Ink-jet printhead and method of manufacturing the same

A method of manufacturing an ink-jet printhead including a substrate on which an ink chamber having a predetermined volume and an opening in a ceiling thereof is formed, a nozzle formed on the substrate to correspond to the opening of the ink chamber, a heater to surround the nozzle, an interconnection layer to electrically connect to the heater, and a nozzle plate which includes a stack formed of a multi-layer insulating layer which protects the nozzle, the heater, and the interconnection layer, the method comprising:

• forming the stack of the multi-layer insulating layer having a nozzle region corresponding to the ink chamber, the heater which is buried in the stack and surrounds the nozzle region, and the interconnection layer which is connected to the heater on the substrate having a portion where the ink chamber is to be formed, obtaining the nozzle plate formed on the substrate;
• removing part of the multi-layer insulating layer corresponding to the nozzle region of the nozzle plate, and forming the nozzle which penetrates the nozzle plate;
• forming a photoresist layer on the nozzle plate to obtain a coating layer formed on the nozzle plate;
• removing photoresist from the photoresist layer in the nozzle and above the nozzle by a photolithography process including an exposure process and an etch process so that the nozzle of the nozzle plate extends through a droplet guide to form a through hole in the coating layer;
• and
• injecting an isotropic wet etchant into the nozzle formed on the nozzle plate and the coating layer to form the ink chamber in an ink chamber region below the heater.