Abstract:
Polycrystalline silicon germanium (SiGe) can offer excellent etch selectivity to silicon during cryogenic deep reactive ion etching in an SF6/O2 plasma. Etch selectivity of over 800:1 (Si:SiGe) may be achieved at etch temperatures from -80 degrees Celsius to -140 degrees Celsius. High aspect ratio structures with high resolution may be patterned into Si substrates using SiGe as a hard mask layer for construction of microelectromechanical systems (MEMS) devices and semiconductor devices.
Abstract:
Fabrication method. At least first and second hardmasks are deposited on a substrate, the thickness and materials of the first and second hardmask selected to provided etch selectivity with respect to the substrate. A nanoscale pattern of photoresist is created on the first hardmask and the hardmask is etched through to create the nanoscale pattern on a second hardmask. The second hardmask is etched through to create the desired taper nanocone structures in the substrate. Reactive ion etching is preferred. A glass manufacturing process using a roller imprint module is also disclosed.
Abstract:
Methods for fabricating of high aspect ratio probes and deforming micropillars and nanopillars are described. Use of polymers in deforming nanopillars and micropillars is also described.
Abstract:
A MEMS comprising a sacrificial structure, which comprises a faster etching portion and a slower etching portion, exhibits reduced damage to structural features when in forming a cavity in the MEMS by etching away the sacrificial structure. The differential etching rates mechanically decouple structural layers, thereby reducing stresses in the device during the etching process. Methods and systems are also provided.
Abstract:
Die Erfindung betrifft ein Verfahren zum selektiven Ätzen einer SiGe-Mischhalbleiterschicht auf einem Silizium-Halbleitersubstrat durch trockenchemisches Ätzen der SiGe-Mischhalbleiterschicht mittels eines Ätzgases ausgewählt aus der Gruppe umfassend ClF 3 und/oder ClF 5 , wobei man dem Ätzgas ein Gas ausgewählt aus der Gruppe umfassend Cl 2 und/oder HCl zusetzt.
Abstract:
A method for forming a hollow microneedle structure includes processing the front side of a wafer (10) to form at least one microneedle (30) projecting from a substrate with a first part (18) of a through-bore, formed by a dry etching process, passing through the microneedle and through a part of a thickness of the substrate. The backside of the wafer (10) is also processed to form a second part (16) of the through-bore by a wet etching process.