⃣ Photomask

Based on the design data, a photomask is created — it acts like a stamp or blueprint that transfers the circuit patterns onto the wafer using light.

Photomask production is extremely high-tech and only a few companies can do it.

Major Photomask Makers: Toppan, DNP, Photronics, Hoya, Taiwan Mask

👉 The thinner and finer the pattern lines, the more circuits can be placed on a chip — meaning better performance and density.

 

3️⃣ Wafer (Silicon Substrate)

A wafer is a thin circular silicon plate, and its raw material is sand — specifically high-purity quartz sand.

• Polysilicon: made by purifying sand (silicon dioxide)
• Wafer: made by melting and slicing the purified polysilicon into thin discs

Major Companies

• Polysilicon: Wacker, Daqo, GCL, OCI
• Wafer: Shin-Etsu, SUMCO, GlobalWafers, Siltronic, SK Siltron

4️⃣ Front-End Process — Making Circuits on the Wafer

The front-end process is where the actual transistor and circuit patterns are built onto the wafer, through dozens or even hundreds of repeated steps.

Key Processes:

• Oxidation / Epitaxy: Grow an insulating or silicon layer on the wafer surface
• Photolithography: Use light and the photomask to print circuit patterns
• Etching: Chemically or by plasma remove unwanted parts
• Deposition: Stack metal and insulating layers
• Ion Implantation: Adjust electrical properties of the chip
• CMP (Chemical Mechanical Polishing): Flatten the surface

Major Equipment Companies:

• Lithography: ASML
• Etching: Lam Research, Applied Materials
• Deposition: Applied Materials, Tokyo Electron

 

5️⃣ Wafer Testing (Wafer Probing)

After the front-end process, each chip (die) on the wafer is electrically tested before packaging.
This step uses high-speed automatic test equipment (ATE) and probe cards to ensure only good chips move to the next stage.

Major ATE Companies: Advantest (Japan), Teradyne (USA)

 

6️⃣ Back-End Process (Packaging / Assembly)

This is where chips are cut, assembled, and molded into the final physical semiconductor shape.
Steps include:

• Dicing: cutting the wafer into individual chips
• Bonding: connecting wires or flip-chip bonds
• Molding: sealing the chip in resin
• Package Inspection

Major OSAT (Outsourced Semiconductor Assembly and Test) Companies:
ASE, Amkor, JCET, Hana Micron, SFA

 

7️⃣ Final Test & Shipment

• Final Test: packaged chips are tested again for power, performance, and communication
• Burn-in: stress testing under high temperature/voltage to filter out early failures
• Binning: classifying chips by performance level
• Qualified chips are then labeled, packaged, and shipped.

Major Test Equipment Suppliers: Advantest, Teradyne

 

 

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🏭 Fabless vs. Foundry vs. IDM

• Fabless: Companies that only design chips
• Foundry: Companies that perform the actual manufacturing process
  → Examples: TSMC (world’s #1), Samsung Electronics, UMC
• IDM (Integrated Device Manufacturer): Companies that do everything — design, manufacturing, and packaging
  → Examples: Samsung Electronics, Intel