Abstract:
A method of forming a thin, high-quality relaxed SiGe-on-insulator substrate (10) material is provided which first includes forming a SiGe or pure Ge layer on a surface of a first single crystal Si layer (14) which is present atop a barrier layer (12) that is resistant to the diffusion of Ge. Optionally forming a Si cap layer (18) over the SiGe or pure Ge layer (16), and thereafter heating the various layers at a temperature which permits interdiffusion of Ge throughtout the first single crystal Si layer (14), the optional Si cap (18) and the SiGe or pure Ge layer (16) thereby forming a substantially relaxed, single crystal SiGe layer atop the barrier layer (12). Additional SiGe regrowth and/or formation of a strained epi-Si layer may follow the above steps. SiGe-on-insulator substrate materials as well as structures including at least the SiGe-on-insulator substrate material are also disclosed herein.
Abstract:
Methods for fabricating Land Grid Array (LGA) interposer contacts that are both conducting and elastic.Also provided are LGA interposer contacts as produced by the inventive methods. Provided is LGA type which utilizes a pure unfilled elastomer button core that is covered with an electrically-conductive material that is continuous from the top surface to the bottom surface of the button structure. In order to obviate the disadvantages and drawbacks which are presently encountered in the technology pertaining to the fabrication and structure of land grid arrays using electrically-conductive interposer contacts, there isprovided both methods and structure for molding elastomer buttons into premetallized LGA carrier sheets,and wherein the non-conductive elastomer buttons are surface-metallized in order to convert them intoconductive electrical contacts.
Abstract:
The present invention provides an improved amorphization/templated recrystallization (ATR) method for fabricating low-defect-density hybrid orientation substrates. ATR methods for hybrid orientation substrate fabrication generally start with a Si layer having a first orientation bonded to a second Si layer or substrate having a second orientation. Selected regions of the first Si layer are amorphized and then recrystallized into the orientation of the second Si layer by using the second Si layer as a template. In particular, this invention provides a melt-recrystallization ATR method, for use alone or in combination with non-melt-recrystallization ATR methods, in which selected Si regions bounded by dielectric-filled trenches are induced to undergo an orientation change by the steps of preamorphization, laser-induced melting, and corner-defect-free templated recrystallization from the melt.
Abstract:
The present invention provides a method of fabricating a SiGe-on-insulator substrate in which lattice engineering is employed to decouple the interdependence between SiGe thickness, Ge fraction and strain relaxation. The method includes providing a SiGe-on-insulator substrate material comprising a SiGe alloy layer having a selected in-plane lattice parameter, a selected thickness parameter and a selected Ge content parameter, wherein the selected in-plane lattice parameter has a constant value and one or both of the other parameters, i.e., thickness or Ge content, have adjustable values; and adjusting one or both of the other parameters to final selected values, while maintaining the selected in-plane lattice parameter. The adjusting is achieved utilizing either a thinning process or a thermal dilution process depending on which parameters are fixed and which are adjustable.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for amorphization/template re-crystallization for changing orientation in the selected region of a silicon, without remaining defect of high density, by preparing an anneal process optimized to remove defects caused by damage due to injection, in a single crystal silicon. SOLUTION: The region of Si having a first crystal orientation is amorphised by iron-implantation, and is re-crystallized into the orientation of a template layer having different orientation, in an amorphising/template re-crystallization (ATR) process. A reoriented Si of low defective density in the process is formed by this method. More specifically, the invention relates to a high temperature annealing condition required for eliminating defects remaining in an Si-contained single crystal semiconductor material formed of the layer whose orientation is identical or different from the original orientation of amorphous layer by amorphising caused by ion-implantation and template re-crystallization. The main factor of that is a thermal process for removing defects remaining after initial re-crystallization annealing, in the temperature range of 1,250-1,330°C for several minutes to several hours. A reoriented Si of low defective density, formed by ATR, is provided as well for use with a hybrid orientation substrate. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a ball-limiting metallurgy (BLM) structure for flip chip connection, which is suitable for use together with a lead-free solder. SOLUTION: An interconnection structure suitable for flip chip connection of microelectronic device chips to packages has a two-, three- or four-layer ball-limiting composition. The composition includes an adhesion/reaction barrier layer and has a solder wettable layer reactive with components of a tin-containing lead-free solder. The solderable layer can be therefore totally consumed during soldering, but a barrier layer remains after being placed in contact with the lead-free solder during soldering. One or more lead-free solder balls are selectively positioned on the solder wettable layer. The lead-free solder balls comprise tin as a main component and one or more alloying components. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method of forming a substantially relaxed high-quality SiGe-on-insulator substrate material using SIMOX and Ge interdiffusion. SOLUTION: In order to form an injection rich area in a Si-containing substrate, ions are injected into Si-containing substrate at the beginning. The inplanted-ion rich region has sufficient ion concentration so that a barrier layer to disturb Ge diffusion is formed during annealing at a high temperature. Next, Ge-containing layer is formed on a surface of the Si-containing substrate, and then a heating process is performed at a temperature that enables the formation of a barrier layer, and the Ge interdiffusion. This allows a substantially relaxed single-crystal SiGe layer to be formed on the barrier layer. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an improving method of the quality of a defective semiconductor crystal in the vicinity of the surface thereof. SOLUTION: A method where amorphization step and subsequent thermal treatment step are executed on the defective semiconductor crystal material is provided. In the amorphization step, a region including the surface area of the defective semiconductor crystal material is partially or completely amorphized. Next, the thermal treatment step is executed to recrystallize the amorphized area of the defective semiconductor crystal material. Recrystallization is achieved, by re-growing the solid phase crystal from the amorphized area of the defective semiconductor crystal material. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing an SiGe-on-insulator substrate material substantially relaxed, of high quality, and capable of being used as a template for strained-silicon. SOLUTION: The SOI substrate having an ultra-thin top Si layer is used as the template for compressive strain SiGe growth. When an SiGe layer is relaxed at an enough temperature, the property of its dislocation movement is such that strain release defect moves down into the thin Si layer when an embedded oxide shows semi-viscosity behavior. The thin Si layer is consumed by oxidation of an interface of the thin Si with the embedded oxide. This can be performed by using inner oxidation at a high temperature. Therefore, the role of the original thin Si layer is to use the inner oxidation and subsequently to act as a sacrificial defective sink capable of being consumed during an SiGe alloy being relaxed. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for forming a relaxed SiGe-on-insulator substrate having improved relaxation, comparatively low defect density, and improved surface quality. SOLUTION: The method includes a step for forming a SiGe alloy layer on a surface of a first single crystal Si layer. The first single crystal Si layer has an interface with an underlay barrier layer having resistance to Ge diffusion. Next, ions are implanted into the structure, the ions forming defects by which mechanical decoupling is achieved at the interface or vicinity of the interface; then a heating step is performed to the structure including the implanted ions, by which mutual diffusion of Ge through the first single crystal Si layer and SiGe layer is achieved; thereby a SiGe layer that is substantially relaxed single crystal and homogenous is formed on the barrier layer. A SiGe-on-insulator having improved properties and a heterostructure including it are also provided. COPYRIGHT: (C)2004,JPO