Composite Shallow Trench Isolation for Lower Transistor Junction Heat
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing power consumption of densely integrated transistors in semiconductor devices leads to elevated junction and chip temperatures, which are not effectively managed by current heat-dissipation methods, hindering further integration and performance improvements.
Innovation Solution
A semiconductor circuit structure is developed with a composite shallow trench isolation region filled with a high thermal conductivity material, such as silicon, to enhance heat dissipation by replacing portions of the conventional silicon oxide isolation with materials like silicon, silicon carbide, or boron nitride, integrated within standard processing flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional silicon oxide shallow trench isolation is used, then electrical isolation is achieved, but heat dissipation capability is insufficient
Solution Approach 1:
The patent applies local quality by creating a composite STI structure where different materials serve different functions: silicon oxide provides electrical isolation while silicon or silicon carbide regions provide enhanced heat dissipation. This localized material differentiation allows simultaneous achievement of electrical isolation and improved thermal management without compromising either function.
Solution Approach 2:
The patent implements composite materials by combining silicon oxide with high thermal conductivity materials (silicon or silicon carbide) in a layered composite STI structure. This composite approach leverages the electrical isolation properties of silicon oxide while utilizing the superior heat dissipation capabilities of silicon/silicon carbide, directly resolving the thermal management limitation of conventional homogeneous STI.
2Productivity
If transistor integration density is increased, then device performance is improved, but power consumption and heat generation increase
Solution Approach 1:
The patent extracts the heat dissipation function from the conventional electrical isolation structure by introducing separate high thermal conductivity material regions within the STI. This extraction allows the STI structure to simultaneously perform electrical isolation and active heat removal, enabling higher integration densities without proportional increases in junction temperature and power consumption.
3Temperature
If external heat removal methods are used, then heat dissipation is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent implements self-service by integrating heat dissipation functionality directly into the STI structure that already exists on the chip. The high thermal conductivity materials are incorporated during standard semiconductor fabrication processes, allowing the device to self-manage heat without requiring external cooling systems or additional packaging complexity, thereby avoiding significant manufacturing cost increases.
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 structure effectively reduces transistor junction temperatures, improving thermal dissipation efficiency without significant additional cost, enabling further integration and performance enhancements.
Implementation Method 1
the shallow trench is filled with a thermal conductivity semiconductor material... effectively reduces transistor junction temperatures, improving thermal dissipation efficiency
Implementation Method 2
the thermal conductivity semiconductor material is isolated from the semiconductor substrate by the dielectric layer
Implementation Method 3
laser annealing or thermal annealing against the amorphous semiconductor material to form the thermal conductivity semiconductor material
Implementation Method 4
laser annealing or thermal annealing against the amorphous semiconductor material to form the thermal conductivity semiconductor material
Data Source
AI summary
A method for fabricating a semiconductor circuit structure includes steps as follows: A semiconductor substrate is provided. A shallow trench is formed extending into the semiconductor substrate from an original surface of the semiconductor substrate to surround an active region. A dielectric layer is formed on sidewalls and a bottom of the shallow trench. The shallow trench is filled with a thermal conductivity semiconductor material, wherein the thermal conductivity semiconductor material is isolated from the semiconductor substrate by the dielectric layer.