Thermal Diode Array for TIM Uniformity Detection on Semiconductor Dies
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Solution Overview
Problem
Existing semiconductor devices face challenges in maintaining uniform thermal distribution due to irregularities in the thermal interface material layer, which can lead to thermal damage and reliability issues.
Innovation Solution
A thermal management system utilizing an array of thermal diodes on the semiconductor die to measure temperature differentials, allowing for the detection of spatial irregularities in the thermal interface material layer, thereby ensuring uniform heat distribution and preventing thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal interface material layer is applied to semiconductor die, then heat transfer from semiconductor device is improved, but non-uniformity in thermal distribution occurs leading to thermal damage
Solution Approach 1:
The patent segments the thermal monitoring function by placing multiple thermal diodes at different locations on the semiconductor die. This segmentation allows independent measurement of temperature at each location, enabling detection of non-uniform thermal distribution and identification of hot spots that could lead to thermal damage.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature differentials between multiple thermal diodes and using this information to assess thermal interface material uniformity. The system provides feedback on thermal conditions that enables corrective action before thermal damage occurs, improving reliability while maintaining effective heat transfer.
2Measurement precision
If multiple thermal diodes are used to measure temperature differentials, then detection precision of thermal irregularities is improved, but device complexity increases
Solution Approach 1:
The patent merges the thermal monitoring function with the existing semiconductor die structure by integrating thermal diodes directly into the die. This combining approach enables precise temperature differential measurement across multiple locations without adding separate external monitoring systems, thereby improving measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The thermal diodes serve multiple functions: they act as both temperature sensors for detecting thermal irregularities and as part of the overall thermal management system. This multi-functionality allows precise temperature differential detection while avoiding the need for additional dedicated components, thus reducing the impact on device complexity.
3Temperature
If thermal interface material uniformity is strictly controlled, then thermal distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent enables self-service thermal monitoring where the semiconductor device itself, through its integrated thermal diodes, measures and reports on its own thermal conditions. This self-monitoring capability allows detection of thermal interface material uniformity issues without requiring external inspection equipment or extremely tight manufacturing controls, thereby improving thermal distribution uniformity detection while reducing manufacturing precision requirements.
Solution Approach 2:
The patent changes the approach from controlling thermal interface material uniformity during manufacturing to monitoring temperature differentials as a measurable parameter after assembly. By shifting from material property control to operational parameter monitoring, the system achieves improved thermal distribution uniformity detection without imposing stringent manufacturing precision requirements on the thermal interface material application process.
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 enhances the reliability and yield of semiconductor devices by accurately detecting and addressing non-uniformities in the thermal interface material layer, preventing thermal breakdown and ensuring optimal operating temperatures.
Implementation Method 1
a thermal interface material layer directly on the semiconductor die and between the semiconductor die and the mounting substrate
Data Source
AI summary
An electronic system for evaluating temperature differences between different pairs of thermal diodes to evaluate the quality of a thermal interface material layer used for cooling the electronic system. Formation of a thermal diode array on a semiconductor die allows the measurement of temperature and temperature differences between a plurality of the thermal diode pairs arranged in an orthogonal configuration. The temperature differences between the thermal diode pairs can indicate the presence of irregular distribution of the thermal interface material. Such components with thermal interface material flaws can be rejected during manufacture to improve manufacturing quality.