SEMI International Standards
Standards New Activity Report Form (SNARF)
Date Prepared: 01/22/2015Revised (if Applicable):

Document Number: 5843
SNARF for: Revision of SEMI PV22-0716, Specification for Silicon Wafers for Use in Photovoltaic Solar Cells

Originating Global Technical Committee: Photovoltaic (PV) - Materials
Originating TC Chapter: China
Task Force (TF) in which work is to be carried out: PV Silicon Wafer Task Force
Note: If a new task force is needed, also submit a task force organization form (TFOF)

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1. Rationale:
a. Describe the need or problem addressed by this activity.
(Indicate the customer, what benefits they will receive, and if possible, quantify the impact on the return on investment [ROI] if the Document is implemented.)
Currently, the standard of the solar wafer is not unified among the manufacturers, it would be difficult to choose and compare for the downstream cell customers. It would also be disadvantageous to the long-term healthy development of photovoltaic industry. Through the multiple test verifications and cost estimates by silicon and solar cell manufacturers, the size standards for two kinds of high cost performance quasi square wafer are determined and described in the following sections. Compared with regular 8-inch products, the major diameter for 8.2-inch silicon wafer is increased from 200 mm to 205 mm, and edge distance is increased by 0.75 mm to 156.75 mm. 97.33 mm2 is increased for area of each small angle, with a total area increased by 1.63%. Taking the 19.5% cell conversion efficiency for example, the average cell power would increase 0.08 W and average power of components 4.74 W. 8.2-inch silicon wafer as shown in Figure a is also known as M1 in the industry.
As for 8.4-inch silicon wafer, the major diameter is increased from regular 8-inch 200 mm to 210 mm, and edge length is increased by 0.75 mm to 156.75 mm, 134.13 mm2 is increased for each area of small angle, with a total area increased by 2.25%. Taking the 19.5% cell conversion efficiency for example, the average cell power would increase 0.1W and average power of components 4.76 W. As with M1, 8.4-inch product illustrated in Figure b is called M2 in the industry.
The thickness of silicon wafer is varying from 70 m to 220 m and distinguished by the interval of 10um.



b. Estimate effect on industry.
2: Major effect on an industry sector - identify the relevant sector
Sector or Company Information:

c. Estimate technical difficulty of the activity.
II: Some Difficulty - Disagreements on known requirements exist but developing consensus is possible

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2. Scope:
a: Describe the technical areas to be covered or addressed by this Document development activity. For Subordinate Standards, list common concepts or criteria that the Subordinate Standard inherits from the Primary Standard, as well as differences from the Primary Standard:
This Specification narrates the size characteristics, crystal defect and electrical properties of silicon wafer used for photovoltaic applications.

b: Expected result of activity
Major revision to an existing Standard or Safety Guideline

For a new Subordinate Standard, identify the Primary Standard here:


Modification of an existing part of Standard(s) or Safety Guideline(s) including Appendices, Complementary Files, and Supplementary Materials

For Standards, identify the Standard Subtype below:
Specification

Miscellaneous (describe below):

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3. Projected Timetable for Completion:

a: General Milestones
a. Activity Start: 01/22/2015b. 1st Draft by: 06/01/2015
c. (Optional) Informational Ballot by: d. Letter Ballot by: 12/01/2015
e. TC Chapter Approval By:06/01/2015

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4. Liaisons with other Global Technical Committees/TC Chapters/Subcommittees/TFs:
a.
List SEMI global technical committees, TC Chapters, subcommittees, or task forces in your or other Regions/Locales that should be kept informed regarding the progress of this activity. (Refer to SEMI Standards organization charts and global technical committee charters and scopes as needed.)
Photovoltaic Materials Committee, Silicon Wafer Committee

b. List any planned Type I Liaisons with external nonprofit organizations (e.g., SDO) that should receive Draft Documents from Standards staff for feedback during this activity and be notified when the Letter Ballot is issued (refer to Procedure Manual § 7):


c. Intercommittee Ballots:
will be issued – identify the recipient global technical committee(s):

Identify the recipient global technical committee(s):

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5. Safety Considerations:
The resulting document is expected:
NOT to be a Safety Guideline

NOTE FOR "to be a Safety Guideline": When all safety-related information is removed from the Document, the Document is NOT technically sound and complete - Refer to Section 15.1 of the Regulations for special procedures to be followed.

NOTE FOR "NOT to be a Safety Guideline": When all safety-related information is removed from the Document, the Document is still technically sound and complete.

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6. Intellectual Property Considerations:
a. For a new Standard or Safety Guideline and for any part to be modified or added in a Revision of published Standards and Safety Guidelines:
the use of patented technology is NOT required.

If "patented technology is intended to be included in the proposed Standard(s) or Safety Guideline(s) " is selected above, then also check one:


b. For Revision, Reapproval, Reinstatement, or Withdrawal of existing Standard(s) and Safety Guideline(s):
there is no known material patented technology necessary to use or implement the Standard(s) and Safety Guideline(s)

c. The body of the Document and any Appendices, Complementary Files, Related Information sections, or Various Materials that may or may not be a part of the Document by reference:
will NOT include reproduced copyrighted material



NOTE FORthe use of patented technology or the incorporation of Copyrighted Item(s) is NOT required’: If in the course of developing the Document, it is determined that the use of patented technology or Copyrighted Item(s) is necessary for the Document, the provisions of Regulations § 16 must be followed.

NOTE FORwill incorporate Copyrighted Item’: A copyright release letter must be obtained from the copyright owner prior to publication.

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7. Comments, Special Circumstances:
None.

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8. TC Member Review:
took place between (put dates below ) before approval at the TC Chapter Meeting, or

Member Review Start Date; 02/02/2015
Member Review End Date: 02/15/2015

NOTE FOR ‘TC Member Review’ is required by the Regulations for a period of at least two weeks
before approval of a new, or a major revision of an existing, Standard or Safety Guideline. (Refer to Regulations ¶ 8.2.1)
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9. SNARF Approval Dates:
TC Chapter or GCS03/17/2015
Recorded in TC Minutes03/17/2015

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10. SNARF Extension Dates:
TC Chapter Extension Granted on
Extension Expires on
Revision of SEMI PV22-1011, Specification for Silicon Wafers for Use in Photovoltaic Solar Cells.docx