Shanghai Bets on Diamond and Gallium Oxide Chips

🔑 Enhanced Key Takeaways

•Shanghai's "fourth-generation semiconductor" initiative in Lingang is formalized by the "Action Plan for Building a Future Industrial Cluster of 4th-Generation Semiconductors (2026–2028)", which is China's first local special industrial policy tailored exclusively to this sector.
•The Lingang plan defines two major development tracks: ultra-wide bandgap semiconductors, including gallium oxide, diamond, and aluminum nitride, as well as ultra-narrow bandgap semiconductors, such as indium antimonide and gallium antimonide.
•Gallium oxide is considered a beacon of hope for particularly heat-resistant and cost-effective semiconductors due to its physical properties, enabling higher breakdown voltages and operating temperatures, and can be produced using cost-effective melt growth methods.
•Sinan Semiconductor incubator, located in the Oriental Chip Port in the Lingang Special Area, offers comprehensive services for semiconductor startups, including EDA design, wafer manufacturing, and packaging and testing certification, and has helped shorten chip design cycles by 30% to 50%.
•The commercialization of fourth-generation semiconductors, particularly gallium oxide, is projected to have a long timeline, with widespread application potentially arriving after 2040, despite the first device result being reported in 2012.

🛠️ Technical Deep Dive

Gallium Oxide (Ga2O3):
- An ultra-wide bandgap semiconductor, specifically beta-phase (β-Ga2O3), with a bandgap of 4.7-4.9 eV.
- Exhibits a theoretical breakdown electric field of 8 MV/cm, which is significantly higher than silicon carbide (SiC) and gallium nitride (GaN).
- Possesses a Baliga's Figure of Merit (BFOM) of approximately 3,300, making it fundamentally superior for high-voltage power switching applications compared to SiC and GaN.
- Can be produced using cost-effective melt growth methods like FZ (Floating Zone) and EFG (Edge-defined Film-fed Growth), which allows for larger diameter wafers with fewer crystal faults, unlike SiC or GaN.
- Its thermal conductivity is relatively low, around 0.27 W/cm·K, posing a critical constraint for high-power operation.
- Common device categories include Schottky barrier diodes (SBDs) and field-effect transistors (FETs) in lateral, vertical, and nanomembrane configurations.
- Key challenges include thermal management and achieving effective p-type doping.
- Research indicates that direct integration of CVD-grown diamond layers with Ga2O3 can reduce thermal resistance by up to 60%.
Diamond (C):
- Known as the ultimate semiconductor material due to its ultra-wide bandgap of 5.47 eV.
- Features high carrier mobility (electron mobility 4000 cm²/V·s, hole mobility 3800 cm²/V·s) and a high critical breakdown electric field of 20 MV/cm.
- Boasts the highest thermal conductivity among semiconductor materials (22 W/cm·K), far superior to SiC and GaN.
- Offers exceptional electrical insulation properties, chemical inertness, stability across extreme temperature ranges, and remarkable mechanical strength.
- Ideal for power devices and applications in harsh environments, such as quantum computing systems, radiation sensors, and communications satellites.
- Challenges include high production costs, limitations in wafer size (currently smaller than 1 inch, though progress towards 4-inch is ongoing), difficulties with deep doping leading to high electrical resistance at room temperature, and complex integration processes.
- The lack of reliable n-type doping limits the development of bipolar devices, with most research focusing on p-type Schottky barrier diodes (SBDs) and unipolar field-effect transistors (FETs).

🔮 Future ImplicationsAI analysis grounded in cited sources

Shanghai will emerge as a global leader in fourth-generation semiconductor manufacturing.

The city's systematic policy, significant investment, and establishment of a full-chain cultivation system in Lingang position it to attract talent and accelerate commercialization in this nascent field.

Diamond and gallium oxide chips will enable a new generation of high-power, high-efficiency electronics.

Their superior bandgap, breakdown field strength, and thermal properties (especially diamond) will allow devices to operate at higher voltages, temperatures, and frequencies with reduced energy loss, transforming applications like electric vehicles and renewable energy.

The widespread commercialization of fourth-generation semiconductors will be a long-term endeavor, extending beyond 2040.

Historical timelines for semiconductor generations (e.g., over 30 years for third-generation to reach scaled deployment) and the current early stage of gallium oxide device development (first device reported in 2012, applications projected after 2040) suggest a prolonged period for widespread adoption.

⏳ Timeline

1988

Shanghai Belling Microelectronics Manufacturing Co., Ltd. builds China's first 4-inch chip production line.

2000

Semiconductor Manufacturing International Corporation (SMIC) is founded in Shanghai.

2012

The world's first gallium oxide device result is reported.

2024-03

Shanghai begins a systematic layout for fourth-generation semiconductors.

2025-03

GAREN Semiconductor fabricates the world's first 8-inch Gallium Oxide single crystal.

2026-08-06

Lingang New Area releases the 'Action Plan for Building a Future Industrial Cluster of 4th-Generation Semiconductors (2026–2028)'.

Shanghai Bets on Diamond and Gallium Oxide Chips

⚡ 30-Second TL;DR

Key Points

🧠 Deep Insight

🔑 Enhanced Key Takeaways

🛠️ Technical Deep Dive

🔮 Future ImplicationsAI analysis grounded in cited sources

⏳ Timeline

📎 Sources (22)

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