Modular Doping Seed Pods for Precise Semiconductor Melt Charging
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Solution Overview
Problem
Existing systems for adding dopants to semiconductor melts during Czochralski crystal growth lack precise control, leading to undercharge or overcharge, resulting in ingots with undesired properties.
Innovation Solution
A modular doping seed system comprising a reusable chuck adapter, sacrificial spacer, and a series of doping pods, which allows for controlled and customizable dopant delivery by reusing the adapter and consuming the pods during the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dopant feed tubes or other methods are used to add dopant to the melt, then dopant can be added to the melt, but the amount of dopant added cannot be adequately controlled, leading to undercharge or overcharge
Solution Approach 1:
The doping seed is divided into multiple modular doping pods that can be independently attached and detached. Each pod contains a specific amount of dopant, allowing precise control over the total dopant amount by selecting and attaching the appropriate number of pods to the doping seed, thereby eliminating undercharge or overcharge issues.
Solution Approach 2:
The dopant is pre-loaded into the doping pods before the crystal growth process. This preliminary preparation allows the dopant amount to be precisely controlled and predetermined, ensuring accurate dopant delivery to the melt without the need for real-time adjustment or measurement during the growth process.
2Ease of manufacture
If a one-piece doping seed is used, then dopant delivery can be achieved, but the cost increases due to consumption of the entire seed and the need for frequent replacements
Solution Approach 1:
The doping seed is segmented into a reusable adapter portion and disposable doping pods. The adapter can be reused across multiple doping operations, while only the pods are consumed. This segmentation significantly reduces the overall consumption of doping seed material and lowers operational costs compared to using complete one-piece seeds that must be replaced entirely.
Solution Approach 2:
The adapter portion of the doping seed is designed to be recovered and reused, while the doping pods are discarded after single use. This selective discarding and recovering approach minimizes material waste and reduces the frequency of replacements, thereby lowering operational costs and improving process efficiency.
3Productivity
If multiple doping pods are connected in series, then scalable dopant delivery is achieved, but the device complexity increases
Solution Approach 1:
The doping system is segmented into standardized modular pods that all use identical connection interfaces. This standardization simplifies the overall structure despite the modular architecture, as each pod is interchangeable and uses the same coupling mechanism, making the system easy to assemble and disassemble while maintaining scalability.
Solution Approach 2:
The doping pods are designed with universal connection features that allow them to be attached to both the adapter and to each other in a standardized manner. This universality simplifies the coupling mechanism and reduces design complexity, as the same interface design is used throughout the entire system, making scalability achievable without proportionally increasing complexity.
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
The system reduces costs and minimizes dopant delivery errors by enabling precise dopant addition, allowing for scalable and efficient production of single crystal ingots with desired properties.
Implementation Method 1
Each pod of the plurality of doping pods includes a body that extends from a first end to a second end and defines a dopant chamber for receiving dopant therein
Implementation Method 2
a sacrificial spacer connected to the reusable chuck adapter proximate the second end of the reusable chuck adapter
Data Source
AI summary
A modular doping seed for charging dopant to a melt of semiconductor material includes a reusable chuck adapter connectable to a seed chuck, a sacrificial spacer connected to the reusable chuck adapter, and a plurality of doping pods connected in series to one another and depending from the sacrificial spacer, where each pod of the plurality of doping pods defines a dopant chamber for receiving dopant therein.