The Study of Reactive Ion Etching of Heavily Doped Polysilicon Based on HBr/O<sub>2</sub>/He Plasmas for Thermopile Devices

Heavily doped polysilicon layers have been widely used in the fabrication of microelectromechanical systems (MEMS). However, the investigation of high selectivity, anisotropy, and excellent uniformity of heavily doped polysilicon etching is limited. In this work, reactive ion etching of undoped and...

Full description

Bibliographic Details
Main Authors: Na Zhou, Junjie Li, Haiyang Mao, Hao Liu, Jinbiao Liu, Jianfeng Gao, Jinjuan Xiang, Yanpeng Hu, Meng Shi, Jiaxin Ju, Yuxiao Lei, Tao Yang, Junfeng Li, Wenwu Wang
Format: Article
Language:English
Published: MDPI AG 2020-09-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/13/19/4278
Description
Summary:Heavily doped polysilicon layers have been widely used in the fabrication of microelectromechanical systems (MEMS). However, the investigation of high selectivity, anisotropy, and excellent uniformity of heavily doped polysilicon etching is limited. In this work, reactive ion etching of undoped and heavily doped polysilicon-based hydrogen bromide (HBr) plasmas have been compared. The mechanism of etching of heavily doped polysilicon is studied in detail. The final results demonstrate that the anisotropy profile of heavily doped polysilicon can be obtained based on a HBr plasma process. An excellent uniformity of resistance of the thermocouples reached ± 2.11%. This technology provides an effective way for thermopile and other MEMS devices fabrication.
ISSN:1996-1944