12 inch Sapphire Wafer：C-plane SSP / DSP Optoelectronic Devices 12 inch Industrial Grade

Product Overview

    The 12-inch (300mm) sapphire wafer is a high-end large-format specification in the sapphire substrate sector. It is fabricated from 4N5 to 5N grade high-purity synthetic single-crystal alumina (α-Al₂O₃), with single-crystal ingots grown via advanced processes such as the Kyropoulos method, followed by semiconductor-grade procedures including multi-wire slicing, precision lapping and chemical mechanical polishing (CMP). As a large-size foundational substrate for the third-generation semiconductor industry, it is fully compatible with 12-inch standard semiconductor production lines. The effective epitaxial area per wafer is approximately 9 times that of a 4-inch wafer and 2.25 times that of an 8-inch wafer, greatly increasing chip output per batch and significantly reducing substrate cost per chip. This product overcomes technical difficulties such as large-size crystal growth uniformity, global flatness control and warpage resistance under high-temperature processes, and serves as a core supporting material for the mass production of next-generation Mini/Micro LED displays and large-format GaN power devices.

Core Technical Features

1.Ultra-large Format for Mass Production

    The 300mm large diameter achieves a leap in substrate area. It is compatible with 12-inch standard MOCVD epitaxy equipment and semiconductor back-end production lines, more than doubling chip output per batch compared with 8-inch wafers, and greatly amortizing equipment depreciation and process costs. It is the mainstream technical upgrading direction for cost reduction and efficiency improvement in the optoelectronic and power device industries.

2.High-uniformity High-purity Single-crystal Material

    Single crystals are grown from high-purity alumina raw material, with strict control over axial and radial impurity distribution in large-size ingots, ensuring consistent crystal structure and uniform dislocation density across the entire wafer. It solves problems such as component segregation and uneven stress commonly seen in large-size sapphire crystals, and guarantees wafer-wide consistency in epitaxial growth and device performance.

3.High-temperature Thermal Stability for Large Format
    With a melting point of 2050℃, the crystal structure remains stable under the high-temperature epitaxy environment of 1000~1200℃. Through crystal growth stress regulation and processing stress relief processes, it effectively suppresses warpage and deformation of large-size wafers during high-temperature cycling processes, ensuring the uniformity of epitaxial layer growth and device yield.

4.Excellent Electrical Insulation & Dielectric Properties
    Intrinsic high-purity sapphire has a room-temperature resistivity higher than 10¹⁴ Ω·cm, with excellent electrical insulation and ultra-low dielectric loss. It provides reliable electrical isolation between devices, suppresses leakage and signal crosstalk under high-voltage conditions, and meets the performance requirements of high-voltage GaN power devices and high-frequency RF devices.

5.Wafer-wide Ultra-precision Surface Flatness Control

    Both Single Side Polished (SSP) and Double Side Polished (DSP) processes are available. The epitaxial surface achieves atomic-level flatness via CMP, with a polished surface roughness Ra ≤ 0.2nm. Targeting the characteristics of 12-inch large format, global Total Thickness Variation (TTV), bow and warp are specially controlled, with excellent wafer-wide flatness uniformity, fully meeting the requirements of large-format MOCVD epitaxial growth.

6.Superior Chemical & Plasma Resistance
    Sapphire has extremely strong chemical inertness, insoluble in most acids, alkalis and organic solvents at room temperature. It can withstand harsh process environments such as plasma etching, wet cleaning and high-temperature annealing in semiconductor manufacturing, with minimal corrosion damage and particle shedding on the surface, ensuring process cleanliness and long-term device reliability.

7.Multiple Crystal Orientations & Full Parameter Customization

    C-plane (0001) orientation is supplied as standard, while special orientations including A-plane, R-plane and M-plane are also available, with customizable off-angle specifications. Parameters such as wafer thickness, edge chamfer, notch and surface cleanliness can all be customized according to customer requirements, adapting to different device processes and equipment standards.

8.High Mechanical Strength & Standard Process Compatibility

    With a Mohs hardness of 9, it has excellent mechanical rigidity and bending resistance. Edge chamfering and stress relief processes are optimized for large-size wafers, enabling them to withstand various post-processing procedures such as thinning, dicing, PSS patterning and metallization, and adapting to the handling and processing flows of 12-inch standard semiconductor equipment.

Standard Specifications

Typical Applications

1. Display optoelectronic field: Epitaxial growth of large-size Mini/Micro LED display chips, high-end display panel mass production lines
2. Power semiconductor field: 12-inch GaN-based high-voltage power devices, fast-charging chips, large-scale mass production of automotive power electronics
3. Integrated circuit field: Silicon-on-Sapphire (SOS) RF integrated circuits, 12-inch compatible high-frequency microelectronic devices
4. Optical window field: Large-size high-precision optical windows, infrared detection windows, special optical protection components
5. Special electronic field: High-temperature electronic devices, aerospace-grade radiation-resistant electronic components, large-size substrates for MEMS sensors

Quality Control

    A special semiconductor-grade full-process quality control system is established for 12-inch large-size wafers. Wafer-wide multi-dimensional inspection is performed on each batch, and a complete Certificate of Analysis (COA) can be provided. Core inspection items include: wafer-wide dimensional accuracy and thickness uniformity inspection, crystal orientation deviation verification, global flatness and roughness scanning, wafer-wide visual defect mapping inspection, cleanliness and surface stress testing, edge quality and packaging sealing verification, ensuring parameter consistency and process reliability of large-size products.

FAQ

What is the main difference between 12-inch sapphire wafers and smaller 6-inch / 8-inch wafers?

    The 12-inch (300mm) wafer delivers a much larger usable epitaxial area — roughly 2.25 times that of an 8-inch wafer and 9 times that of a 4-inch wafer. It is compatible with 12-inch standard semiconductor production lines and high-capacity MOCVD reactors, significantly boosting chip output per batch and lowering per-unit chip cost. It is designed for large-scale mass production of Mini/Micro LED displays and high-voltage GaN power devices, while 6/8-inch wafers are more widely used for R&D, small-to-medium volume production and conventional LED lines.

Can the thickness of 12-inch sapphire wafers be customized?

    Yes. Standard thickness options include 800μm, 1000μm and 1200μm, and custom thickness specifications can be manufactured according to customer process requirements. TTV, bow and warp are strictly controlled across all thickness options to guarantee wafer-wide flatness and process compatibility.

Do you offer crystal orientations other than C-plane (0001), and can the off-angle be adjusted?

    Yes. Besides the standard C-plane orientation for GaN LED and power device epitaxy, A-plane, R-plane and M-plane orientations are available for SOS RF devices, non-polar GaN devices and specialty optical applications. The precise off-angle can also be customized per customer drawings or epitaxial process requirements to optimize epitaxial film quality and device yield.

Can additional processing such as PSS patterning or metallization be applied to 12-inch wafers?

    Yes. Value-added services including PSS/NPSS patterning, full or localized backside metallization, precision edge chamfering and ultra-thin wafer thinning are available. Feasibility depends on pattern dimensions, coating materials, wafer thickness and required mechanical strength.

How is warpage controlled for 12-inch large-size sapphire wafers under high-temperature processes? 

    Warpage is controlled through the full production chain. We optimize crystal growth stress during ingot growth, release residual stress during lapping and polishing, and apply precision edge chamfering design. Bow and warp values are strictly inspected before delivery to ensure dimensional stability and uniform epitaxial growth under high-temperature MOCVD processes.

Do you support small-batch prototype orders for 12-inch sapphire wafers?

    Yes. Prototype quantities, lab-scale trial batches and maintenance replacement orders are all acceptable. Pricing and lead time will be evaluated based on customized parameters, processing difficulty and required quality grade.

Related products

Al2O3 Sapphire Watch Case Transparent Classical Circle AR-coating

Corrosion Resistant Thermocouple Protection Tubes Transparent Sapphire Glass Pipe