EP1652228A2 - Vorrichtung zur stabilisierung von dünnen scheiben - Google Patents
Vorrichtung zur stabilisierung von dünnen scheibenInfo
- Publication number
- EP1652228A2 EP1652228A2 EP04766154A EP04766154A EP1652228A2 EP 1652228 A2 EP1652228 A2 EP 1652228A2 EP 04766154 A EP04766154 A EP 04766154A EP 04766154 A EP04766154 A EP 04766154A EP 1652228 A2 EP1652228 A2 EP 1652228A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- support frame
- thin wafer
- thin
- wafer
- profile
- 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.)
- Ceased
Links
Classifications
-
- 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
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
Definitions
- the present invention relates to a device for stabilizing thin slices, in particular to a support frame for thin wafers according to the preamble of claim 1.
- Such thin semiconductor wafers or wafers have a diameter in the order of 2 to 8 inches, for example disk thicknesses which are in the order of a few 10 to a few 100 ⁇ m.
- Such semiconductor wafers have so far mostly been moved manually or with a handling system from a first processing location to a second processing location.
- thin grinding unwantedly produces semiconductor wafers that contain both concave and convex curvatures.
- These semiconductor wafers can no longer be handled without problems by the handling system. Therefore, they are generally removed manually from a corresponding container using special tweezers and placed in a so-called quartz boat for further processing, for example.
- a quartz boot is a specific storage cassette for semiconductor wafers.
- the use of tweezers is not without problems, since this easily leads to partial damage, such as the occurrence of Hairline cracks and thus lead to chip failure in the corresponding area of the semiconductor wafer.
- a so-called pneumatic tweezers for handling thin wafers is known from DE 199 48 572 AI.
- the tweezers shown and described there have a plate designed as a nozzle plate, which has a vacuum bore in its center and which contains numerous nozzle bores on the circumference, which are used to produce a so-called Bernouli pincer, which is also known as the Bernoulli effect is.
- This Bernoulli effect is to be understood to mean the formation of a hydrodynamic negative pressure, which arises from the fact that gas flows from the center of a nozzle plate through outward-directed nozzles into the edge areas of the nozzle plate and a lower air pressure in the center prevails than in the outside areas, in which the gas from
- Thin wafer slices can be handled relatively well with such pneumatic tweezers, the function of which is based on the above-described effect, since the combination of the Bernoulli effect and vacuum as contactless holding elements for wafer slices has decisive advantages.
- the present invention is based on the object of providing a device with the aid of which thin wafers can be handled better and, above all, more safely. This object is achieved by a device with the features of claim 1. Advantageous embodiments of the device can be found in the dependent claims.
- the particular advantages of the device according to the invention lie in the fact that thin wafers which are flexible per se maintain this property through the new device, but are mechanically reinforced and stabilized by the device.
- the edges of the thin wafer are protected from damage.
- the device compensates for voltages in the wafer, so that a planarization effect occurs.
- Both the front and the back of the thin wafer remain free for measurements and other handling steps, electrical measurements also not being influenced by the device.
- the transport of individual thin wafers is both manual and with the help of assembly devices, i.e. Vending machines possible.
- the thin wafer can be stored indefinitely because its active surfaces such as the front and back are not contaminated by adhesives or the like
- a support frame is attached, the cross section of which is formed by a profile, and the outer contour of which at least slightly projects beyond the thin wafer, e.g. in the range from 0.1 millimeter to 1.5 millimeter, in particular in the range from 0.5 millimeter to 1 millimeter.
- the contour of the support frame is matched to the outer contour of the thin wafer. It is also advantageous if the cross section of the profile of the support frame has the shape of a polygon.
- the polygon is designed as a trapezoid and if the trapezoid is designed asymmetrically. It is also particularly advantageous if the trapezoid encloses two right angles and if the corners of the right angles are essentially designed as broken edges. It is also advantageous if one side of the trapezium is inclined towards the center of the wafer and is formed from a material such as a composite material, this composite material being a highly crosslinked resin with a high degree of filling, e.g. Is carbon fiber and low residual stress on ice.
- a device according to the invention can be designed very advantageously if the polygon is designed as a triangle. It is particularly advantageous if the triangle is designed as an equilateral triangle and if one side of the triangle is inclined towards the center of the wafer. It can be beneficial to form the triangle from a material such as quartz glass.
- a support frame can also be particularly advantageous if the profile is designed as a right angle with legs of unequal length.
- the longer leg lies in a plane that runs parallel to the plane of the thin wafer and has adhesive openings for receiving adhesive with which the thin wafer is detachably attached to the curved profile.
- the shorter leg lies in a plane that runs perpendicular to the plane of the thin wafer, and if the outer contour of the shorter leg projects at least slightly beyond the peripheral contour of the thin wafer.
- a support frame is particularly favorable if the edges of the angle profile are broken, wherein the broken edges can be formed by radii or facets.
- a support frame is also advantageous if it is made of metallic or artificial material.
- the support frame can remain on the thin wafer when it is separated, but even if the support frame is detached from it when the thin wafer is separated, it is of great advantage in the process steps described above.
- the support frame can remain on it during process steps, such as checking the thin wafer, writing, heating, intermediate storage, if necessary.
- the active surfaces - like the front and back - of the thin wafer remain free of contamination despite the stiffening by the support frame without any special and / or additional effort.
- FIG. 1 shows a thin wafer with an attached support frame
- Figure 2 is a circular support frame in plan view
- Figure 3 shows a detail of the support frame of Figure 2
- FIG. 4 shows a further detail from FIG. 2
- FIG. 5 shows a plan view of a support frame with a flattened portion (Fiat);
- FIG. 6 shows a detail of a support frame according to FIG. 5;
- FIG. 7 further details of this support frame;
- FIG. 8 shows a plan view of a further thin wafer with a support frame;
- FIG. 9 shows a detail of the thin wafer from FIG. 8;
- FIG. 10 shows a view of a further thin wafer with a support frame;
- FIG. 11 shows a side view of the thin wafer from FIG. 10 and
- FIG. 12 shows a detail of the thin wafer from FIG. 11.
- a thin wafer 1 shown schematically in FIG. 1 has a flattened portion, a so-called Fiat 3, on its circumference 2.
- a Fiat 3 serves to align the thin wafer 1 in the individual process steps. Due to its stop surface - which can be placed on a corresponding counter surface of a device - an exact alignment of the thin wafer 1 is always guaranteed.
- a support frame 4 is arranged on one side - the front side - of the thin wafer 1, which for this reason is intended to carry the technical term "front sidering". It is technically advantageous to arrange the support frame 4 on the front side of the thin wafer 1, ie on the side which forms most of the active components. In an alternative exemplary embodiment, however, the support frame is attached to the rear of the wafer.
- FIG. 2 shows a top view of a circular support frame 42. Details of this support frame 42 are shown in FIGS. 3 and 4.
- Figure 3 shows a detail, which is a section of the Support frame 42, in which an adhesive bore 52 can be seen. Some of these adhesive bores 52 are attached to the circumference of the support frame 42 in order to connect the thin wafer 1 to the support frame 42, if necessary in a detachable manner.
- the support frame 42 has an angular cross section and is attached to the front side 1F of the thin wafer 1 with the aid of an adhesive K, which is in each case in one of these adhesive holes 52, of which in FIG Figure 4 shows an adhesive bore 52 is shown enlarged.
- the adhesive holes 52 are arranged in the long leg 4L of the angular support frame 42 at some points distributed over its circumference.
- the short leg 4K of the support frame 42 forms the outer boundary of the support frame 42 and projects with its outer circumference slightly beyond the outer circumferential edge 2 of the respective thin wafer 1. This forms a shock protection for the sensitive edge 2 of the thin wafer 1.
- the adhesive K is selected according to the requirements and it can be advantageous if it can be released by thermal action. However, it is not necessary to release the front face (support frame) 4, 42 after finishing. Since the front side frame (support frame) 4, 42 can be mass-produced in an extremely inexpensive manner, it is particularly advantageous if it is left on the thin wafer 1 until the end of the manufacturing processes and sawed open when the thin wafers are separated, for example by sawing. With this measure, the cheap Frontsidermg (support frame) 4.42 is “sacrificed”, but the handling of the thin wafer 1 remains optimal until the end of the manufacturing processes. 5 shows a further embodiment of a front side ⁇ is rings (support frame) 45 shown schematically.
- FIG. 6 shows an enlarged detail of the support frame 45 from FIG. The transition from the circular periphery 25 of the support frame 45 to the Fiat 35 is shown.
- An adhesive bore 55 is preferably arranged at this point.
- FIG. 7 shows in its sub-figures 7a and 7b a variant of the support profile of the support frame 45, which is indicated by the specification of the section in FIG. 5.
- the edges of the profile of the support frame 45 are provided with facets
- the edges are rounded.
- FIG. 1 A thin wafer 18 is shown schematically in FIG. 1
- FIG. 9 An enlarged detail of the thin wafer 18 from FIG. 8 is shown in the associated FIG. 9.
- a support frame 49 is attached to the front side 18F of the wafer 18 with the aid of an adhesive K9.
- This variant of the support frame 49 shows the profile of a support frame 49 which is trapezoidal in cross section.
- the cross section of the trapezoidal support frame 49 is asymmetrical and an inner surface 49F of the pro Fils of the support frame 49 forms an annular surface 49F facing the center of the thin wafer 18, which is inclined so that the subsequent method steps, for example the photo-technical steps, can take place without hindrance.
- the photoresist to be applied can be well spun on with uniform homogeneity or an excessive amount can be spun off well.
- the outer peripheral region of the support frame 49 forms the outer region of the trapezoidal profile. This outer area extends slightly beyond the circumference of the thin wafer 18 and protects it against damage.
- the profile of the support frame 49 includes two right angles in this area and the edges of the right angles are broken, so that in each case a radius is created which is less sensitive to impacts than sharp edges.
- the basic shape of the polygon is basically retained because a radius is known to be a polygon with an infinite number of corners.
- the polygon can also be designed as a trapezoid with other aspect ratios without departing from the inventive concept.
- this construction shown in the exemplary embodiment is preferred.
- An implementation can be exemplified with a support frame that protrudes approx. 0.5 to 1mm beyond the wafer edge.
- the support frame could have dimensions of approximately 0.5 mm in thickness and 2 to 4 mm in width and could be applied to the wafer after the last high-temperature step of approximately 900 ° C., and could then remain on the wafer until it was separated.
- the support frame 49 preferably consists of a composite material that is temperature-resistant up to approx. 420 ° C. fibers and low residual stresses.
- Adhesive K9 a material with the trade name "Imid” can be used because its viscosity can be adjusted according to the requirements.
- the skilled person will ensure that the selected composite material is temperature and chemical resistant and the required properties of the thin wafer 18 are not negatively influenced .
- the additional variant shown in FIG. 10 shows a further thin wafer 110 with a support frame 410, which otherwise resembles the exemplary embodiments from FIGS. 1 and 5 because it is also shown with a Fiat 310.
- the diameter is 150 mm with a tolerance of 0 to -0.1 mm and is adapted to the diameter of the thin wafer 110 to be protected.
- the Fiat 310 is arranged so that there is a distance of 69.3 mm from the center of the wafer with a tolerance of +0 and -0.1 mm. Alternatively, positive tolerances are chosen.
- FIG. 11 shows a highly schematic side view of the thin wafer 110 from FIG. 10, and FIG. 12 shows an enlarged detail from this FIG. 11.
- support frame 410 consists of a material such as quartz glass and the polygonal profile cross-section is realized by an uneven triangle.
- the width of the base of the triangle is 3mm and the height of the triangle is 1mm.
- the gluing of the quartz glass 410 is advantageously carried out using a silicon adhesive K10 with a layer thickness of 0.1 mm.
- the width of the adhesive ring is approximately 2.1mm and its distance from the outer edge of the support frame 410 is approx. 0.3mm.
- different profile configurations are chosen.
- the final profile shape will depend on the dimensioning of the support frame 4, 42, 45, 49, 410 and its manufacturing method.
- the support frame described here by means of various exemplary embodiments can be used advantageously not only for thin wafers, but also for other thin slices and in general for fragile objects.
- the invention also relates to a production method in which the following steps are carried out independently of the listing sequence: provision of a substrate for an integrated circuit arrangement, in particular a semiconductor substrate, materially connecting the substrate to a support frame, in particular to the support frame according to the invention or with a support frame according to an embodiment and in particular by gluing,
- the substrate is preferably thinned before the connection or after the connection, in particular by thin grinding or by wet chemical etching.
- the method is particularly effective for thinned substrates, but is also used for undiluted substrates or wafers, in particular for wafers with a diameter of 300 millimeters or more than 300 millimeters.
Landscapes
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Packaging Frangible Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10336478 | 2003-08-08 | ||
| PCT/EP2004/051399 WO2005015611A2 (de) | 2003-08-08 | 2004-07-07 | Vorrichtung zur stabilisierung von dünnen scheiben |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1652228A2 true EP1652228A2 (de) | 2006-05-03 |
Family
ID=34129518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04766154A Ceased EP1652228A2 (de) | 2003-08-08 | 2004-07-07 | Vorrichtung zur stabilisierung von dünnen scheiben |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1652228A2 (de) |
| WO (1) | WO2005015611A2 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03252153A (ja) * | 1990-02-28 | 1991-11-11 | Nitto Denko Corp | 半導体ウエハの保持部材 |
| JPH10233429A (ja) * | 1997-02-19 | 1998-09-02 | Nitto Denko Corp | 基板への粘着テープ貼付け装置 |
| US6140151A (en) * | 1998-05-22 | 2000-10-31 | Micron Technology, Inc. | Semiconductor wafer processing method |
| JP2000114204A (ja) * | 1998-10-01 | 2000-04-21 | Mitsubishi Electric Corp | ウエハシート及びこれを用いた半導体装置の製造方法並びに半導体製造装置 |
| US6541989B1 (en) * | 2000-09-29 | 2003-04-01 | Motorola, Inc. | Testing device for semiconductor components and a method of using the device |
| US6470946B2 (en) * | 2001-02-06 | 2002-10-29 | Anadigics, Inc. | Wafer demount gas distribution tool |
-
2004
- 2004-07-07 WO PCT/EP2004/051399 patent/WO2005015611A2/de not_active Ceased
- 2004-07-07 EP EP04766154A patent/EP1652228A2/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005015611A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005015611A2 (de) | 2005-02-17 |
| WO2005015611A3 (de) | 2005-07-07 |
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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 |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
Effective date: 20051228 |
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| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MATSCHITSCH, MARTIN Inventor name: HALLEGGER, JOHANN Inventor name: GANITZER, PAUL Inventor name: PUCHER, GERHARD Inventor name: FEICHTER, HERWIG |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INFINEON TECHNOLOGIES AG |
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| 17Q | First examination report despatched |
Effective date: 20100527 |
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| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18R | Application refused |
Effective date: 20110314 |