Modular Semiconductor Wafer Masking for Flexible IC Production
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Solution Overview
Problem
The semiconductor industry faces challenges in efficiently manufacturing integrated circuits (ICs) with varying functionalities and configurations using existing photomask sets, which are costly and inflexible in accommodating different product requirements.
Innovation Solution
A method utilizing a subset of lower level masks to form modular units of circuit structures on a semiconductor wafer, with specific subsets of upper level masks defining intra-unit and inter-unit connections, allowing for the selection of masks based on final IC product composition requests to form either single or multiple modular units without dicing between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complete set of photomasks is designed for each specific IC product configuration, then the manufacturing precision and product functionality are ensured, but the non-recurring engineering costs increase significantly and manufacturing flexibility decreases
Solution Approach 1:
The photomask set is segmented into modular components: lower level masks that form common circuit structures shared across multiple products, and upper level masks that define product-specific configurations and interconnections. This segmentation allows the lower level masks to be reused across different IC products while upper level masks are selectively applied based on the desired product configuration, thereby reducing NRE costs while maintaining manufacturing precision.
Solution Approach 2:
The lower level masks are designed with universal applicability to form common circuit structures that can be shared across multiple IC product variants. These masks perform the multi-function of creating baseline circuitry that serves as a foundation for different product configurations, eliminating the need to design complete separate photomask sets for each product and thus reducing engineering costs while maintaining precision through standardized design.
2Reliability
If multiple complete photomask sets are maintained for different IC products, then each product's specific requirements are met, but the manufacturing complexity and inventory requirements increase
Solution Approach 1:
The photomask library is segmented into hierarchical levels where lower level masks form universal circuit structures and upper level masks provide product-specific variations. This segmentation simplifies mask set management by organizing masks into reusable modules rather than maintaining complete separate sets for each product, reducing inventory complexity while ensuring each product's specifications are met through appropriate mask selection and combination.
Solution Approach 2:
Multiple product configurations share common lower level masks that are merged into a single universal mask set. This merging approach consolidates the photomask inventory by combining common circuit structure definitions across different products, reducing the total number of masks needed while maintaining the ability to produce multiple product variants through selective application of upper level masks.
3Manufacturing precision
If photomask sets are customized for each IC product variant, then the interconnection requirements are precisely met, but the production time and cost efficiency decrease
Solution Approach 1:
The lower level masks perform preliminary action by pre-forming common circuit structures and interconnection patterns that are shared across multiple IC products. This preliminary structuring eliminates the need to redesign and manufacture complete custom photomask sets for each product variant, thereby maintaining interconnection accuracy through standardized designs while significantly improving manufacturing throughput by reducing setup time and mask fabrication requirements.
Solution Approach 2:
The photomask system transitions from a static, product-specific approach to a dynamic, configurable approach where upper level masks can be selectively applied to the universal lower level structure based on the desired interconnection pattern. This dynamic flexibility allows rapid reconfiguration for different product variants without sacrificing interconnection accuracy, as the precise interconnection requirements are met through the selective combination of pre-engineered mask modules.
Data Source
AI summary
Aspects of the disclosure provide a method for semiconductor wafer manufacturing. The method includes utilizing a subset of lower level masks in a mask set to form multiple modular units of lower level circuit structures on a semiconductor wafer. The mask set includes the subset of lower level masks and at least a first subset of upper level masks and a second subset of upper level masks. The first subset of upper level masks defines intra-unit interconnections. The second subset of upper level masks defines both intra-unit interconnections and inter-unit interconnections. The method further includes selecting one of at least the first subset of upper level masks and the second subset of upper level masks based on a composition request of a final integrated circuit (IC) product and utilizing the selected subset of upper level masks to form upper level structures on the semiconductor wafer.