Silicon Wafer Industry Enters New Growth Cycle with Accelerated Domestic 12-Inch Substitution

The silicon wafer industry's recovery is now supported by data, but this upturn cycle's core driver is not simple price increases. It represents a structural upswing propelled by AI, HBM, advanced logic, power management, and domestic wafer fab expansions. SEMI's mid-2025 analysis highlighted that AI applications are boosting demand for advanced epitaxial wafers for logic and polished wafers for HBM. By Q1 2026, AI data center-related silicon wafer demand remains robust and is extending to power management devices. AI-related advanced process semiconductor wafer demand alone is projected to reach 1 million wafers per month in 2026, accounting for over 10% of global 12-inch wafer demand. As NAND Flash stacking approaches 400 layers, the widespread adoption of two-wafer bonding technology directly doubles silicon wafer requirements per chip. The smart and electric vehicle revolution is driving explosive demand for automotive-grade MCUs, power devices, and analog chips, with manufacturing for these products rapidly transitioning to 12-inch platforms. SEMI data indicates global 12-inch wafer capacity will hit a record 11.1 million wafers per month by 2028, with over 40% of new capacity coming from mature process lines for automotive and industrial chips.

Contrasting with demand expansion is overseas giants' strategic retreat from mature processes. In March 2026, SUMCO unexpectedly postponed construction of two new wafer fabs, even forfeiting over ¥50 billion in Japanese government subsidies. Management explicitly stated they would concentrate resources entirely on products for 2nm and below advanced processes, abandoning mature process capacity expansion. Similarly, Shin-Etsu Chemical and GlobalWafers have focused recent expansion entirely on advanced processes, with mature process capacity not only stagnant but gradually optimized downward. This strategic shift has created a highly certain market space for domestic 12-inch silicon wafer manufacturers.

The supply-demand reversal is already reflected in pricing. CITIC Securities research confirms the silicon wafer industry's volume growth thesis was fully validated in 2025, with price increases expected to commence in Q2 2026. This places higher demands on domestic wafer producers: AI servers require not just GPUs, HBM, and high-speed interconnects but also substantial power management, analog, memory, sensor, and interface chips. While front-end advanced logic and memory drive high-end 12-inch wafer demand, back-end power management and power devices spur need for heavily doped, epitaxial, low-defect, high-reliability materials. Future growth for wafer companies will increasingly depend on product mix—producing only standard lightly doped polished wafers risks price competition. Companies venturing into epitaxial wafers, SOI, heavily doped power wafers, low-oxygen high-resistivity wafers, and CIS segments can enhance per-wafer value. Domestic 300mm semiconductor wafers still face structural gaps in high-end wafers and specialized products like heavily doped epitaxial wafers, low-oxygen high-resistivity wafers, argon-annealed wafers, high-pixel CIS, and SOI—representing the next phase of import substitution value.

Domestic breakthroughs have substantially overcome long-standing barriers. Twelve-inch wafers long represented a critical weakness in China's semiconductor chain, with the global market dominated by five overseas players including Shin-Etsu Chemical and SUMCO, maintaining a 76% CR5 as of 2025. However, the 2025-2026 industry cycle brought fundamental change. Domestic 12-inch wafer substitution has entered full industrial chain scaling, supported by domestic manufacturers' substantive breakthroughs in technology, customer acceptance, and production capacity barriers. As China's 12-inch wafer leader, National Silicon Industry Group Co.,Ltd. achieved 300mm wafer sales of 6.4163 million units in 2025, up 27.01% year-on-year, with revenue of ¥2.439 billion. The company has achieved mass production of 11N purity wafers, reduced defect density to 0.12-0.15/cm², and maintained yields above 98%. Having passed SMIC's 28nm full-process qualification and completed R&D verification for 14nm logic wafer applications, it now participates in advanced process supply chains, with 28nm production line orders locked through 2028.

TCL Zhonghuan also achieved remarkable progress, with its 12-inch lightly doped wafers certified by leading international clients like TSMC and Infineon. Current monthly capacity reaches 700,000 wafers, planned to expand to 1 million by 2026, already accounting for over 30% of procurement at domestic power device manufacturers. Shanghai Hejing's 12-inch epitaxial wafer sales surged 83.03% year-on-year in 2025, supplying companies like ON Semiconductor and Huahong. Its Zhengzhou production line will commence operations in June 2026. Lion Microelectronics' breakthrough is particularly milestone: its 12-inch automotive-grade wafers passed AEC-Q100 certification, making it China's first mass supplier of automotive-grade 12-inch wafers to automakers including BYD and NIO. The 2-3 year automotive qualification cycle ensures long-term stable cooperation upon supply chain entry, opening high-margin, stable-demand opportunities for domestic manufacturers.

Accelerated import substitution is underpinned by strong demand from domestic wafer fabrication capacity expansion. SEMI forecasts China's 12-inch wafer capacity will reach 3.21 million wafers monthly by 2026, representing one-third of global capacity. Domestic fabs including SMIC, Huahong, and CXMT will contribute approximately 2.5 million wafers monthly, corresponding to annual silicon wafer demand exceeding 30 million units. Reuters reported in February 2026 that SMIC added 50,000 wafers monthly 12-inch capacity in 2025, planning another 40,000 monthly by end-2026. With Q4 2025 capacity utilization at 95.7%, domestic wafer manufacturing remains in expansion, driving rising demand for stable material supply.

Leading domestic wafer suppliers now fully participate in mainstream domestic fab supply chains with increasing procurement shares. The Yangtze River Delta, Beijing-Tianjin-Hebei, and Central-Western semiconductor clusters have formed localized wafer manufacturing-silicon supply closed loops. After years of development, China's 12-inch wafer industry has entered concentrated capacity release phase, with leading players' scaling capabilities continuously improving. TCL Zhonghuan's semiconductor materials business shipped over 1,200 MSI in 2025, generating ¥5.707 billion revenue, up 21.75% year-on-year, maintaining industry leadership in both revenue and volume. National Silicon Industry Group Co.,Ltd.'s 300mm wafers now cover all major applications including logic, memory, and power devices. Xi'an Eswin achieved ¥2.649 billion revenue in 2025, up 24.88% year-on-year, with its second fab reaching 200,000 wafers monthly capacity. However, structural challenges remain: competition intensifies for mid-low end products, while high-end wafers and SOI still face supply gaps. Most companies continue facing depreciation, R&D, and pricing pressures during scaling—necessary growing pains for crossing volume thresholds.

Domestic fabs' continued expansion in mature processes and specialty technologies provides concentrated qualification and adoption windows for local wafers. Extreme supply chain security requirements in automotive electronics and industrial control allow domestic suppliers to leverage advantages in compliance, cost, delivery, and service.

SEMI projects global 12-inch silicon wafer market size will exceed $20 billion by 2030, with China representing over 40% share. For domestic wafer manufacturers, the next 3-5 years will be decisive for industry structure. Prime wafer ratio, high-end epitaxial wafer proportion, key client coverage, capacity utilization, and cash flow quality will determine import substitution trajectory.