摘要:
Copolymers containing N-vinyllactam derivatives protected at 3-position are provided and represented by the following formula. The copolymers are used as a photoresist material suitable for deep uv process so that high sensitivity and resolution can be obtained. In addition, ultrafine circuits can be formed and an exceptional improvement in PED stability can be accomplished by use of the photoresist. ##STR1##
摘要:
N-vinyllactam derivatives protected at the 3-position are provided and represented by the following formula (I). These are polymerized into homo- and copolymers for use in microlithography of semiconductor manufacture. The polymers are used as a photoresist material suitable for a deep UV process so that pictures of high sensitivity and high resolution can be obtained. In addition, ultrafine circuits can be formed and an exceptional improvement in pattern formation can be accomplished through the use of the photoresist of the invention. ##STR1##
摘要:
Disclosed is an axial flow fan capable of preventing cracks from generating at parts where stress is concentrated, by improving the structure. For this, the axial flow fan includes a hub, a plurality of wings extended from an outer surface of the hub, and a reinforcing member filling a space formed between the outer surface of the hub and a front edge part of each wing.
摘要:
Disclosed is an axial flow fan capable of preventing cracks from generating at parts where stress is concentrated, by improving the structure. For this, the axial flow fan includes a hub, a plurality of wings extended from an outer surface of the hub, and a reinforcing member filling a space formed between the outer surface of the hub and a front edge part of each wing.
摘要:
The present invention relates to a polymer prepared by synthesizing monomer having a derivative of cholic acid, deoxycholic acid or lithocholic acid bonded to norbornene, and then homopolymerizing these monomer, copolymerizing these monomer with maleic anhydride, or copolymerizing these monomer, maleic anhydride and 2-hydroxyethyl 5-norbornene-2-carboxylate and/or 5-norbornene-2carboxylic acid, and its use as a photoresist. The polymer synthesized according to the present invention is dissolved in a solvent, together with a photo-acid generator, and filtered through a filter to make a photoresist solution which can be used to produce a lithographic image on a silicon wafer.
摘要:
Organometal-containing acrylate or methacrylate derivatives and photoresists comprising the polymers thereof. Unlike conventional matrix polymers of photoresist, the polymers induce a difference in silicon content between exposed regions and unexposed regions of photoresists by releasing their silicon-containing side chains with the aid of acid in a chemical amplification manner. The difference in silicon content causes the exposed regions to be etched at a different rate from that of the unexposed regions under oxygen plasma. Thus, the photoresist material makes it possible to use a microlithographic process comprising a dry development step which can advantageously prevent the deformation or collapse of patterns which is aggravated as their aspect ratio increases, as well as the photoresist is economically more favorable than a top surface imaging system to which silylation on its top surface or a multi-level resist system to which wet development on its top layer must be applied, because the microlithographic process is very simple and no solvent is released.