Semiconductor Channel Crystallization With Controlled Metal Ion Seeding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor memory technologies face challenges in enhancing channel mobility and reducing threshold voltage in three-dimensional semiconductor memory devices, particularly due to limitations in crystallization processes and the presence of metal elements that can increase leak currents.
Innovation Solution
A manufacturing method involving the use of a compound with an alkoxysilyl or silanol group and a cation-capturing organic group to modify the semiconductor layer, followed by treatment with a metal ion-containing solution, washing, drying, and heating in a non-oxidizing atmosphere, which facilitates low-temperature crystallization of the channel semiconductor layer with controlled metal element concentration, thereby increasing grain diameter and reducing leak currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional crystallization processes are used in three-dimensional semiconductor memory devices, then manufacturing is simpler, but channel mobility is insufficient and threshold voltage cannot be adequately reduced
Solution Approach 1:
The patent applies parameter changes by controlling the crystallization temperature to be lower than conventional processes and precisely controlling metal element concentration (0.1-10 at%) in the semiconductor layer. This enables induced lateral crystallization that achieves both enhanced channel mobility and proper threshold voltage control while maintaining manufacturability through a systematic process modification rather than complete process redesign
Solution Approach 2:
The patent introduces metal elements (such as Ni, Pd, Pt, Au, Cu, Ag) as intermediary substances that act as nucleation sites and catalysts for crystallization. These metal elements mediate between the amorphous semiconductor layer and the desired crystalline structure, enabling controlled crystallization at lower temperatures while achieving the desired electrical characteristics without requiring complex high-temperature processing
2Reliability
If metal elements are added to enhance crystallization, then grain diameter increases and channel mobility improves, but leak currents increase
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the concentration parameter of metal elements to fall within the optimal range of 0.1-10 at%. This parameter control ensures sufficient metal content for effective crystallization and grain growth (improving channel mobility) while preventing excessive metal accumulation that would cause harmful leak currents, thus achieving an optimal balance between benefits and harms
Solution Approach 2:
The patent applies local quality by distributing metal elements specifically at grain boundaries and as nucleation sites rather than uniformly throughout the entire semiconductor layer. This localized distribution enables effective crystallization initiation and grain growth in critical regions while minimizing the overall metal content that would otherwise generate leak currents throughout the device structure
3Reliability
If high-temperature crystallization is used, then complete crystallization is achieved, but manufacturing complexity and energy consumption increase
Solution Approach 1:
The patent introduces metal elements as intermediary substances that lower the crystallization temperature requirement. These metal elements act as nucleation sites that enable crystallization to proceed at reduced temperatures compared to conventional pure semiconductor crystallization, thereby reducing the energy input required while still achieving complete crystallization of the semiconductor layer
Solution Approach 2:
The patent applies parameter changes by shifting the crystallization temperature parameter from conventional high-temperature processes to lower temperatures enabled by metal element addition. This parameter modification reduces the energy consumption of the crystallization process while maintaining crystallization completeness, as the metal elements facilitate the phase transition at these reduced temperatures
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 method enhances channel mobility and decreases threshold voltage in three-dimensional semiconductor memory devices by promoting grain growth in the channel semiconductor layer, reducing leak currents, and allowing for precise adjustment of threshold voltage.
Implementation Method 1
modifying a surface of a semiconductor layer with a compound having an alkoxysilyl group or a silanol group at one end and a cation-capturing organic group at the other end
Implementation Method 2
treating the surface of the modified semiconductor layer with a metal ion-containing solution
Implementation Method 3
heating the surface of the dried semiconductor layer in a non-oxidizing atmosphere... facilitates low-temperature crystallization of the channel semiconductor layer
Implementation Method 4
heating the surface of the dried semiconductor layer in a non-oxidizing atmosphere
Data Source
AI summary
A method for manufacturing a semiconductor device according to an embodiment includes: modifying a surface of a semiconductor layer using a compound having an alkoxysilyl group or a silanol group at one end and a cation-capturing organic group at the other end; treating the surface of the modified semiconductor layer with a metal ion-containing solution; washing the surface of the treated semiconductor layer; drying the surface of the washed semiconductor layer; and heating the surface of dried semiconductor layer in a non-oxidizing atmosphere.