Patent ID: 9530664
Filing Date: 2016-12-27
CPC Classification: H01L

Claim Text:
1. A method for manufacturing an electronic device, comprising: forming a hole in a multilayer insulator film including a first insulator layer overlying a substrate, a second insulator layer disposed between the substrate and the first insulator layer and made of a different material from the first insulator layer, the first insulator layer having a larger thickness than the second insulator layer, and a third insulator layer disposed between the second insulator layer and the substrate and made of a different material from the second insulator layer, the hole being in a tapered shape of which diameter decreases in a direction toward the substrate; and filling the hole, wherein the forming of the hole includes: partially removing the first insulator layer to form an opening passing through the first insulator layer by plasma etching using a gas of a first type containing a first component capable of etching the first insulator layer; partially removing the second insulator layer to form an opening passing through the second insulator layer by plasma etching using a gas of a second type containing a second component that is not contained in the gas of the first type and is capable of etching the second insulator layer, and a third component having a higher deposition ability than the second component; and partially removing the third insulator layer to form an opening passing through the third insulator layer by plasma etching using a gas of the first type.