Abstract:
A photoacid-generating photoresist composition sensitized with an aromatic, multi-ring, heterocylcic nitrogen containing sensitizer, preferably a ring extended phenothiazine derivative. The use of the sensitizer permits exposure of photoresists to near UV irradiation where such photoresists have heretofore been exposed to deep UV irradiation. The invention is especially useful for acid hardening photoresist systems.
Abstract:
This invention describes methods for altering a substrate in a fine line image pattern using a microlithographic process including formation of a metal mask over a photoresist coating to protect the photoresist coating during dry development of the same. The invention also describes a method for formation of the metal mask. Briefly stated, the process of the invention comprises the steps of coating a substrate with a photoresist coating, exposing the photoresist coating so formed to a desired pattern of actinic radiation, catalyzing the entire surface of the photoresist coating with an electroless plating catalyst, developing the photoresist layer to a depth at least sufficient to remove the undesired catalyst layer in an image pattern, forming a metal pattern on the desired (remaining) catalyst layer and dry developing the remaning photoresist coating unprotected by the metal mask.
Abstract:
The invention is for a developer for a bilayer photoresist film comprising a first relatively thick layer of a polyglutarimide and a second relatively thin layer of a diazo sensitized novolak resin. The developer is an aqueous solution of a tetra alkyl ammonium hydroxide where at least two of the alkyl groups have two or more carbon atoms. The developer of the invention permits development of the bottom resist layer without erosion of the top resist layer.
Abstract:
Both positive and negative acting photoresist compositions are provided which contain one or more silylated poly(vinyl)phenol polymers and at least one sensitizer which forms an acid upon irradiation. The anion of such acids has an affinity for silicon.
Abstract:
A method for coating a conductive surface with an organic coating where one discrete area of the organic coating is coated onto the surface in an image pattern by conventional means and another discrete area of the organic coating is electrophoretically deposited onto the surface. The process is useful for diverse applications including the fabrication of printed circuit boards.
Abstract:
A process for the formation of a plated through-hole printed circuit board comprising treating a circuit board base material as follows:
1. condition with an oxidant solution; 2 (A). contact with a copper etchant that etches copper and neutralizes oxidant residues on the surface to be plated; and 2 (B). contact with a conditioner that conditions the board surface for enhanced catalyst adsorption; or 2 (A). contact with a neutralizer for oxidant residues that neutralizes said residues and conditions the board surface for enhance catalyst asdorption; and 2 (B). contact with a copper etchant; and 3. catalyze the board; and 4. plate electroless metal onto catalyzed surfaces from a plating solution containing a source of halide ions in a concentration of at least 0.1 moles per liter of solution. The process is characterized by the absence of a step of acceleration and contains fewer processing steps than prior art processes.
Abstract:
A method for determining the effective quantity of an organic additive in an electroplating bath involving passing an inert electrode through a predetermined sequence of voltammetric steps including a step of plating the electrode at a given applied potential, stripping the plated metal at a given applied potential, and conditioning the inert electrode without applied potential; correlating the quantity of additive with the coulombs utilized during the metal stripping step; and using the same predetermined sequence of voltammetric steps for a bath having an unknown quantity of additive.
Abstract:
A method and a system for determining the characteristics of a photoresist are disclosed. This scanning wedge method is accomplished by linearly varying the exposure dose the photoresist receives. Thereafter, the photoresist is developed. The location of interference fringes on the developed photoresist is then determined. This provides the data necessary to determine the characteristics of the photoresist.
Abstract:
A composition for stripping a photoresist from a substrate comprising a mixture of lactams where a first Lactam comprises at least 60% of the stripping solution and a second, different lactam comprises the balance. The use of the mixed lactam solution enhances the rate of removal of the resist from a substrate. The preferred lactams are pyrrolidones.