EP2347433A1 - Verfahren zur mechanischen charakterisierung von produktionsmaschinen für sprödbrechende materialien - Google Patents
Verfahren zur mechanischen charakterisierung von produktionsmaschinen für sprödbrechende materialienInfo
- Publication number
- EP2347433A1 EP2347433A1 EP09748024A EP09748024A EP2347433A1 EP 2347433 A1 EP2347433 A1 EP 2347433A1 EP 09748024 A EP09748024 A EP 09748024A EP 09748024 A EP09748024 A EP 09748024A EP 2347433 A1 EP2347433 A1 EP 2347433A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mechanical
- damage
- stress
- brittle
- breaking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/62—Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0428—Apparatus for mechanical treatment or grinding or cutting
Definitions
- the invention relates to a method for the mechanical characterization of production machines for refractile materials, in which a mechanical characterization of such production facilities is made possible by mechanical strength measurements of structurally pre-damaged reference bodies and a determination of the stresses in the area of the damage.
- the greatest damage that can be caused by the breakage of a partially processed wafer in a solar cell production is the stoppage of plants when they are blocked or damaged by wafer fragments.
- a major problem is the mechanical specification of the devices, which must not exceed a given breakage rate for a given wafer thickness and their objective verification. This specification is poorly defined and can not really be tested during commissioning, as the result depends heavily on the mechanical properties of the wafers used. Here a standardization of the mechanical test specification is necessary so that the measured fracture of the machine or wafer pre-damage can be assigned.
- a method for the mechanical characterization of production machines for brittle-breaking materials is provided. This is based on the fact that in a first step a) several reference bodies are produced from the refractile material, the strength distribution of the reference bodies being either known or ascertainable.
- step b) in a part of the reference body targeted structural damage, e.g. Cracks introduced to specifically affect the distribution of strength, i. the mechanical strength of the reference body is reduced to a desired value.
- structural damage e.g. Cracks introduced to specifically affect the distribution of strength, i. the mechanical strength of the reference body is reduced to a desired value.
- step c) the reference bodies are then processed in the production machine.
- the reference bodies are subjected to a mechanical test in which the reference bodies are loaded with the introduced damage with a tensile stress.
- an evaluation of the maximum occurring stress in the area of the damage by means of statistical strength distribution then takes place. It is a statistical evaluation of the calculated breaking stresses, e.g. using the Weibull distribution function, which describes the failure of brittle materials.
- the location of the failure can be determined by means of a pho- tograph.
- F represents the force
- L describes the distance between the outer bearings
- 1 represents the distance between the inner bearings
- h denotes the wafer thickness or the height of the workpiece
- b describes the wafer width.
- substantially equidistant damage to introduce damages into the reference bodies. These can be generated for example by laser, falling tips or hardness impressions.
- the characteristic breaking stresses are preferably set in the range of 20 MPa to 150 MPa.
- the breakage tests may preferably be determined by means of a 3 or 4 bar test, wherein the damage must be subjected to tensile loading or carried out by means of a ball-on-ring test.
- the test object In a ball-on-ring test, the test object is positioned on an annular support. A ball is placed on the specimen so that its center lies on the symmetry axis of the support ring. Now, the ball is moved vertically along this axis of symmetry to deform the specimen and eventually to break. In this case, as in the 4-bar process, the impressed force is absorbed as a function of the travel path. With the ball-on-ring method, especially stresses are generated in the area of the impressing ball and thus less stress on the edges than in the 4-bar break test.
- brittle-refractory material is preferably a material selected from the group consisting of
- semiconductor devices in particular semiconductor wafers, such as silicon wafers, solar cells or ceramic materials used.
- Fig. 1 Schematic representation of the 4-bar test.
- FIG. 3 Graphical representation of the double logarithmic plot using the measured probability of failure S and the voltage values ⁇ .
- Fig. 1 the structure for the 4-beam test is shown schematically. 1 denotes the test piece or workpiece which is subjected to the test.
- Fig. 2 shows a graph for determining the parameters m and b.
- the calculated y-value from In [In (1/1-S)] is plotted against In ⁇ .
- FIG. 3 shows the double logarithmic plot using the measured failure probability S and the voltage values ⁇ .
- FIG. 4 shows the corresponding Weibull statistic.
- the error probability is plotted as a function of the voltage. Starting at a voltage of 140 MPa, the error probability increases exponentially and from a value of 230 MPa asymptotically approaches the limit 1.
- Example 1 Introduction of damages with defined crack length (no distribution of crack lengths).
- Wafer thickness h 0.196 mm
- Wafer width b 125 mm
- Test type 4-beam bending test
- the failure probability S is calculated from the stress values ⁇ using the formula:
- the Weibull statistics determined in the break test can be used to calculate the voltage that has occurred. This voltage value is then used to specify the maximum voltages occurring in the device.
- FIG. 4 graphically illustrates the corresponding Weibull statistic.
Landscapes
- Analytical Chemistry (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Biochemistry (AREA)
- Testing Or Measuring Of Semiconductors Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008051037A DE102008051037A1 (de) | 2008-10-09 | 2008-10-09 | Verfahren zur mechanischen Charakterisierung von Produktionsmaschinen für sprödbrechende Materialien |
| PCT/EP2009/007235 WO2010040530A1 (de) | 2008-10-09 | 2009-10-08 | Verfahren zur mechanischen charakterisierung von produktionsmaschinen für sprödbrechende materialien |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2347433A1 true EP2347433A1 (de) | 2011-07-27 |
Family
ID=41572563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09748024A Withdrawn EP2347433A1 (de) | 2008-10-09 | 2009-10-08 | Verfahren zur mechanischen charakterisierung von produktionsmaschinen für sprödbrechende materialien |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2347433A1 (de) |
| CN (1) | CN102165557A (de) |
| DE (1) | DE102008051037A1 (de) |
| WO (1) | WO2010040530A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD271951A1 (de) * | 1988-05-09 | 1989-09-20 | Adw Ddr Inst Mechanik | Verfahren zur naehrungsweisen bestimmung des weibullmoduls von kompositen |
| DE8904344U1 (de) * | 1989-04-07 | 1989-07-20 | Bornhauser, Adolf-Christian, Dr.rer.nat., 1000 Berlin | Vierpunkt-Biegeprüfapparatur |
| DE4139166A1 (de) * | 1991-11-28 | 1993-06-03 | Hoechst Ceram Tec Ag | Verfahren zur bestimmung der temperaturwechselbestaendigkeit von keramischen substraten |
| JP3157974B2 (ja) * | 1993-12-27 | 2001-04-23 | 京セラ株式会社 | 急冷熱衝撃臨界温度差の推定方法 |
| US5594178A (en) * | 1994-11-08 | 1997-01-14 | Asahi Glass Company Ltd. | Strength evaluation method for brittle material pieces |
| AT411714B (de) * | 2002-05-14 | 2004-04-26 | Werkstoff Kompetenzzentrum Leo | Verfahren und einrichtung zur bestimmung der bruchfestigkeit von spröden werkstoffen |
-
2008
- 2008-10-09 DE DE102008051037A patent/DE102008051037A1/de not_active Ceased
-
2009
- 2009-10-08 EP EP09748024A patent/EP2347433A1/de not_active Withdrawn
- 2009-10-08 CN CN2009801385140A patent/CN102165557A/zh active Pending
- 2009-10-08 WO PCT/EP2009/007235 patent/WO2010040530A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010040530A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010040530A1 (de) | 2010-04-15 |
| DE102008051037A1 (de) | 2010-04-15 |
| CN102165557A (zh) | 2011-08-24 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
Effective date: 20110504 |
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| AK | Designated contracting states |
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| AX | Request for extension of the european patent |
Extension state: AL BA RS |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHOENFELDER, STEPHAN Inventor name: BAGDAHN, JOERG Inventor name: KRAY, DANIEL |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PERES, TERESA ORELLANA Inventor name: SCHOENFELDER, STEPHAN Inventor name: BAGDAHN, JOERG Inventor name: KRAY, DANIEL |
|
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20120503 |