EWOD Device Thin High-K Dielectric Layer
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Solution Overview
Problem
Existing electro-wetting on dielectric (EWOD) devices require high voltages to alter the contact angle of droplets, leading to reduced operating life and increased surface resistance due to non-planar hydrophobic layers, which hinder efficient droplet manipulation.
Innovation Solution
A semiconductor arrangement with a planar hydrophobic layer and a thin, high dielectric constant driving dielectric layer is formed, allowing for lower voltage application and increased droplet flow rate by reducing surface resistance, thereby extending the operating life and improving droplet manipulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high voltage is applied to alter the contact angle of droplets, then droplet manipulation is achieved, but operating life is reduced and surface resistance increases
Solution Approach 1:
The patent changes the dielectric constant parameter of the driving dielectric layer by selecting materials with high dielectric constants (e.g., barium strontium titanate, lead zirconate titanate, hafnium oxide). This parameter change allows the system to achieve the same electro-wetting effect at lower voltages, thereby extending operating life while maintaining droplet manipulation capability
Solution Approach 2:
The patent employs composite material structures combining multiple dielectric layers with different properties. The driving dielectric layer with high dielectric constant is combined with other dielectric materials to create a composite structure that optimizes both the electro-wetting performance and operational reliability, enabling lower voltage operation
2Ease of operation
If non-planar hydrophobic layer is present, then droplet contact angle can be altered, but surface resistance increases
Solution Approach 1:
The patent applies local quality by creating a planar hydrophobic layer with uniform properties across the surface. This planar structure locally optimizes the surface characteristics to reduce surface resistance while maintaining the ability to alter contact angle through controlled electro-wetting, eliminating the harmful surface resistance effect associated with non-planar structures
3Power
If thin high dielectric constant driving dielectric layer is used, then lower voltage is required, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the dielectric constant parameter to very high values (e.g., barium strontium titanate with εr≈1000, lead zirconate titanate with εr≈300-1000, hafnium oxide with εr≈20-50). This extreme parameter change compensates for the thin layer thickness, allowing lower voltage operation while the high dielectric constant provides a margin of tolerance for manufacturing variations
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 solution enables EWOD devices to operate with lower voltages, increasing the flow rate of droplets and extending the operating life by reducing the voltage required to alter the contact angle, while maintaining a planar hydrophobic layer for reduced surface resistance.
Implementation Method 1
a driving dielectric layer over the first electrode, the second electrode and the first separating portion
Implementation Method 2
electro-wetting on dielectric (EWOD) device, wherein a shape of a droplet of electrically conductive liquid placed within the device is altered as a function of an electric potential applied across the device
Implementation Method 3
a first hydrophobic layer over the driving dielectric layer
Data Source
AI summary
A semiconductor arrangement and method of formation are provided. The semiconductor arrangement includes an electro-wetting-on-dielectric (EWOD) device. The EWOD device includes a top portion over a bottom portion and a channel gap between the top portion and the bottom portion. The bottom portion includes a driving dielectric layer over a first electrode, a second electrode and a first separating portion of an ILD layer between the first electrode and a second electrode. The driving dielectric layer has a first thickness less than about 1,000 Å. An EWOD device with a driving dielectric layer having a first thickness less 1000 Å requires a lower applied voltage to alter a shape of a droplet within the device and has a longer operating life than an EWOD device that requires a higher applied voltage to alter the shape of the droplet.