Abstract:
La présente invention concerne un procédé de fabrication d'une structure de type semi-conducteur sur isolant, comprenant les étapes suivantes : - fourniture d'un substrat donneur (1) comprenant une zone de fragilisation délimitant une couche à transférer, - fourniture d'un substrat receveur (2), - collage du substrat donneur (1) sur le substrat receveur (2), la couche à transférer étant située du côté de l'interface de collage (10), par initiation d'une onde de collage (3) à partir d'une première région (13) de la périphérie (11) de ladite interface et propagation de ladite onde vers une seconde région (14) de la périphérie (11) de ladite interface opposée à la première région (13), la vitesse de propagation de l'onde de collage (3) étant plus faible dans ladite partie centrale (12) que dans ladite partie périphérique (11), - détachement du substrat donneur (1) le long de la zone de fragilisation pour transférer la couche à transférer sur le substrat receveur (2), ledit procédé étant caractérisé en ce que le collage est mis en œuvre dans des conditions contrôlées pour augmenter la différence de vitesse de propagation de ladite onde de collage entre la partie périphérique (11) et la partie centrale (12) de l'interface de collage (10).
Abstract:
The invention relates to a method for correcting misalignment of positions on a first wafer bonded to a second wafer, the method comprising the application (F4), to coordinates of each position, of a predetermined correction function for the said first wafer, the correction applied by the correction function being a function only of the distance of the position relative to the centre of the first wafer, characterized in that the applied correction varies, over the whole of the first wafer, in a non-linear manner with respect to the distance of the position relative to the centre.
Abstract:
Procédé de fabrication d'une structure piézoélectrique (10, 10'), ledit procédé étant caractérisé en ce qu'il comprend la fourniture d'un substrat de matériau piézoélectrique (20), la fourniture d'un substrat support (100), le dépôt d'une couche de collage (1001) diélectrique à une température inférieure ou égale à 300°C sur une seule face du substrat de matériau piézoélectrique (20), une étape d'assemblage (1') du substrat de matériau piézoélectrique (20) sur le substrat support (100) par l'intermédiaire de la couche de collage (1001) diélectrique, une étape d'amincissement (2') pour former la structure piézoélectrique (10, 10') comprenant une couche de matériau piézoélectrique (200) assemblé à un substrat support (100).
Abstract:
The invention relates to a semiconductor on insulator substrate (1) for use in RF applications, in particular a silicon on insulator substrate, comprising a semiconductor top layer (11), a buried oxide layer (9) and a passivation layer (7) over a silicon support substrate (3) and a corresponding method. The invention also relates to an RF device (17). In addition a penetration layer (5) is introduced between the passivation layer (7) and the silicon support substrate (3) to ensure sufficient high resistivity of underneath RF features while dislocation movements in the support substrate (3) can be kept low.
Abstract:
The invention provides a method of bonding a first wafer (202) onto a second wafer (206) by molecular adhesion, the method comprising applying a point of initiation (216) of a bonding wave between said first (202) and second (206) wafers, the method further comprising projecting a gas stream (228) between the first wafer (202) and the second wafer (206) generally towards the point of initiation(216) of the bonding wave while the bonding wave is propagating between the wafers. The invention also provides a bonding apparatus (215) for carrying out said bonding method.
Abstract:
Method for producing a composite structure (200), comprising the direct bonding of at least one first wafer (220) with a second wafer (230), and comprising a step of initiating the propagation of a bonding wave, where the bonding interface between the first and second wafers (220, 230) after the propagation of said bonding wave has a bonding energy of less than or equal to 0.7 J/m2. The step of initiating the propagation of the bonding wave is performed under one or more of the following conditions: - placement of the wafers in an environment at a pressure of less than 20 mbar, - application to one of the two wafers of a mechanical pressure of between 0.1 MPa and 33.3 MPa. The method further comprises, after the step of initiating the propagation of a bonding wave, a step of determining the level of stress induced during bonding of the two wafers, said level of stress being determined on the basis of a stress parameter Ct calculated using the formula Ct = Rc/Ep, where: Rc corresponds to the radius of curvature (in km) of the two- wafer assembly and Ep corresponds to the thickness (in μm) of the two-wafer assembly. The method further comprises a step of validating the bonding when the level of stress Ct determined is greater than or equal to 0.07.
Abstract:
An apparatus (200) for direct wafer bonding between two wafers (20, 30) comprises at least one wafer carrier device (210) comprising a support (211) constituted a support element (2110) for receiving one of the two wafers, and aligning elements (220, 230, 240) placed around said chuck. The support element (2110) of the chuck (211) has an overall contact surface area that is smaller than the surface area of the wafer (20) to be supported by the support element (2110).
Abstract:
The present invention relates to a heterostructure, in particular a piezoelectric structure, comprising a cover layer, in particular a layer of piezoelectric material, the material of the cover layer having a first coefficient of thermal expansion, assembled to a support substrate, the support substrate having a second coefficient of thermal expansion substantially different from the first coefficient of thermal expansion, at an interface wherein the cover layer comprises at least a recess extending from the interface into the cover layer, and its method of fabrication.