Charge Layer Coating for Low-Temperature Work Function Tuning
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Solution Overview
Problem
High-temperature semiconductor processing can damage surrounding devices and create large charge gradients, reducing the area available for other device layers and decreasing performance.
Innovation Solution
The method involves coating semiconductor structures with dopants in a non-solid phase using gas-phase or liquid-phase processes, followed by a dopant diffusion process at temperatures below 450 degrees Celsius to form abrupt junction profiles and oxidation layers without altering the crystal formation, enabling precise control of charge layers and high aspect ratio structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperatures are used to alter the work function of structures, then the work function can be adjusted, but surrounding devices may be damaged and large charge gradients are formed reducing available area
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures to low temperatures (below 450°C) for the doping process. This parameter change allows work function adjustment while avoiding thermal damage to surrounding devices and preventing large charge gradient formation, thus resolving the technical contradiction between achieving precise work function control and avoiding harmful thermal effects.
Solution Approach 2:
The patent replaces the conventional thermal diffusion mechanism with a low-temperature doping process using gas-phase or liquid-phase dopant delivery. This substitution eliminates the need for high thermal energy while achieving the same doping effect, thereby preventing thermal damage to surrounding structures while maintaining manufacturing precision for work function adjustment.
2Productivity
If high temperatures are used for bulk processing, then processing can be performed, but large charge gradients are formed that reduce the area available for other device layers
Solution Approach 1:
The patent changes the temperature parameter to below 450°C and modifies the processing approach from bulk high-temperature processing to low-temperature localized doping. This enables processing capability to be maintained while preventing the formation of large charge gradients, thus preserving the area available for other device layers.
3Quantity of substance
If conventional doping processes are used, then dopants can be introduced, but high temperatures are required that may damage surrounding devices
Solution Approach 1:
The patent substitutes the conventional thermal diffusion mechanism with a low-temperature doping process using gas-phase or liquid-phase dopant delivery followed by oxidation-driven diffusion. This substitution enables dopant introduction while eliminating high-temperature thermal damage to surrounding devices.
Solution Approach 2:
The patent introduces an oxidation process as an intermediary mechanism to drive dopant diffusion at low temperatures. The oxidation process acts as a mediator that enables dopant introduction without requiring high thermal energy, thus preventing thermal damage while achieving the desired doping effect.
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 increases charge manipulation capabilities, maintains low thermal budgets, and prevents thermal damage, resulting in high-performance charge layers with ultra-high activated doping levels and improved quantum efficiencies.
Implementation Method 1
performing a dopant diffusion process using an oxidation process to drive the dopants through the surfaces the structure to embed the dopants in the structure
Implementation Method 2
performing a dopant diffusion process using an oxidation process to drive the dopants through the surfaces the structure to embed the dopants in the structure to adjust the work function of the structure near the surfaces to form an abrupt junction profile and form an oxidation layer on the surfaces of the structure
Implementation Method 3
coating surfaces of the structure to form a doping layer in a non-solid phase that contains dopants on the surfaces of the structure
Data Source
AI summary
Methods for adjusting a work function of a structure in a substrate leverage near surface doping. In some embodiments, a method for adjusting a work function of a structure in a substrate may include coating surfaces of the structure to form a doping layer in a non-solid phase that contains dopants on the surfaces of the structure and performing a dopant diffusion process using an oxidation process to drive the dopants through the surfaces the structure to embed the dopants in the structure to adjust the work function of the structure near the surfaces to form an abrupt junction profile and form an oxidation layer on the surfaces of the structure. The coating of the surfaces of the structure may be performed using a gas-phase or liquid-phase process.