SOI Backside Thermal Dissipation Layer for Heat Management
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Solution Overview
Problem
Semiconductor-on-insulator (SOI) devices face significant challenges in heat dissipation due to the low thermal conductivity of the insulating layer, which can lead to critical failures such as warping or melting of circuitry materials, despite improvements in electrical characteristics.
Innovation Solution
The introduction of a thermal dissipation layer with high thermal conductivity, which is electrically insulating, is deposited on the back side of the SOI structure, either entirely or in excavated regions of the insulator layer, allowing for efficient heat dissipation while preserving the electrical characteristics of the active devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulator layer is introduced to isolate the active layer from bulk substrate, then electrical characteristics are improved, but heat dissipation performance deteriorates
Solution Approach 1:
The patent segments the insulator layer into two functional regions: a first insulator region that maintains electrical isolation properties, and a second insulator region with enhanced thermal conductivity for heat dissipation. This segmentation allows the same layer to simultaneously address both electrical performance and thermal management requirements.
Solution Approach 2:
The patent applies local quality by creating regions with different thermal conductivities within the insulator layer. The second insulator region is specifically engineered with higher thermal conductivity to handle heat dissipation in critical areas, while the first insulator region maintains optimal electrical isolation properties, allowing each region to be optimized for its specific function.
2Temperature
If the insulator layer thickness is reduced to improve heat dissipation, then thermal conductivity improves, but electrical isolation performance deteriorates
Solution Approach 1:
The insulator layer is divided into multiple regions with different thicknesses and material compositions. The first insulator region maintains sufficient thickness for electrical isolation, while the second insulator region is optimized for thermal conduction, eliminating the need to compromise electrical isolation for heat dissipation.
Solution Approach 2:
The patent employs composite material strategies by combining insulator materials with different thermal and electrical properties in specific regions. This allows the structure to achieve both excellent electrical isolation and superior heat dissipation without reducing the overall insulator thickness.
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 solution significantly enhances heat dissipation performance by over 100-fold compared to traditional SOI structures, reducing the risk of thermal failures while maintaining the electrical benefits of SOI technology.
Implementation Method 1
The thermal dissipation layer has high thermal conductivity and is electrically insulating
Data Source
AI summary
Embodiments of the present invention provide for the application of strain inducing layers to enhance the mobility of transistors formed on semiconductor-on-insulator (SOI) structures. In one embodiment, a method for fabricating an integrated circuit is disclosed. In a first step, active circuitry is formed in an active layer of a SOI wafer. In a second step, substrate material is removed from a substrate layer disposed on a back side of the SOI wafer. In a third step, insulator material is removed from the back side of the SOI wafer to form an excavated insulator region. In a fourth step, a strain inducing material is deposited on the excavated insulator region. The strain inducing material interacts with the pattern of excavated insulator such that a single layer provides both tensile and compressive stress to p-channel and n-channel transistors, respectively. In alternative embodiments, the entire substrate is removed before forming the strain inducing material.