Abstract:
A method for forming a device wafer with a recyclable support by providing a wafer having first and second surfaces, with at least the first surface of the wafer comprising a semiconductor material that is suitable for receiving or forming electronic devices thereon, providing a supporting substrate having upper and lower surfaces, and providing the second surface of the wafer or the upper surface of the supporting substrate with void features in an amount sufficient to enable a connecting bond therebetween to form a construct wherein the bond is formed at an interface between the wafer and the substrate and is suitable to maintain the wafer and supporting substrate in association while forming or applying electronic devices to the first surface of the wafer, but which connecting bond is severable at the interface due to the void features to separate the substrate from the wafer so that the substrate can be reused.
Abstract:
A method of fabricating a structure that includes at least one semiconductor material for applications in microelectronics, optoelectronics or optics. The method includes transferring, onto a support made of a first material, a thin monocrystalline layer made of a second material that differs from the first material, and performing a predetermined heat treatment carrying out at least one strengthening step on a bonding interface between the thin layer and the support. The thickness of the thin layer is selected as a function of the difference between the coefficients of thermal expansion of the first and second materials and as a function of parameters of predetermined heat treatment, such that the stresses exerted by the heat treatment on the assembly of the support and the transferred thin layer leaves the assembly intact. The method further includes depositing an additional thickness of the second material in the monocrystalline state on the thin layer to thicken it. The method is useful for fabrication of hetero-substrates with a relatively thick useful layer.
Abstract:
The invention relates to a process for manufacturing a multilayer structure made from semiconducting materials that include an active layer, a support layer and an electrically insulating layer between the active layer and the support layer. The process includes the step of modifying the density of carrier traps or the electrical charge within the electrically insulating layer in order to minimize electrical losses in the structure support layer.
Abstract:
A method of producing a substrate that has a transfer crystalline layer transferred from a donor wafer onto a support. The transfer layer can include one or more foreign species to modify its properties. In the preferred embodiment an atomic species is implanted into a zone of the donor wafer that is substantially free of foreign species to form an embrittlement or weakened zone below a bonding face thereof, with the weakened zone and the bonding face delimiting a transfer layer to be transferred. The donor wafer is preferably then bonded at the level of its bonding face to a support. Stresses are then preferably applied to produce a cleavage in the region of the weakened zone to obtain a substrate that includes the support and the transfer layer. Foreign species are preferably diffused into the thickness of the transfer layer prior to implanbumtation or after cleavage to modify the properties of the transfer layer, preferably its electrical or optical properties. The preferred embodiment produces substrates with a thin InP layer rendered semi-insulating by iron diffusion.
Abstract:
A method for configuring a process for treating a semiconductor wafer. A minimum layer thickness of a transferred layer to be provided is determined to obtain a processed layer that has a preselected target thickness and target maximum density of through holes that extend completely therethrough, by conducting a predetermined finishing sequence of operations that improve the surface quality of the layer. The minimum thickness is determined such that the density of through holes remains below the target maximum density after each operation in the finishing sequence.
Abstract:
A device for use in a thermal annealing process for a wafer (T) of material chosen among the semiconductor materials for the purpose of detaching a layer from the wafer at an weakened zone. During annealing, the device applies (1) a basic thermal budget to the wafer, with the basic thermal budget being slightly inferior to the budget necessary to detach the layer, this budget being distributed in an even manner over the weakened zone; and (2) an additional thermal budget is also applied to the wafer locally in a set region of the weakened zone so as to initiate the detachment of the layer in this region.
Abstract:
A method for detaching a layer from a wafer. A weakened zone is created in the wafer to define the layer to be detached and a remainder portion of the wafer, such that the weakened zone includes a main region and a localized super-weakened region that is more weakened than the main region. Detachment of the layer from the remainder portion of the wafer is initiated at the super-weakened region such that the detachment properties to the main region to detach the layer from the remainder portion.
Abstract:
A method of manufacturing a photodetecting device, by providing a first wafer that includes a photosensitive layer made of a semiconductor material and a second wafer that includes a circuit layer of electronic components, with one of the photosensitive layer or the circuit layer incorporating a field isolation layer; bonding the first and second wafers to form a structure comprising successively the circuit layer, the field isolation layer and the photosensitive layer; and forming electrically conductive vias to electrically connect the photosensitive layer to at least some of the electronic components of the circuit layer. Also, photodetecting devices prepared by these methods.
Abstract:
A method for manufacturing a semiconductor heterostructure by first manufacturing a donor wafer having a first substrate with a first in-plane lattice parameter, a spatially graded buffer layer having a second in-plane lattice parameter, and a strained smoothing layer of a semiconductor material having a third in-plane lattice parameter which has a value between that of the first and second lattice parameters. A top layer is formed on the ungraded layer a top layer of a semiconductor material having a top surface, optionally with a superficial layer present on the top surface and having a thickness that is equal to or smaller than 10 nanometers. Next, a handle wafer of a second substrate having an insulator layer thereon is bonded with the donor wafer in such way that (a) the insulator layer of the handle wafer is bonded directly onto the top surface of the top layer of the donor wafer, or (b) the insulator layer of the handle wafer is bonded onto the superficial layer.
Abstract:
The invention relates to a method of forming a layer of elastically unstrained crystalline material intended for electronics, optics, or optronics applications, wherein the method is carried out using a structure that includes a first crystalline layer which is elastically strained under tension (or respectively in compression) and a second crystalline layer which is elastically strained in compression (or respectively under tension), with the second layer being adjacent to the first layer. The method includes a step of diffusion between the two layers so that the differences between the respective compositions of the two layers is progressively reduced until they are substantially the same, so that the two layers then form just a single final layer of crystalline material having a composition which, in aggregate, is uniform, and wherein the respective compositions, thicknesses, and degrees of strain of the two layers are initially selected so that, after diffusion, the material then constituting the final layer no longer, in aggregate, exhibits elastic strain. The diffusion can be accomplished by heat treating the structure.