Laminated film

Abstract

The present invention relates to a compound etching liquor which can be used for etching metal laminated film formed on the semiconductor substrate. Said compound etching liquor contains fluoride and oxidant. The described fluoride is at least one kind selected from metal salt or ammonium salt of hydrofluoric acid, hexafluorosilicic acid, metal salt or ammonium salt of hexafluorosilicic acid, tetrafluoroboric acid and metal salt or ammonium salt of tetrafluoroboric acid.

Description

technical field [0001] The present invention relates to an etchant composition used for metal laminated films in gate electrodes, source electrodes, drain electrodes, and the like of liquid crystal displays. Background technique [0002] Aluminum or alloys with impurities such as neodymium, silicon, or copper added to aluminum are cheap and have very low resistance, so they are used in materials such as gates, sources, and drains of liquid crystal displays. [0003] However, since the adhesion (adhesion) between aluminum or aluminum alloy and the glass substrate as the base film is somewhat poor, and it is easily corroded by chemical liquid and heat, the upper and / or lower parts of aluminum or aluminum alloy A molybdenum or molybdenum alloy film is used as a laminated film as an electrode material, and the laminated film is etched together with an etchant using phosphoric acid or the like. [0004] In recent years, molybdenum or molybdenum alloys have been attracting attent...

AI Technical Summary

Problems solved by technology

Recently, in order to prevent disconnection of the source line formed on the gate line, short circuit between the gate line and the source line, etc., it is often carried out to make the wiring on the substrate into a tapered shape (the taper angle is less than 90 degrees). (Patent Document 6), but the etchant in Patent Document 5 cannot satisfy this purpose

In addition, this etching solution also has the problem of causing damage to the glass substrate.

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