Semiconductor Die Warpage Inspection with Thermal Isolation Cover
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Solution Overview
Problem
The challenge in semiconductor manufacturing is accurately inspecting the warpage of semiconductor dies during packaging processes, which is crucial for ensuring proper integration and functionality, while minimizing disturbances from ambient air heating that can affect optical data acquisition.
Innovation Solution
An inspection apparatus with a thermal isolation material between the heater and carrier, and a transparent cover above the die, reduces ambient air heating, allowing precise optical inspection of semiconductor warpage with less than 1.5 μm variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is used to heat the semiconductor die during inspection, then the warpage inspection can be performed under thermal conditions, but ambient air heating causes disturbances that affect optical data acquisition precision
Solution Approach 1:
A cover is introduced as an intermediary element between the heater and the ambient air. The cover confines the heated air within a specific region above the semiconductor die, preventing the heat from mixing with and disturbing the larger volume of ambient air. This mediator structure allows thermal inspection conditions while maintaining optical measurement precision by isolating the thermal field from the optical measurement environment.
Solution Approach 2:
The heating effect is localized to a specific region directly above the semiconductor die using the cover structure. Instead of heating the entire ambient air volume, the thermal energy is concentrated in a confined space, creating a local thermal environment for inspection while leaving the surrounding ambient air undisturbed and suitable for optical data acquisition.
2Reliability
If the semiconductor die is heated for warpage inspection, then thermal warpage characteristics can be measured, but air disturbance increases reducing inspection accuracy
Solution Approach 1:
The cover serves as a mediator that separates the thermal inspection zone from the optical measurement zone. It allows the semiconductor die to be heated for reliable warpage measurement while preventing the resulting air currents from reaching and disturbing the optical sensors, thereby maintaining both thermal reliability and measurement precision.
Solution Approach 2:
The inspection system is segmented into distinct functional zones: a thermal heating zone confined by the cover where the semiconductor die is heated, and an optical measurement zone where sensors are positioned. This spatial segmentation allows independent optimization of thermal conditions for reliability while maintaining stable environmental conditions for measurement precision.
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 solution provides high-precision warpage inspection of semiconductor dies, ensuring they meet packaging criteria by minimizing air disturbance and enhancing optical data acquisition accuracy.
Implementation Method 1
a thermal isolation material between the heater and carrier
Data Source
AI summary
An inspection apparatus for a warpage of a semiconductor die includes a carrier, a thermal isolation material, a holding unit, a heater, a transparent cover, a light source, and a capture device. The thermal isolation material is disposed over the carrier. The holding unit stands on and is in contact with the thermal isolation material. The heater is disposed inside the holding unit and is configured to heat the semiconductor die. The transparent cover stands on and is in contact with the holding unit, where the semiconductor die is disposed between the transparent cover and the heater. The light source is disposed over the transparent cover and is configured to project a light having a pattern to the semiconductor die. The capture device is disposed over the transparent cover and is configurated to capture an image of the semiconductor die for inspecting the warpage of the semiconductor die after heating.