Selector Layer Doping for Uniform Memory Cell Performance
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Solution Overview
Problem
Existing semiconductor devices face challenges in achieving uniform dopant profiles in selector layers, leading to cell-to-cell variation and increased manufacturing costs due to non-uniform dopant distribution, which affects the efficiency and reliability of memory cells.
Innovation Solution
A method is employed to form a doped selector layer with a uniform dopant profile using a single patterning process, involving tilted ion implantations in opposite directions to create a uniform dopant distribution both parallel and perpendicular to the layer surface, eliminating the need for spacer patterning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional doping methods are used to form selector layers, then manufacturing process is simpler, but dopant profile becomes non-uniform leading to cell-to-cell variation
Solution Approach 1:
The patent applies tilted ion implantation at angles (e.g., 45 degrees) relative to the substrate surface, transitioning from conventional vertical doping to angular doping. This dimensional change in the implantation approach enables uniform dopant distribution across the selector layer while maintaining process simplicity, resolving the contradiction between doping uniformity and process complexity
Solution Approach 2:
The patent modifies the ion implantation parameters by implementing multiple implantation steps with different tilt angles (e.g., +45 degrees and -45 degrees) and potentially different energy levels. By changing these process parameters, the method achieves uniform dopant profiles without requiring complex spacer patterning, thus improving manufacturing precision while controlling device complexity
2Reliability
If non-uniform dopant distribution is accepted, then manufacturing cost is reduced, but cell-to-cell variation increases affecting memory reliability
Solution Approach 1:
By tilting the ion implantation process at specific angles rather than垂直 implantation, the patent achieves uniform dopant distribution across the selector layer. This angular approach inherently provides self-alignment and uniformity without requiring additional costly patterning steps, thereby improving reliability while maintaining ease of manufacture
Solution Approach 2:
The tilted ion implantation method utilizes the geometry of the implantation process itself to achieve uniform doping. The angled approach naturally distributes dopants uniformly across the layer during the implantation process, making the system self-aligning and eliminating the need for complex spacer-based patterning, thus reducing manufacturing cost while improving cell-to-cell uniformity
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 improves cell-to-cell variation and reduces manufacturing costs by ensuring consistent dopant distribution, enhancing the performance and reliability of memory cells in semiconductor devices.
Implementation Method 1
forming an initial selector layer by performing a first ion implantation of a dopant into the dielectric material layer at a first tilt angle and by performing a second ion implantation of the dopant into the dielectric material layer at a second tilt angle
Data Source
AI summary
A semiconductor device that includes: first conductive lines; second conductive lines disposed over the first lines to be spaced apart from the first lines; and a selector layer disposed between the first lines and the second lines and including a dielectric material and a dopant doped with a uniform dopant profile.