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Ultra-Thin Diamond Wire for Silicon Wafer Slicing

Advanced diamond wire technology for monocrystalline silicon wafers. Achieves 120μm thickness with ≤3μm TTV, 40% less material waste, and 400km cutting lifespan. SEMI S23/S28 compliant.

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Spare Parts

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team3@huataogroup.com

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Product Details

Ultra-Thin Diamond Wire for Silicon Wafer Slicing

Nanoscale Precision Engineering

Optimized for N/P-type monocrystalline silicon (Mohs 7.0), this wire integrates electrolytic diamonds (1.5–3μm) via pulsed-plasma CVD bonding. With 0.07–0.10mm diameter and laser-calibrated bead alignment, it reduces kerf loss to 65–85μm – critical for 210mm TOPCon and HJT solar cells.

Core Performance Advantages

Zero Material Waste
- Kerf: 65μm (vs. 160μm in slurry saws)
- Saves 22g silicon/wafer ($0.48/wafer at 2024 Si prices)
Subsurface Integrity
- Micro-crack depth: <0.15μm (μ-Raman validated)
- TTV control: ≤3μm for 210mm wafers (SEMI MF1811)
Production Scalability
- Line speed: 25 m/s (4× slurry processing)
- 450km lifespan per wire (SEMI PV22-0817 standard)

Technical Specifications

Parameter	Specification
Wire Diameter	0.07mm (PV) / 0.10mm (Semicon)
Diamond Grit	1.5–3μm monocrystalline (ISO 6106 Grade D)
Bead Density	230–260 beads/meter (±3 bead tolerance)
Tension Control	Real-time μ-strain feedback (±0.003%)
Cutting Fluid	Deionized water (≤1ppb metals, 18°C±0.5)
Surface Roughness	Ra ≤0.2μm (AFM measured)
Certification	SEMI S23/S28, VDE 0126-5, ISO 14644-1 Class 3

210mm TOPCon Solar Cell Production Case

Facility: Tier-1 PV Plant, Fujian, China (5GW capacity)
Challenge:

Slurry saws: 11% breakage rate at 150μm thickness
$3.2M/year silicon waste

Solution:

0.07mm diamond wire (2.5μm grit, 245 beads/m)
Applied Materials PWS 292 slicing system

Performance Metrics (12-month audit):

Parameter	Slurry Saw	Diamond Wire	Improvement
Wafer Thickness	150μm	120μm	-20%
Breakage Rate	11%	0.25%	98%↓
Cycle Time	38 min/ingot	9 min/ingot	76%↓
TTV	10μm	2.8μm	72%↓
Kerf Loss	160μm	68μm	57%↓
Si Consumption	1.98g/W	1.41g/W	29%↓

*"Electrostatic discharge control eliminated cell micro-fractures, boosting our TOPCon module efficiency to 24.8%."*
— Zhang Wei, CTO

Critical Technical Innovations

Anti-Vibration Beads
- Air-cushioned diamond segments absorb 92% harmonic resonance
- Enable 25 m/s cutting without wafer chatter
Contamination Control
- Ni-P matrix with <0.01ppb metal ion release
- In-line 20MHz ultrasonic cleaning
Smart Tensioning
- Fiber Bragg grating sensors detect 0.0001% strain variation
- Auto-calibrates every 200m of cutting

Material-Specific Parameters

Application	Configuration	Performance Target
210mm TOPCon	Ø0.07mm/245 beads/m	TTV≤2.8μm, 0.2% breakage
200mm Si Semicon	Ø0.10mm/210 beads/m	Ra≤0.15μm, ±0.5° cut
SiC Epitaxy	Ø0.12mm/180 beads/m	SSD<0.1μm, 18 m/s

Quality Assurance Protocol

Pre-Production
- Diamond grit: SEM-EDS analysis (SDB® 1080 certification)
- Bead concentricity: ≤0.3μm runout (laser interferometry)
In-Process
- Every 50m: μ-Raman subsurface damage scan
- Real-time particle count: <3/ft³ (ISO Class 3)
Post-Cutting
- Wafer fracture strength: ≥1.2GPa (3-point bend test)
- Minority carrier lifetime: ≥2ms (μ-PCD measurement)