GB/T 25074-2025 in English
VALIDSolar-grade polycrystalline silicon
- Issued on:2025-06-30
- Implemented on:2026-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
| Standard No: | GB/T 25074-2025 |
| Document status: | VALID |
| Title in English: | Solar-grade polycrystalline silicon |
| Title in Chinese: | 太阳能级硅多晶 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2025-06-30 |
| Implemented on: | 2026-01-01 |
| Superseding: |
GB/T 25074-2017 Solar-grade polycrystalline silicon
|
| ICS Classification: | 29.045-Semiconducting materials |
| Chinese Classification: | H82-Elemental semiconductor material |
| Professional Classification: | GB-National Standard |
| Related Keywords: | solar-grade polycrystalline silicon introduction core changes
production process verification process metal impurities detection special grade process adjustment optimize hydrogenation process grade |
| Related Topics: | How about single crystal and polycrystalline
solar grade Solar wafer factory Silicon carbide monocrystalline energy efficiency rating |
《GB/T 25074-2025太阳能级硅多晶》由TC203（全国半导体设备和材料标准化技术委员会）归口，TC203SC2（全国半导体设备和材料标准化技术委员会材料分会）执行，主管部门为国家标准委。
Introduction
Core Changes in the Standard Revision
| Revisions | Requirements for the 2017 Edition | Changes for the 2025 Edition | Impact Analysis |
|---|---|---|---|
| Impurity Control | Oxygen Concentration/Minority Carrier Lifetime Requirements | Delete these two indicators | Simplify the Production Process Verification Process |
| Metal Impurities | Detection of 6 Elements Including Fe | Expanded to 12 Elements (Added Al/K, etc.) | Improve the Anti-PID Performance of Cells |
| Test Methods | GB/T 4060 Sample Preparation | Three new standards, including GB/T 35306 | Improving the comparability of test results |
Analysis of Key Technical Indicators
The new standard divides silicon polycrystalline into four grades: special grade to grade 3, including:
- Donor impurities (P/As/Sb): Special grade requires ≤1.5×1013cm-3, 20% tighter than the 2017 version
- Carbon content: The limit for each grade is uniformly relaxed by 0.5×1016cm-3 to adapt to the modified Siemens process
- Base metal: New ultra-high purity requirement of 8M grade (≤8ng/g)
Test method upgrade
Take surface metal testing as an example:
- Arbitration method: Clearly adopt the GB/T 24582 acid leaching-ICP-MS method
- Sampling specification: Requires preparation of zone-melting single crystal specimens in accordance with GB/T 29057
- Equipment requirements: ICP-MS detection limit must reach 0.01ppbw
Implementation recommendations
Recommendations for photovoltaic companies:
| Links | Countermeasures | Time nodes |
|---|---|---|
| Raw material procurement | Add contract clauses for elements such as Al/K/Ti | Before implementation in 2025 |
| Quality control | Upgrade ICP-MS detection channels | Completion in Q4 2024 |
| Process adjustment | Optimize hydrogenation process to reduce carbon content | Continuous Improvement |
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