Flexible Transistor TSV Layout for Near-Junction Heat Dissipation
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Solution Overview
Problem
Flexible microwave electronics face limitations in high-power applications due to poor heat dissipation on low thermal conductivity substrates, leading to degraded performance and reliability, despite efforts to enhance thermal conductivity and manage heat effectively.
Innovation Solution
The implementation of thru-substrate vias (TSVs) coated with thermally conductive materials in flexible transistors and circuits, which provide efficient heat dissipation from active regions while maintaining mechanical flexibility and high-frequency performance, utilizing materials like copper to transfer heat to a large-area ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high thermal conductivity fillers are added to flexible polymer substrates, then thermal conductivity is improved, but manufacturing complexity increases and anisotropic thermal properties are introduced
Solution Approach 1:
The patent introduces a thermally conductive adhesive layer as an intermediary between the flexible substrate and the transistor device. This adhesive layer serves as a thermal mediator that conducts heat away from the device without requiring complex filler distributions in the substrate itself, thereby improving thermal management while maintaining substrate simplicity
Solution Approach 2:
The patent employs composite material structures by combining the flexible polymer substrate with a thermally conductive adhesive layer containing high thermal conductivity fillers. This composite approach allows the substrate to remain simple and flexible while the adhesive layer provides enhanced thermal conduction pathways
2Ease of manufacture
If low thermal conductivity adhesive layers are used to bond transistors on flexible substrates, then ease of bonding is improved, but thermal resistance increases significantly
Solution Approach 1:
The patent changes the thermal parameter of the adhesive layer by selecting or formulating a thermally conductive adhesive with high thermal conductivity. This parameter change allows the adhesive to maintain its bonding function while simultaneously serving as an effective thermal conduction pathway, resolving the contradiction between bonding ease and thermal resistance
3Temperature
If large-area membrane semiconductor is used to spread heat, then thermal management is improved, but manufacturing cost increases and yield decreases
Solution Approach 1:
The patent extracts the heat spreading function from the semiconductor membrane itself and relocates it to a dedicated thermally conductive adhesive layer and substrate structure. This separation allows the semiconductor membrane to remain small and efficiently manufactured while the thermal management function is handled by the adhesive and substrate, improving both yield and cost-effectiveness
4Adaptability or versatility
If flexible substrates with low thermal conductivity are used, then mechanical flexibility is maintained, but heat dissipation capability deteriorates
Solution Approach 1:
The patent segments the thermal management function from the mechanical support function by introducing a dedicated thermally conductive adhesive layer. The flexible substrate maintains its mechanical flexibility while the adhesive layer provides specialized thermal conduction pathways, allowing each component to optimize its primary function without compromise
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 results in lower thermal resistance and higher DC current, suppressed self-heating, and improved high-frequency performance, enabling flexible microwave transistors to operate reliably at high power levels without overheating.
Implementation Method 1
A thermally conductive film in contact with the lower surface of the dielectric polymer substrate, the sidewalls of the via, and the surface of the semiconductor structure that is exposed through the via provides heat dissipation
Data Source
AI summary
Flexible transistors and electronic circuits incorporating the transistors are provided. The flexible transistors promote heat dissipation from the active regions of the transistors while preserving their mechanical flexibility and high-frequency performance. The transistor designs utilize thru-substrate vias (TSVs) beneath the active regions of thin-film type transistors on thin flexible substrates. To promote rapid heat dissipation, the TSVs are coated with a material having a high thermal conductivity that transfers heat from the active region of the transistor to a large-area ground.