Deep Trench Capacitor Fuse Structure for High-Voltage Breakdown Defense
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Deep trench capacitors (DTCs) in semiconductor chips are prone to structural damage due to high voltage breakdown events, especially with increasingly thinner layers, leading to incorrect capacitance values and logic device failures.
Innovation Solution
Integrate a transistor device, such as a bipolar junction transistor (BJT) or MOSFET, connected to DTC layers to dissipate excess voltage during high voltage events, with the BJT's breakdown voltage designed lower than the node dielectric layers, allowing it to activate and relay current to equalize voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If DTC layers are made thinner to reduce device footprint, then capacitance density is improved, but vulnerability to high voltage breakdown increases
Solution Approach 1:
A transistor device is introduced as an intermediary protective element between the DTC layers and high voltage threats. The transistor's breakdown voltage is deliberately designed to be lower than that of the DTC node dielectric layers, causing it to fail first and protect the capacitor structure from catastrophic damage.
Solution Approach 2:
The transistor device is pre-configured with a lower breakdown voltage threshold than the DTC layers, creating a sacrificial protection mechanism. During high voltage events, the transistor activates beforehand to dissipate excess voltage through controlled breakdown, cushioning the DTC structure from direct exposure to damaging voltage spikes.
2Reliability
If transistor breakdown voltage is set lower than DTC node dielectric layers, then protection capability is improved, but risk of transistor activation during normal operation increases
Solution Approach 1:
The transistor's breakdown voltage parameter is precisely engineered to fall within a specific range: lower than the DTC node dielectric breakdown voltage but higher than the normal operating voltage of the capacitor. This parameter optimization ensures the transistor remains inactive during normal operation while providing protection during high voltage events.
Solution Approach 2:
The protective transistor is strategically positioned and configured with specific electrical characteristics tailored for voltage protection. Its breakdown voltage is locally optimized to be different from both the DTC operating voltage and the DTC dielectric breakdown voltage, creating a selective protection zone that activates only when needed.
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 integrated transistor structure prevents structural damage to DTCs by dissipating excess voltage, maintaining normal operation after high voltage breakdown events.
Implementation Method 1
the BJT's breakdown voltage designed lower than the node dielectric layers, allowing it to activate and relay current to equalize voltage
Data Source
AI summary
Devices and methods for manufacturing a deep trench capacitor fuse for high voltage breakdown defense. A semiconductor device comprising a deep trench capacitor structure and a transistor structure. The transistor structure may comprise a base, a first terminal formed within the base, and a second terminal formed within the base. The first terminal and the second terminal may be formed by doping the base. The deep trench capacitor structure may comprise a first metallic electrode layer and a second metallic electrode layer. The first terminal may be electrically connected to the first metallic electrode layer, and the second terminal may be electrically connected to the second metallic electrode layer.