Variable Thermal Resistance for Semiconductor Screening Accuracy
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Solution Overview
Problem
Existing energization inspection apparatuses for semiconductor devices with silicon carbide substrates face challenges in efficiently screening devices due to fixed thermal resistance values, leading to increased screening time and variability in accuracy with changing product specifications, which affects the reliability of the sorting process.
Innovation Solution
An energization inspection apparatus with a variable thermal resistance mechanism allows for precise control of junction temperature, enabling faster screening and maintaining consistent accuracy by adjusting thermal resistance values to match changing product specifications, and includes multiple electrodes for comprehensive voltage and current measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed thermal resistance value is used in the insulating plate, then the structure is simple, but the screening time increases and sorting accuracy cannot be maintained constant
Solution Approach 1:
The insulating plate incorporates a variable thermal resistance mechanism that can dynamically adjust its thermal resistance value based on operational requirements. This allows the system to optimize heat dissipation during different stages of the screening process, enabling faster identification of conforming products while maintaining sorting accuracy, thereby resolving the contradiction between screening time and structural complexity
Solution Approach 2:
The thermal resistance parameter of the insulating plate is made variable rather than fixed. By changing the thermal resistance value according to the specific screening conditions and product specifications, the system can adapt to different scenarios and maintain optimal screening performance without requiring complex structural modifications, thus improving productivity while controlling device complexity
2Productivity
If maximum rated forward current is applied to reach maximum rated junction temperature, then stacking fault growth is accelerated, but thermal management becomes more challenging
Solution Approach 1:
The variable thermal resistance mechanism dynamically adjusts heat dissipation rates to match the applied forward current levels. When maximum rated forward current is applied to accelerate stacking fault growth, the thermal resistance is adjusted to maintain junction temperature within safe operating limits, enabling high-speed screening without compromising thermal management
Solution Approach 2:
The system incorporates thermal feedback control where the thermal resistance of the insulating plate is adjusted based on real-time temperature monitoring. This ensures that when high forward current is applied to accelerate the screening process, the junction temperature is kept under control, resolving the contradiction between screening speed and temperature management
3Measurement precision
If fixed thermal resistance is used, then device structure is simple, but sorting accuracy varies with product specifications
Solution Approach 1:
The thermal resistance parameter is made adjustable to match different product specifications such as maximum rating and substrate thickness. This allows the system to maintain consistent sorting accuracy across various semiconductor device types without requiring a completely different thermal management structure for each product variant, thus improving measurement precision while controlling device complexity
Solution Approach 2:
The variable thermal resistance mechanism provides universal applicability across different product specifications. A single insulating plate with adjustable thermal resistance can serve multiple product types (different maximum ratings and substrate thicknesses), eliminating the need for separate thermal management systems for each product variant and maintaining high sorting accuracy universally
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 reduces the time required to screen semiconductor devices and ensures consistent accuracy regardless of product specifications, resulting in a highly reliable semiconductor device sorting process.
Implementation Method 1
the insulating plate has a variable thermal resistance mechanism
Implementation Method 2
a cooling plate, an insulating plate provided on the cooling plate
Implementation Method 3
when a current flows through the built-in diode, recombination of electrons and holes occurs inside the n-type SiC substrate
Data Source
AI summary
An electric connection inspection device includes: a cooling plate; an insulating plate provided on the cooling plate; a first measurement electrode provided on the insulating plate; and a second measurement electrode and a third measurement electrode provided above the first measurement electrode and located apart from the first measurement electrode. The insulating plate includes a variable thermal resistance mechanism. A semiconductor device can be installed between the first measurement electrode and the second measurement electrode and between the first measurement electrode and the third measurement electrode.