Metal Gate Self-Heating for In-Line Semiconductor Reliability Testing
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Solution Overview
Problem
Current semiconductor processes are time-consuming and prone to wafer damage due to the inefficiency of external heaters for reliability testing, as they require lengthy heating times and poor heat conduction, and involve moving the wafer for heating.
Innovation Solution
A semiconductor structure utilizing a metal gate structure as a heater, where the metal gate is disposed on a substrate, electrically separated from the device to be tested, and generates heat when a voltage is applied, allowing for in-line monitoring and reducing the risk of wafer damage by heating the device directly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an external heater is used to heat the wafer for reliability testing, then the device temperature can be increased to suitable levels, but the heating time becomes too long and heat conduction efficiency is poor
Solution Approach 1:
The patent merges the heater function with the existing metal gate structure of the device. Instead of using a separate external heater, the metal gate is repurposed to generate heat directly at the device location through applied voltage, eliminating the time delay associated with external heating and improving heat conduction efficiency by heating at the source.
Solution Approach 2:
The metal gate structure serves as an intermediary element that converts electrical energy to thermal energy directly at the device. By applying voltage to the metal gate, it generates heat that directly heats the device, acting as a localized heating mediator that eliminates the inefficiencies of external heating methods.
2Temperature
If the wafer is placed on an external heater for heating, then the device can be heated to test temperature, but the probability of damage to the wafer during moving increases
Solution Approach 1:
The device heats itself through its own metal gate structure when voltage is applied. This self-heating capability eliminates the need to move the wafer to or from an external heater, thereby preventing mechanical damage that could occur during handling and transport while maintaining the ability to achieve test temperatures.
3Temperature
If an external heater is used for reliability testing, then heating can be achieved, but the process becomes time-consuming and inefficient
Solution Approach 1:
The heating function is merged into the device structure itself through the metal gate. This integration allows for rapid heating directly at the device location, eliminating the time-consuming transfer and heating process associated with external heaters, thereby significantly improving reliability evaluation efficiency.
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 significantly reduces the time required for reliability evaluation by rapidly heating the device to 200° C. to 400° C., avoiding the need for external heaters and minimizing wafer damage during handling.
Implementation Method 1
The device to be tested is heated by a heat generated when the metal gate structure is applied with a voltage
Data Source
AI summary
A semiconductor structure is provided. The semiconductor structure includes at least one metal gate structure and a device to be tested. The metal gate structure is disposed on a substrate. The device to be tested is disposed on the metal gate structure and electrically separated from the metal gate structure. The device to be tested is heated by a heat generated when the metal gate structure is applied with a voltage.