Method for preparing a substrate comprising a thin layer of piezoelectric material transferred onto a support
By incorporating a plasma treatment step with a neutral gas plasma on the donor substrate before dielectric layer formation, the RF characteristics of POI substrates are enhanced, addressing the limitations of existing methods and improving component performance.
FR3164874B1Active Publication Date: 2026-06-26SOITEC SA
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Patent Information
- Application Number
- FR2024007939
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2026-06-26
- Estimated Expiration
- 2044-07-19
AI Technical Summary
Technical Problem
Existing methods for preparing piezoelectric-on-insulator (POI) substrates do not achieve optimal RF characteristics, particularly in terms of second harmonic distortion (HD2), which limits the performance of RF components.
Method used
A method involving a plasma treatment step with a neutral gas plasma, such as argon, helium, or krypton, is applied to the first face of a donor substrate before forming a dielectric layer, followed by a dielectric layer deposition, to enhance the RF characteristics of the POI substrate.
Benefits of technology
The method significantly improves the RF performance of POI substrates by reducing second harmonic distortion, achieving gains of up to -3 dBm compared to prior art processes.
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Abstract
The invention relates to a method for preparing a substrate comprising a thin layer (3) of piezoelectric material transferred onto a support (5), the method being based on Smart Cut technology comprising an implantation step (S2) of a donor substrate (1) and an assembly step (S4). According to the invention, the preparation method includes, prior to the implantation step (S2), a plasma treatment step (Sp) comprising exposing the donor substrate (1) to a plasma of a neutral gas. Figure 2
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