High-Conductivity Transistor Spacers for Junction Heat Dissipation
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Solution Overview
Problem
The challenge of effectively reducing junction temperatures and improving thermal dissipation in semiconductor circuits, particularly in transistors, is exacerbated by the use of conventional materials with low thermal conductivity, leading to increased power consumption and reduced performance as device dimensions shrink.
Innovation Solution
Incorporation of spacers and isolation regions with higher thermal conductivity materials such as silicon carbide (SiC), hexagonal boron nitride (h-BN), and aluminum nitride (AlN) in the semiconductor circuit structure, along with heat removing layers, to enhance heat dissipation and reduce junction temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional materials with low thermal conductivity are used in transistor structures, then manufacturing simplicity is maintained, but junction temperature increases significantly
Solution Approach 1:
The patent applies local quality by selectively placing high thermal conductivity materials (such as aluminum nitride, silicon carbide, or diamond) only in specific regions where heat dissipation is most critical - namely in the spacer regions adjacent to the channel and in the isolation regions surrounding the transistor. This localized application of high-performance materials provides targeted thermal management without requiring the entire device structure to be complex or expensive.
Solution Approach 2:
The patent employs composite materials by combining conventional semiconductor materials with high thermal conductivity materials in a multi-layered structure. The spacers and isolation regions are formed as composites of dielectric materials with enhanced thermal properties, creating a hybrid structure that leverages both the electrical insulation properties of dielectrics and the thermal conduction properties of materials like aluminum nitride or silicon carbide.
2Productivity
If device dimensions are shrunk to satisfy Moore's Law, then integration density increases, but thermal dissipation capability deteriorates
Solution Approach 1:
The patent addresses thermal dissipation in scaled devices by introducing vertical dimensionality through multi-layered spacer and isolation region structures. Instead of relying solely on planar heat spreading, the invention creates three-dimensional thermal management pathways using stacked dielectric layers with varying thermal conductivities, allowing heat to dissipate through multiple dimensions and reducing the thermal burden on any single layer.
Solution Approach 2:
The high thermal conductivity spacers and isolation regions act as thermal intermediaries or heat sinks that facilitate heat transfer from the hot channel region to cooler surrounding areas. These intermediary structures provide dedicated thermal conduction pathways that bridge the temperature gradient, enabling efficient heat removal from the scaled transistor without requiring larger device dimensions.
3Speed
If higher power is applied to accelerate transistor performance, then speed improves, but junction temperature increases and creates negative cyclic effect
Solution Approach 1:
The patent converts the harmful heat generated by high-power operation into a manageable thermal flow by introducing high thermal conductivity materials that actively conduct heat away from the channel. The spacers and isolation regions, which would normally be passive dielectric structures, are transformed into active thermal management components that harness the heat flow and redirect it toward heat sinks, turning the harmful thermal effect into a controlled heat dissipation mechanism.
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 use of these high thermal conductivity materials significantly reduces junction temperatures by 24-59°C, improving transistor performance and addressing the heat dissipation issues in semiconductor circuits.
Implementation Method 1
a first spacer neighboring to a first sidewall of the gate structure, and a second spacer neighboring to a second sidewall of the gate structure. Wherein a thermal conductivity of the first spacer or the second spacer is higher than the thermal conductivity of silicon nitride (Si3N4)
Implementation Method 2
Incorporation of spacers and isolation regions with higher thermal conductivity materials such as silicon carbide (SiC), hexagonal boron nitride (h-BN), and aluminum nitride (AlN) in the semiconductor circuit structure, along with heat removing layers, to enhance heat dissipation and reduce junction temperatures
Data Source
AI summary
A semiconductor circuit structure includes a semiconductor substrate with an original semiconductor surface, an active region within the semiconductor substrate, and a transistor formed based on the active region. The transistor includes a gate structure, a first spacer neighboring to a first sidewall of the gate structure, and a second spacer neighboring to a second sidewall of the gate structure. Wherein a thermal conductivity of the first spacer or the second spacer includes is higher than the thermal conductivity of silicon nitride (Si3N4).