High crack resistance nitride process

摘要

A new method of creating a relatively thick layer of PE silicon nitride. A conventional method of creating a layer of silicon nitride applies a one-step process for the creation thereof. Film stress increases as the thickness of the created layer of PE silicon nitride increases. A new method is provided for the creation of a crack-resistant layer of PE silicon nitride by providing a multi-step process. The main processing step comprises the creation of a relatively thick, compressive film of PE silicon nitride, over the surface of this relatively thick layer of PE silicon nitride is created a relatively thin (between about 150 and 500 Angstrom) layer of tensile stress PE silicon nitride. This process can be repeated to create a layer of PE silicon nitride of increasing thickness. A layer of PE silicon nitride can in this manner be created to a thickness of about 4 mum, whereby this thick layer of PE silicon nitride is free of stress and therefor free of therefrom following cracking of the layer of PE silicon nitride.