METHOD FOR MANUFACTURING P-TYPE GROUP III NITRIDE SEMICONDUCTOR

To increase adhesion of a through film and a photoresist mask layer.SOLUTION: A method for manufacturing a p-type group III nitride semiconductor comprises steps of: forming, on a substrate 10, a semiconductor layer 11 of n-GaN, a first through film 12 of AlN, a second through film 13 of AlO, and a...

Full description

Saved in:
Bibliographic Details
Main Authors MIZUKAMI KIYOTAKA, OZAKI MASAYOSHI, KIMURA YU
Format Patent
LanguageEnglish
Japanese
Published 04.06.2020
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:To increase adhesion of a through film and a photoresist mask layer.SOLUTION: A method for manufacturing a p-type group III nitride semiconductor comprises steps of: forming, on a substrate 10, a semiconductor layer 11 of n-GaN, a first through film 12 of AlN, a second through film 13 of AlO, and a first mask layer 14 of SiO; then, forming a second mask layer 15 of a photoresist on the first mask layer 14, which has a pattern opened in a region to be subjected to ion implantation, provided that the photoresist contains Si as a constituent element and a photosensitive resin which can endure a temperature of ion implantation in a subsequent step is used as the photoresist; then, etching the first mask layer 14 until the second through film 13 is exposed; then, performing ion implantation of Mg on the semiconductor layer 11 through the first through film 12 and the second through film 13 at a temperature of 500°C or above; then, removing a top layer from the semiconductor layer 11; and then, performing a thermal treatment to activate Mg of the ion implanted region 16 into a p-type semiconductor region 17.SELECTED DRAWING: Figure 7 【課題】スルー膜とフォトレジストからなるマスク層との密着性を高めること。【解決手段】基板10上に、n−GaNからなる半導体層11、AlNからなる第1スルー膜12、Al2O3からなる第2スルー膜13、SiO2からなる第1マスク層14を形成する。次に、第1マスク層14上に、イオン注入を行う領域に開口したパターンのフォトレジストからなる第2マスク層15を形成する。フォトレジストは、Siを構成元素として含み、後工程のイオン注入時の温度に耐えられる感光性樹脂を用いる。次に、第1マスク層14を第2スルー膜13が露出するまでエッチングする。次に、半導体層11に、第1スルー膜12、第2スルー膜13を通して500℃以上の温度でMgをイオン注入する。次に、半導体層11より上層を除去する。次に、熱処理を行ってイオン注入領域16のMgの活性化を行い、p型半導体領域17とする。【選択図】図7
Bibliography:Application Number: JP20180223662