摘要:
A system for measuring the thickness of a wafer while it is being thinned this disclosed. The system and method provide integrating an optical reflectometer into a common wafer thinning apparatus. Using reflected optical signals from the top and bottom of the wafer, the thickness of the wafer is determined with time based calculations in real-time while thinning is occurring. Once the desired thickness has been reached, the thinning operation is halted. By performing the measurement in-situ, this system and a method prevent scrapping of wafers which are overthinned and the reloading of wafers which are too thick. Since an optical reflectometer is used, the measurement is contactless, and thus prevents possible damage to wafers during measurement.
摘要:
Compliant standoffs are disposed on a support surface of a semiconductor or hybrid semiconductor device. The standoffs extend further from the support surface than other active or passive structures associated with the (hybrid) semiconductor device, and are spaced at least a minimum distance from such associated structures. Each compliant standoff provides a surface at which auxiliary devices, such as optical subassemblies, lightwave circuits and the like, can be attached. Since the compliant standoffs extend further from the support surface than other associated structures, such other associated structures are protected from potentially damaging contact with the auxiliary device(s) being attached to the compliant standoffs. Moreover, since the compliant standoffs are spaced from such other asociated structures, potentially damaging thermal and mechanical stresses (imparted to the standoffs as a result of the contact with an auxiliary device such as during bonding) are substantially dissipated by the compliant standoff and directed into the support rather than the other associated structures. The compliant standoffs advantageously comprise conductive materials such that they may be placed in ohmic electrical contact with at least one active region of the (hybrid) semiconductor device.
摘要:
A method of calibrating an interferometer system and a multilayer thin film used for calibrating the interferometer system. The method including measuring the step height of a gold step with the interferometer system, the multilayer thin film comprising a gold layer that defines the gold step. The multilayer thin film having an optical flat, a first layer on the surface of the optical flat, a second layer on the first layer, a test layer on a part of the second layer, and a gold layer on the test layer and on a part of the second layer uncovered by the test layer. The test layer having a test layer step, and the gold layer having a gold step over the test layer step. Also, a reference standard and a method of making the reference standard for a thin film sample with one or more component thin film layers, the reference standard having a gold layer over the surface of the thin film sample.
摘要:
The specification describes an analytical technique for determining trace levels of copper in a background matrix of titanium by dissolving the titanium and the copper impurity in HF, then selectively depositing the copper on a clean silicon surface. The silicon surface is then analyzed for the trace level of copper.
摘要:
An improved method and composition for achieving a kinetically-controlled solder bond is disclosed having particular application to the fabrication of hybrid integrated circuits and optical subassemblies. The method involves the use of a solder layer, a quenching layer, and a control layer disposed between the solder layer and quenching layer, in which the control layer is advantageously comprised of a thin film of platinum. Additionally, a barrier layer, also preferably comprised of a thin film of platinum, is disposed between the solder layer and the parts to be bonded to prevent the oxidation of solder materials during the soldering process or later storage of the soldered parts.
摘要:
An improved method and solder composition for kinetically controlled part bonding. The method involves applying at least a first chemical element layer of an intermetallic compound to a first part and applying at least a second chemical element layer of the intermetallic compound to a second part. The first and second parts are placed together so that the chemical element layers contact each other. The parts are heated from a storage temperature to a bonding temperature which is slightly above a first melting temperature that melts the chemical element layer of one of the first and second parts into a liquid mixture. The composition of liquid mixture varies with time during heating due to the formation of the intermetallic compound therein by progressive incorporation of the other one of the first and second chemical element layers into the mixture. The melting temperature of the liquid mixture increases with time as the composition changes until the melting temperature of the liquid mixture is about equal to the bonding temperature thereby soldifying the liquid mixture into a bond. The parts are then held at a holding temperature which is higher than the storage temperature to maintain diffusion of the other one of the first and second chemical element layers into the bond. This forms a quantity of the intermetallic compound in the bond which is sufficient to raise the melting temperature of the bond to a desired usage temperature that is substantially above the first melting temperature. The intermetallic compound is typically composed of a ternary solder composition.
摘要:
An improved method and solder composition for kinetically controlled part bonding. The method involves applying at least a first chemical element layer of an intermetallic compound to a first part and applying at least a second chemical element layer of the intermetallic compound to a second part. The first and second parts are placed together so that the chemical element layers contact each other. The parts are heated from a storage temperature to a bonding temperature which is slightly above a first melting temperature that melts the chemical element layer of one of the first and second parts into a liquid mixture. The composition of liquid mixture varies with time during heating due to the formation of the intermetallic compound therein by progressive incorporation of the other one of the first and second chemical element layers into the mixture. The melting temperature of the liquid mixture increases with time as the composition changes until the melting temperature of the liquid mixture is about equal to the bonding temperature thereby soldifying the liquid mixture into a bond. The parts are then held at a holding temperature which is higher than the storage temperature to maintain diffusion of the other one of the first and second chemical element layers into the bond. This forms a quantity of the intermetallic compound in the bond which is sufficient to raise the melting temperature of the bond to a desired usage temperature that is substantially above the first melting temperature. The intermetallic compound is typically composed of a ternary solder composition.