SOI Wafer Crystalline State Control for RF Linearity
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Solution Overview
Problem
High-frequency semiconductor circuits built on silicon-on-insulator (SOI) substrates face significant distortion issues due to substrate contributions, which existing methods have not adequately addressed, particularly in RF switches, tuners, and receivers, where high linearity is required to prevent intermodulation products and harmonic distortion.
Innovation Solution
The method involves implanting a first material on a substrate to change its crystalline structure, depositing a trap-rich layer, and bonding an insulator layer, followed by thermal annealing, where the implanted material maintains the new crystalline state and inhibits re-crystallization, thereby reducing surface conduction and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal annealing is performed on integrated circuit devices formed on SOI substrates, then device performance is improved, but the crystalline structure of the substrate re-crystallizes, causing surface conduction and distortion in high-frequency circuits
Solution Approach 1:
The substrate is implanted with a first material (such as silicon, germanium, or carbon) before device formation and annealing processes. This preliminary implantation creates a damaged or non-crystalline layer that maintains its amorphous state during subsequent thermal annealing, preventing re-crystallization and the associated surface conduction problems while allowing device performance improvement
Solution Approach 2:
The implanted material acts as an intermediary that modifies the substrate's response to thermal annealing. By introducing foreign atoms into the substrate lattice, the material interferes with the re-crystallization process, maintaining the non-crystalline state that suppresses surface conduction while permitting beneficial annealing effects on the devices
2Object-affected harmful factors
If the substrate crystalline structure is altered to suppress surface conduction, then distortion is reduced, but the manufacturing process complexity increases
Solution Approach 1:
The invention changes the physical-chemical parameters of the substrate by implanting specific materials at controlled concentrations and depths. By adjusting implantation energy, dose, and material selection, the substrate's crystalline state is modified to maintain amorphous structure during annealing, reducing distortion without requiring fundamentally new manufacturing processes
Solution Approach 2:
The implanted material is concentrated in a specific region of the substrate (the damaged or non-crystalline layer) rather than being uniformly distributed throughout. This localized modification affects only the surface region where surface conduction occurs, leaving the bulk substrate properties intact and simplifying the overall manufacturing approach
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces distortion in high-frequency circuits by maintaining the altered crystalline state during annealing, suppressing surface conduction, and simplifying the semiconductor fabrication process, while enhancing the performance of integrated circuit devices on SOI substrates.
Implementation Method 1
a first side of a substrate is implanted with a first material to change a crystalline structure of the first side of the substrate from a first crystalline state to a second crystalline state
Implementation Method 2
The integrated circuit devices are thermally annealed. The first material maintains the second crystalline state of the first side of the substrate during the annealing.
Implementation Method 3
A second material is deposited on the first side of the substrate, after the first material is implanted
Data Source
AI summary
According to a method herein, a first side of a substrate is implanted with a first material to change a crystalline structure of the first side of the substrate from a first crystalline state to a second crystalline state, after the first material is implanted. A second material is deposited on the first side of the substrate, after the first material is implanted. A first side of an insulator layer is bonded to the second material on the first side of the substrate. Integrated circuit devices are formed on a second side of the insulator layer, opposite the first side of the insulator layer, after the insulator layer is bonded to the second material. The integrated circuit devices are thermally annealed. The first material maintains the second crystalline state of the first side of the substrate during the annealing.