Microwave LED Detection Without Probes for Faster Wafer Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Contact-based detection methods for LEDs face challenges such as probe blunting, potential damage to LEDs, and time-consuming probe movement, leading to reduced detection reliability and increased costs.
Innovation Solution
A non-contact detection method using microwaves to induce light emission in semiconductor devices, eliminating the need for physical probes and enabling simultaneous testing of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact-based probe detection method is used, then detection can be performed, but probe blunting occurs leading to reduced detection reliability
Solution Approach 1:
The patent replaces the mechanical contact-based probe detection system with a non-contact microwave-based detection system. The microwave device applies microwave energy to the LED through air gap, eliminating mechanical contact entirely. This substitution resolves the probe blunting issue by removing the mechanical interaction that causes probe tip wear and blunting, thereby maintaining detection reliability over extended periods.
Solution Approach 2:
The patent introduces microwave energy as an intermediary to transfer detection signals to the LED without direct contact. Instead of using physical probes that touch the LED electrodes, the system uses microwave coupling through air as a mediator to induce current in the LED, which then emits light for detection. This intermediary approach eliminates the need for physical probe contact and prevents probe blunting.
2Ease of operation
If probe with larger tip area is used, then easier contact is achieved, but LED may be damaged and detection reliability decreases
Solution Approach 1:
The patent eliminates the mechanical probe contact system entirely and replaces it with non-contact microwave coupling. This substitution removes the source of damage risk associated with probe tip area, as there is no physical contact between any component and the LED. The microwave energy couples through air to induce current in the LED without mechanical contact, thereby eliminating damage risk while maintaining ease of operation.
3Adaptability or versatility
If probe movement and repositioning is performed for different chips, then different LEDs can be measured, but detection time increases
Solution Approach 1:
The patent designs a universal non-contact detection system that can measure multiple LEDs on a wafer simultaneously through parallel microwave coupling. The microwave device and light collecting device are configured to handle multiple chips at once, eliminating the need for sequential probe movement and repositioning. This multi-functionality approach maintains adaptability for measuring different LEDs while dramatically increasing detection speed by parallel processing.
Solution Approach 2:
The patent replaces the mechanical probe movement system with a stationary non-contact microwave detection system. Instead of physically moving probes between different chip positions, the system uses microwave coupling that can simultaneously target multiple LEDs at fixed positions. This substitution eliminates mechanical movement time while maintaining the ability to measure different chips, thereby increasing productivity.
4Productivity
If frequent probe replacement is performed, then detection continues, but cost increases
Solution Approach 1:
The patent replaces the consumable mechanical probes with a non-contact microwave detection system that does not require physical contact with the LED. This substitution eliminates the need for probe replacement entirely, as there are no mechanical probes that can blunt or wear out. Detection continuity is maintained through the durable microwave and light collecting components, while probe replacement costs are completely eliminated.
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
Enhances detection reliability, stability, and accuracy while preventing device damage, and significantly increasing detection speed.
Implementation Method 1
applying a microwave to the first electrode to cause the semiconductor device to emit light
Implementation Method 2
The electroluminescence (EL) detection method currently in use involves using a probe directly contacting electrodes of LED during measurement
Implementation Method 3
detecting the light emitted from the semiconductor device
Data Source
AI summary
A method for non-contact detection. The method includes providing a semiconductor device. The semiconductor device has an epitaxial stack, a first electrode and a second electrode connected to the epitaxial stack. The method further includes applying a microwave to the first electrode to cause the semiconductor device to emit light and detecting the light emitted from the semiconductor device.