SeOI Charge Reservoir via Bonding Interface Traps
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Solution Overview
Problem
The formation of semiconductor nano-crystals for data storage in semiconductor-on-insulator (SeOI) substrates is challenging due to difficulties in implantation and heat treatment, as the presence of the semiconductor layer complicates precision and introduces damage, and thicker trapping regions require higher voltages, making it difficult to achieve efficient data storage.
Innovation Solution
A process involving the bonding of substrates with a trapping interface formed between insulator layers, where electrically active traps are created through plasma treatment or contamination, allowing for the formation of a thin, embedded insulator layer with a tunnel and control dielectric, enabling lower voltage operation and efficient charge retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If implantation and heat treatment are used to form semiconductor nano-crystals in SeOI substrates, then data storage capability is achieved, but manufacturing precision deteriorates due to loss of precision in implanted region and creation of damage in the semiconductor film
Solution Approach 1:
The patent extracts the problematic semiconductor layer from the bonding interface region by bonding the insulator layer directly to the receiver substrate, eliminating the need for implantation through the semiconductor layer while preserving data storage capability through the trapping interface formed at the bonding interface
Solution Approach 2:
The patent introduces an insulator layer as an intermediary between the donor substrate and receiver substrate, forming a trapping interface that enables charge storage without requiring direct implantation into the semiconductor layer, thus avoiding damage to the semiconductor film
2Manufacturing precision
If a thicker trapping region is formed to ensure satisfactory homogeneity and quality, then manufacturing precision improves, but device complexity increases and higher voltages are required for operation
Solution Approach 1:
The patent changes the key parameter from trapping region thickness to trapping interface location, forming a thin insulator layer with a trapping interface at the bonding interface that achieves satisfactory homogeneity and quality without requiring thick regions or high operating voltages
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 enables the production of SeOI structures with electrically active traps at a specific depth, allowing for lower voltage data storage and improved integration density, power efficiency, and reduced production costs, while maintaining the advantages of discrete storage devices.
Implementation Method 1
electrically active traps are created through plasma treatment or contamination
Implementation Method 2
a so-called 'trapping interface' comprising electrically active traps suitable for retaining charge carriers
Implementation Method 3
The principle of these nodule memories is based on an exchange of charges between the nano-crystals and the inversion layer via a thin tunnel dielectric
Implementation Method 4
the bonding of the donor substrate on the receiver substrate
Data Source
AI summary
The present invention relates to a process for preparing semiconductor-on-insulator type structures that include a semiconductor layer of a donor substrate, an insulator layer and a receiver substrate. The process includes bonding of the donor substrate onto the receiver substrate, with at least one of the substrates being coated with an insulator layer, and forming at the bonding interface a so-called trapping interface of electrically active traps suitable for retaining charge carriers. The invention also relates to a semiconductor-on-insulator type structure that includes such a trapping interface.