- Patent Title: Method for manufacturing BAW resonators on a semiconductor wafer
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Application No.: US14084394Application Date: 2013-11-19
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Publication No.: US09647625B2Publication Date: 2017-05-09
- Inventor: David Petit , Sylvain Joblot , Pierre Bar , Jean-Francois Carpentier , Pierre Dautriche
- Applicant: STMicroelectronics SA , STMicroelectronics (Crolles 2) SAS
- Applicant Address: FR Montrouge FR Crolles
- Assignee: STMICROELECTRONICS SA,STMICROELECTRONICS (CROLLES 2) SAS
- Current Assignee: STMICROELECTRONICS SA,STMICROELECTRONICS (CROLLES 2) SAS
- Current Assignee Address: FR Montrouge FR Crolles
- Agency: Seed IP Law Group LLP
- Priority: FR0956868 20091001
- Main IPC: H03H3/02
- IPC: H03H3/02 ; H03H9/02 ; H03H3/04 ; H03H9/00 ; H03H9/17 ; G02F1/1337 ; G01N29/02

Abstract:
A method for manufacturing a wafer on which are formed resonators, each resonator including, above a semiconductor substrate, a stack of layers including, in the following order from the substrate surface: a Bragg mirror; a compensation layer made of a material having a temperature coefficient of the acoustic velocity of a sign opposite to that of all the other stack layers; and a piezoelectric resonator, the method including the successive steps of: a) depositing the compensation layer; and b) decreasing thickness inequalities of the compensation layer due to the deposition method, so that this layer has a same thickness to within better than 2%, and preferably to within better than 1%, at the level of each resonator.
Public/Granted literature
- US20140075726A1 METHOD FOR MANUFACTURING BAW RESONATORS ON A SEMICONDUCTOR WAFER Public/Granted day:2014-03-20
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