Micro-Transfer Printed Compound Sensor Integration
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Solution Overview
Problem
Conventional sensor systems face inefficiencies in integration and size due to the need for separate processing and mounting of sensors and processing circuitry on different materials, leading to increased size and noise in electronic control devices.
Innovation Solution
A compound sensor device is created by micro-transfer printing a sensor substrate onto a semiconductor substrate, using different materials and technologies for each, which reduces noise and increases integration by directly connecting the sensor and electronic circuitry, allowing for a single package solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are constructed in materials different from processing circuitry (e.g., compound semiconductor vs. silicon), then sensor performance is improved, but integration complexity and device size increase due to separate mounting and electrical connection requirements
Solution Approach 1:
The patent merges sensors and processing circuitry into a single integrated circuit by fabricating both on the same silicon substrate. The sensor elements (e.g., photodetectors, LEDs) and processing circuitry are co-fabricated using compatible semiconductor processes, eliminating the need for separate mounting and wire bonding. This combining approach maintains sensor performance while reducing integration complexity.
Solution Approach 2:
The patent creates a universal silicon-based platform that can accommodate multiple sensor types (photodetectors, LEDs, other sensors) and processing circuitry. By designing the sensor elements to be compatible with standard silicon fabrication processes, the system achieves multi-functionality without requiring different material systems, thereby simplifying integration.
2Adaptability or versatility
If sensors are mounted separately on a substrate and electrically connected via bonding wires, then material compatibility is maintained, but the physical size of the sensor package increases
Solution Approach 1:
The patent combines sensor elements and processing circuitry on the same substrate, eliminating the need for separate sensor mounting and wire bonding. This integration dramatically reduces the overall package area while maintaining electrical connectivity through direct on-substrate connections rather than external bonding wires.
Solution Approach 2:
The patent transitions from a three-dimensional assembly (separate sensor chip mounted on substrate with wire bonds) to a planar two-dimensional integration approach where all elements are fabricated on the same surface. This dimensional change enables compact packaging while maintaining all necessary electrical connections.
3Area of stationary object
If sensors and processing circuitry are integrated on the same substrate, then device size is reduced, but process compatibility constraints limit material choices for sensors
Solution Approach 1:
The patent changes the material parameter from compound semiconductors (GaAs, InP) to silicon, enabling integration with standard CMOS processing. By adjusting the material selection to match the substrate material, the patent achieves compact integration while maintaining sensor functionality through silicon-compatible fabrication processes.
Solution Approach 2:
The patent uses homogeneous silicon material for both the substrate and sensor elements, eliminating material interface issues that arise from heteroepitaxial growth. This homogeneity enables standard silicon fabrication processes to be used for both the substrate and sensor layers, providing process compatibility while achieving small device size.
4Reliability
If electrical connections between separate sensor and processing substrates are made, then functionality is achieved, but connection length increases leading to higher noise and reduced high-frequency performance
Solution Approach 1:
The patent merges sensor elements and processing circuitry on the same substrate, eliminating long external electrical connections. All electrical interconnections are made through short on-substrate traces rather than long wire bonds or PCB traces, dramatically reducing inductance, capacitance, and noise while improving high-frequency performance.
Data Source
AI summary
A compound sensor device includes a semiconductor substrate having an active electronic circuit formed in or on the semiconductor substrate. A sensor including a sensor substrate including a sensor circuit having an environmental sensor or actuator formed in or on the sensor substrate is micro-transfer printed onto the semiconductor substrate. One or more electrical conductors electrically connect the active electronic circuit to the sensor circuit. The semiconductor substrate includes a first material and the sensor substrate includes a second material different from the first material.