Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/0094—Press load monitoring means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
  • B30B15/026—Mounting of dies, platens or press rams
• • 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
  • H10P72/0438—Apparatus for making assemblies not otherwise provided for, e.g. package constructions
• • 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
  • H10P72/0441—Apparatus for sealing, encapsulating, glassing, decapsulating or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/30—Mounting, exchanging or centering
  • B29C33/308—Adjustable moulds

Definitions

• This invention relates to the field of processes for manufacturing silicon wafers and relates in particular to a press suitable to perform pre-sintering or sintering of said silicon wafers.
• Pre-sintering also known by the term “wafer lamination” and sintering (“wafer sintering") are two stages of the production process of silicon wafers that can be achieved with the same dedicated press and that differ substantially from each other in the working parameters of the pressing operation, in particular the temperature .
• a press for pre-sintering or sintering silicon wafers comprises a lower block and an upper block, wherein the lower block comprises a lower base and a lower plate supported by the lower base and forming a lower surface for supporting the silicon wafers to be sintered.
• the upper block comprises an upper plate forming an upper surface facing the upper surface.
• the press is provided with actuator means suitable to translate the lower plate and/or the upper plate between an inactive position of mutual separation and an active position wherein the upper surface exerts a predetermined pressure on the silicon wafers present on the lower surface.
• An object of this invention is to propose a press of the above-described type capable of satisfying the requirements cited above.
• Said object is achieved with a pre-sintering or sintering press according to claim 1.
• FIG. 1 is a perspective view of a press according to the invention, in one embodiment
• FIG. 2 is a perspective view of a press according to the invention, in another embodiment
• FIG. 3 is a schematic elevation view of the press in Fig. 2.
• 1; 100 indicates in its entirety a press for pre-sintering or sintering silicon wafers.
• the press 1; 100 comprises a lower block 10; 110 and an upper block 12;
• the lower block 10; 110 comprises a lower base 14;
• the lower plate 16; 116 can comprise two overlapping, rigidly connected plate portions (e.g., indicated as 116a and 116b in Fig. 2 and 3), the upper portion 116a, on which the silicon wafers rest, being a heated plate, the upper portion 116b, in contact with the load cells, being maintained at a lower temperature.
• the upper block 12; 112 comprises an upper plate 18; 118 forming an upper surface 18'; 118' facing the lower surface 16'; 116'.
• the press is provided with actuator means, for example, hydraulic or electric, suitable to translate the lower plate 16; 116 and/or the upper plate 18; 118 between an inactive position of mutual separation and an active position wherein the upper surface exerts a predetermined pressure on the silicon wafers on the lower surface.
• actuator means for example, hydraulic or electric, suitable to translate the lower plate 16; 116 and/or the upper plate 18; 118 between an inactive position of mutual separation and an active position wherein the upper surface exerts a predetermined pressure on the silicon wafers on the lower surface.
• the lower plate 16; 116 rests only on the top surface of the body 20 of at least three compression load cells supported by the lower base 14; 114 so that said top surfaces are substantially coplanar with one another.
• the lower plate 16 rests on the bodies 20 of three load cells, for example arranged at the vertices of an equilateral triangle.
• the lower plate 116 rests on the bodies 20 of four load cells, for example arranged at the vertices of a square.
• the number of load cell bodies can depend on the surface to be sintered and/or on the pressure applied to the silicon wafers.
• the body 20 of the load cells is suitable to deflect in such a way as to allow the lower plate to pivot to compensate for any non-parallelism between the lower surface and the upper surface and/or any non-parallelism between the upper surface of the silicon wafers and the lower and/or upper surface.
• the use of the body 20, or casing, of the load cells as the only supporting element of the lower plate allows perfect adhesion between the lower surface 16'; 116' and the upper surface 18'; 118'.
• the load cell body 20 is devoid of a pressure sensor. Therefore, in this case, the load cells are used exclusively as pivoting support means. [0033]In other embodiments, the load cell body 20 is equipped with a pressure sensor, for example a strain gauge, suitable to detect the pressure exerted by the upper surface on the silicon wafers.
• a pressure sensor for example a strain gauge
• the load cells perform both the function of pivoting support for the lower plate and the function of pressure sensors.
• the load cell bodies 20 have substantially the same height.
• the top surfaces of the load cell bodies are simultaneously subjected to a grinding process so that the bodies have the same height.
• the load cell bodies are identical to each other.
• the lower plate 16; 116 is held in place by means of connecting bars 22; 122, for example adjustable deflection bars.
• the connecting bars 22; 122 prevent the lower plate 16; 116, which, resting exclusively on the load cell bodies 20, would not be subjected to other constraints, from translating in an undesirable way with respect to the load cell body 20.
• each connecting bar 22; 122 connects a vertex of the bottom plate 16; 116 with the opposite vertex of the respective side of the lower base 14; 114.
• the bars 22; 122 of opposite sides of the lower block are connected in an opposite manner to their respective vertices.
• the two opposite bars connect opposite vertices of the lower plate (i.e., at the ends of the diagonal of the rectangle that defines the perimeter of the lower plate seen in plan view) to opposite vertices of the lower base.
• the connecting bars 22; 122 are connected to the lower plate 16; 116 and to the lower base 14; 114 by means of ball joints 24, so as to allow for any inclinations of the lower plate with respect to the lower base without affecting the interaction between the lower plate and the load cell body.
• the load cell body has a maximum deflection of about 0.5 mm at the nominal load.
• the press can compensate for non parallelism up to approximately 0.3 mm from edge to edge of the surface defined by the centerlines of the load cells.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
• Silicon Compounds (AREA)
• Presses And Accessory Devices Thereof (AREA)
• Powder Metallurgy (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=78086672

Family Applications (1)

Country Status (9)

Citations (4)

Family Cites Families (1)

• 2021
  • 2021-07-13 IT IT102021000018458A patent/IT202100018458A1/it unknown
  • 2021-12-28 JP JP2024501755A patent/JP7849072B2/ja active Active
  • 2021-12-28 MX MX2024000677A patent/MX2024000677A/es unknown
  • 2021-12-28 CN CN202180100562.1A patent/CN117715746A/zh active Pending
  • 2021-12-28 EP EP21844065.9A patent/EP4370320A1/en active Pending
  • 2021-12-28 US US18/577,814 patent/US20240339343A1/en active Pending
  • 2021-12-28 WO PCT/IB2021/062386 patent/WO2023285876A1/en not_active Ceased
  • 2021-12-28 CA CA3224468A patent/CA3224468A1/en active Pending
• 2022
  • 2022-02-14 TW TW111105249A patent/TW202302332A/zh unknown

Patent Citations (4)

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