Thin-Layer Transfer on Charge-Trapping Supports With Hydrogen Barriers
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Solution Overview
Problem
Existing methods for manufacturing semiconductor structures with charge trapping layers result in reduced radiofrequency (RF) performance due to excessive hydrogen concentration and diffusion, which neutralizes electric charge traps, especially when moderate heat treatments are used.
Innovation Solution
A manufacturing method that forms a trapping layer with a hydrogen concentration of less than 10^18 at/cm^3 and a dielectric layer with low hydrogen concentration or a barrier to prevent diffusion, all while avoiding heat treatments above 1000°C, ensuring the structure maintains compliant RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moderate heat treatments are used during manufacturing, then the structure avoids damage to temperature-sensitive components, but hydrogen diffusion increases and neutralizes charge traps, degrading RF performance
Solution Approach 1:
A low-hydrogen dielectric layer is formed on the charge trapping layer before subsequent manufacturing steps. This preliminary protective layer prevents hydrogen diffusion into the trapping layer during moderate heat treatments, preserving charge trap functionality while allowing necessary heat processing.
Solution Approach 2:
The dielectric layer acts as an intermediary barrier between external hydrogen sources and the charge trapping layer. It mediates the interaction by blocking hydrogen diffusion paths, thereby protecting the trapping layer from hydrogen-induced degradation during moderate temperature processing.
2Productivity
If high temperatures above 1000°C are applied, then manufacturing processes can be completed more quickly, but the charge trapping layer recrystallizes and loses its charge trapping capability
Solution Approach 1:
The invention changes the temperature parameter from high (>1000°C) to moderate (<1000°C) to prevent recrystallization of the charge trapping layer. This parameter adjustment maintains charge trapping capability while still enabling manufacturing processes to complete within acceptable timeframes.
3Ease of manufacture
If hydrogen-rich dielectric layers are used, then the manufacturing process is simpler and more cost-effective, but hydrogen diffuses into the trapping layer and reduces RF performance
Solution Approach 1:
The dielectric layer is engineered with specific local properties - low hydrogen concentration or hydrogen barrier characteristics - at the interface with the charge trapping layer. This localized quality control prevents hydrogen diffusion while maintaining overall manufacturing feasibility.
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
The method achieves RF performance levels within 20% of the expected values by controlling hydrogen concentration and diffusion, resulting in improved RF performance characteristics.
Implementation Method 1
a charge trapping layer placed between the support substrate and the dielectric layer
Implementation Method 2
the diffusion of the dopants or metals constituting the components risks rendering them non-functional
Data Source
AI summary
A method for manufacturing a structure comprising a thin layer transferred onto a support provided with a charge trapping layer, the method comprising the following steps: —preparing the support comprising forming the trapping layer on a base substrate, the trapping layer having a hydrogen concentration of less than 10{circumflex over ( )}18 at/cm{circumflex over ( )}; —joining the support to a donor substrate by way of a dielectric layer having a hydrogen concentration of less than 10{circumflex over ( )}20 at/cm{circumflex over ( )}3 or comprising a barrier preventing the diffusion of hydrogen toward the trapping layer or having low hydrogen diffusivity; —removing part of the donor substrate to form the thin layer; the manufacturing method exposing the structure to a temperature below a maximum temperature of 1000° C. The present disclosure also relates to a structure obtained at the end of this method.