Etching method

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Patent Title: Etching method
Application No.: US16486272

Application Date: 2017-10-26
Publication No.: US11227771B2

Publication Date: 2022-01-18
Inventor: Junichi Ikeno , Yohei Yamada , Hideki Suzuki
Applicant: Shin-Etsu Polymer Co., Ltd. , National University Corporation Saitama University
Applicant Address: JP Tokyo; JP Saitama
Assignee: Shin-Etsu Polymer Co., Ltd.,National University Corporation Saitama University
Current Assignee: Shin-Etsu Polymer Co., Ltd.,National University Corporation Saitama University
Current Assignee Address: JP Tokyo; JP Saitama
Agency: Nath, Goldberg & Meyer
Agent Jerald L. Meyer
Priority: JPJP2017-027128 20170216
International Application: PCT/JP2017/038671 WO 20171026
International Announcement: WO2018/150638 WO 20180823
Main IPC: H01L21/306
IPC: H01L21/306 ; H01L21/02 ; H01L21/311

Abstract:

An etching method for etching a substrate using a molten alkali, wherein, while an oxide coating is formed on the surface of the substrate PL to be etched in a high-temperature oxygen-containing environment, the surface to be etched is isotropically etched to remove the oxide coating using a molten alkali AL brought into a prescribed high-temperature range.

Public/Granted literature

US20200243343A1 Etching Method Public/Granted day:2020-07-30

Information query

Espacenet

IPC分类:

H	电学
H01	基本电气元件
H01L	半导体器件；其他类目中不包括的电固体器件（使用半导体器件的测量入G01；一般电阻器入H01C；磁体、电感器、变压器入H01F；一般电容器入H01G；电解型器件入H01G9/00；电池组、蓄电池入H01M；波导管、谐振器或波导型线路入H01P；线路连接器、汇流器入H01R；受激发射器件入H01S；机电谐振器入H03H；扬声器、送话器、留声机拾音器或类似的声机电传感器入H04R；一般电光源入H05B；印刷电路、混合电路、电设备的外壳或结构零部件、电气元件的组件的制造入H05K；在具有特殊应用的电路中使用的半导体器件见应用相关的小类）
H01L21/00	专门适用于制造或处理半导体或固体器件或其部件的方法或设备
H01L21/02	.半导体器件或其部件的制造或处理
H01L21/04	..至少具有一个跃变势垒或表面势垒的器件，例如PN结、耗尽层、载体集结层
H01L21/18	...器件有由周期表Ⅳ族元素或含有/不含有杂质的AⅢBⅤ族化合物构成的半导体，如掺杂材料
H01L21/30	....用H01L21/20至H01L21/26各组不包含的方法或设备处理半导体材料的（在半导体材料上制作电极的入H01L21/28）
H01L21/302	.....改变半导体材料的表面物理特性或形状的，例如腐蚀、抛光、切割
H01L21/306	......化学或电处理，例如电解腐蚀（形成绝缘层的入H01L21/31；绝缘层的后处理入H01L21/3105）