Vertical Capacitor Environmental Sensor for Miniaturization
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Solution Overview
Problem
Conventional environmental sensors occupy significant chip area on electronic devices due to their surface-mounted capacitance structures, hindering miniaturization efforts in modern portable electronics.
Innovation Solution
A novel environmental sensor design featuring a base material with grooves, where a sensitive film layer forms a vertical capacitor structure with the groove walls, allowing for increased sensing area while reducing surface coverage, achieved through etching and sacrificial layer deposition processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a parallel capacitance structure is used for environmental sensing, then the sensor can detect environmental changes, but the sensor occupies a larger chip area
Solution Approach 1:
The patent transitions from a planar parallel capacitance structure to a three-dimensional vertical capacitance structure by etching grooves into the substrate. The sensitive film layer is positioned vertically within these grooves, creating a capacitor where one electrode is the film layer and the other is the groove wall. This vertical arrangement increases the sensing area without expanding the chip footprint, directly resolving the contradiction between detection capability and area occupation.
Solution Approach 2:
The sensitive film layer is nested within the grooves etched into the substrate, with the film layer occupying the interior space of the groove structure. This nesting approach allows the capacitor structure to be embedded within the substrate volume rather than occupying surface area, enabling the sensor to maintain environmental detection functionality while minimizing chip area occupation.
2Area of stationary object
If the sensor size is reduced to meet portable electronics requirements, then the sensor can be integrated into smaller devices, but the sensing area and detection precision may be compromised
Solution Approach 1:
The patent resolves this contradiction by moving the sensing area from the two-dimensional plane to the third dimension. The vertical grooves provide additional sensing area within the same chip footprint, allowing the sensor to be smaller while maintaining or even enhancing detection precision through increased effective sensing area.
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 vertical capacitor structure enhances sensitivity and precision, reducing the sensor's coverage area by up to 1/10 of traditional designs, aligning with the trend of lighter and thinner electronic devices.
Implementation Method 1
The bending part and the side wall of the groove form a capacitor configured for signal detection
Data Source
AI summary
An environmental sensor and manufacturing method thereof. The environmental sensor comprises: a substrate comprising at least one recess disposed at an upper portion of the substrate; and a sensitive film layer disposed above the substrate, comprising a fixed portion fixed on an end surface of the substrate and a bent portion configured to extend inside the recess. The bent portion and a side wall of the recess form a capacitor configured to detect a signal. The bent portion, fixed portion, and the recess form a closed cavity. A conventional capacitive structure configured on a substrate surface is changed to a capacitive structure of the environmental sensor vertically extending into the inside of the substrate, increasing a depth of the recess, and in turn, increasing a sensing area between two polar plates of the capacitor, significantly shrinking a coverage area of the capacitor on the substrate, and satisfying a requirement of a modern compact electronic component.