Quantum Dot Superlattice Structure for Higher Carrier Mobility
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Solution Overview
Problem
Current semiconductor devices do not fully leverage advanced materials and processing techniques to achieve optimal performance in terms of charge carrier mobility and energy band engineering.
Innovation Solution
The semiconductor device incorporates a superlattice structure with stacked groups of semiconductor and non-semiconductor monolayers, along with embedded quantum dots, to reduce the effective mass of charge carriers and enhance mobility, while also providing insulating and barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional semiconductor structures are used, then manufacturing is simpler, but charge carrier mobility is lower
Solution Approach 1:
The semiconductor structure is divided into multiple thin monolayer sheets stacked in sequence, creating a superlattice structure. Each monolayer has a thickness of less than one micrometer, allowing independent optimization of material properties in each layer while maintaining overall structural integrity. This segmentation enables enhanced charge carrier mobility through the stacked configuration without requiring complete redesign of the entire device architecture.
Solution Approach 2:
The invention employs composite material structures where different semiconductor materials are combined in alternating monolayers. Each monolayer can be composed of different materials with optimized properties for specific functions, creating a composite superlattice structure that achieves higher charge carrier mobility than single-material conventional structures while managing the increased complexity through systematic material selection.
2Reliability
If advanced superlattice structures are implemented, then charge carrier mobility is enhanced, but manufacturing complexity increases
Solution Approach 1:
The invention optimizes critical parameters including monolayer thickness (less than one micrometer), stacking sequence, and material composition ratios to achieve enhanced device performance. By systematically varying these parameters during the manufacturing process, the superlattice structure achieves superior charge carrier mobility and reliability while maintaining compatibility with existing manufacturing capabilities through controlled parameter adjustment rather than fundamental process changes.
3Speed
If monolayer thickness is reduced to enhance mobility, then charge carrier scattering is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The manufacturing process incorporates preliminary preparation steps including substrate conditioning, nucleation layer formation, and controlled deposition parameters established before final monolayer growth. These preliminary actions ensure that each monolayer achieves the required thickness precision (less than one micrometer) and structural quality, reducing charge carrier scattering while managing manufacturing precision requirements through proactive process control rather than reactive correction.
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 configuration results in higher charge carrier mobility, reduced scattering effects, and improved device performance, including enhanced conductivity and potential for direct energy bandgap structures suitable for opto-electronic devices.
Implementation Method 1
The superlattice may include a plurality of stacked groups of layers, with each group of layers including a plurality of stacked base semiconductor monolayers defining a base semiconductor portion, and at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions
Implementation Method 2
a superlattice structure with stacked groups of semiconductor and non-semiconductor monolayers, along with embedded quantum dots, to reduce the effective mass of charge carriers and enhance mobility
Data Source
AI summary
A semiconductor device may include at least one semiconductor layer including a superlattice therein. The superlattice may include a plurality of stacked groups of layers, with each group of layers including stacked base semiconductor monolayers defining a base semiconductor portion, and at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions. The semiconductor device may further include quantum dots spaced apart in the at least one semiconductor layer above the superlattice and including a different semiconductor material than the semiconductor layer.