Combinatorial Semiconductor Reliability Testing on First Metal Layer
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Solution Overview
Problem
Conventional semiconductor processing methods are inefficient and costly due to uniform processing across entire substrates, limiting data collection and experimentation capabilities, especially for evaluating new materials and process sequences, and requiring extensive follow-up steps for reliability testing.
Innovation Solution
A combinatorial characterization tool that allows for non-uniform processing across a single substrate, enabling multiple experiments to be performed in parallel or serial, with site-isolated regions for rapid evaluation of semiconductor processing operations and materials, and performing reliability tests like VBD and TDDB directly on the first metal layer without passivation or additional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If uniform processing is applied across the entire substrate, then manufacturing consistency and control are improved, but productivity and data collection efficiency deteriorate
Solution Approach 1:
The substrate is divided into multiple independently processed regions, each subjected to different process conditions. This segmentation allows parallel experimentation across multiple process variations on a single substrate, dramatically increasing data collection efficiency while maintaining controlled processing within each region
Solution Approach 2:
Different regions of the substrate are assigned different process conditions, materials, or parameters tailored to specific experimental objectives. This local quality approach enables targeted optimization and comprehensive material evaluation without requiring uniform processing across the entire substrate
2Measurement precision
If conventional reliability testing is performed with passivation and multiple metal layers, then test accuracy is improved, but process complexity and time consumption deteriorate
Solution Approach 1:
The essential test structure is extracted to the first metal layer, eliminating the need for passivation and subsequent metal layers. This extraction maintains the core functionality of reliability testing while dramatically simplifying the process workflow and reducing the number of required layers
Solution Approach 2:
Reliability testing is performed at an earlier stage in the process flow, before passivation and additional metal layers are deposited. This preliminary action approach allows early evaluation of process conditions and materials, reducing overall test time and enabling faster iteration
3Measurement precision
If one wafer is used to evaluate a single process condition, then measurement precision is maintained, but productivity and cost efficiency deteriorate
Solution Approach 1:
A single wafer is segmented into multiple regions, each dedicated to evaluating a different process condition or material. This segmentation enables parallel evaluation of numerous conditions on one wafer, maintaining measurement precision through controlled regional processing while exponentially increasing experimentation throughput
Solution Approach 2:
The wafer serves multiple functions simultaneously - acting as both the substrate for processing and the test vehicle for reliability evaluation. By making the wafer multi-functional and capable of supporting diverse experimental conditions across its surface, the system maximizes productivity without sacrificing measurement accuracy
Data Source
AI summary
A method and system of improved reliability testing includes providing a first substrate and a second substrate, each substrate comprising only a first metallization layer; processing regions on a first substrate by combinatorially varying at least one of materials, unit processes, and process sequences; performing a first reliability test on the processed regions on the first substrate to generate first results; processing regions on a second substrate in a combinatorial manner by varying at least one of materials, unit processes, and process sequences based on the first results of the first reliability test; performing a second reliability test on the processed regions on the second substrate to generate second results; and determining whether the first substrate and the second substrate meet a predetermined quality threshold based on the second results.