Multi-Layer UV Photo Detection Device with Segmented Light Absorption
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Solution Overview
Problem
Conventional Schottky junction type UV detection devices require multiple devices to detect different wavelength regions, leading to inaccurate reactivity values due to varying reverse bias effects and lack of reliability in detecting UV light, especially with UV-B region light, which is crucial for skin protection and environmental monitoring.
Innovation Solution
A photo detection device with multiple light absorption layers having different energy bandgaps, each with its own electrode layer, allowing individual operation and accurate reactivity value measurement across various wavelength regions, integrated into a single device and package for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate devices are used to detect different wavelength regions, then each device can be optimized for its specific wavelength, but the overall system complexity increases and reliability decreases
Solution Approach 1:
The patent combines multiple light absorption layers with different energy bandgaps into a single photo detection device. Each layer detects a specific wavelength region (UV-A, UV-B, UV-C) while being integrated in one structure, thereby reducing the total number of devices while maintaining detection accuracy for each wavelength region.
Solution Approach 2:
The photo detection device achieves multi-functionality by incorporating multiple light absorption layers that can detect different wavelength regions simultaneously. This universal design allows a single device to perform the functions of multiple separate devices, detecting UV-A, UV-B, and UV-C regions without requiring separate specialized devices for each wavelength.
2Device complexity
If a single light absorption layer is used to detect multiple wavelength regions, then device complexity is reduced, but measurement precision and reliability deteriorate due to varying reverse bias effects
Solution Approach 1:
The patent segments the light absorption function into multiple distinct layers, each optimized for a specific wavelength region with appropriate energy bandgap. This segmentation allows each layer to maintain consistent and accurate reactivity values for its designated wavelength, avoiding the measurement precision problems that would arise from using a single layer to detect multiple wavelengths.
Solution Approach 2:
Each light absorption layer is designed with specific local properties (energy bandgap, thickness, material composition) tailored to its intended wavelength detection function. This local quality optimization ensures that each layer delivers accurate and reliable measurements for its specific wavelength region, while the overall device maintains structural simplicity through integration.
3Ease of manufacture
If conventional Schottky junction type devices are used, then fabrication process is simple, but the ability to detect multiple wavelength regions accurately is lost
Solution Approach 1:
The patent employs composite material structure by stacking multiple light absorption layers made of different materials with specific energy bandgaps (e.g., GaN, AlGaN, InGaN) on a heterogeneous substrate. This composite approach maintains the simplicity of the Schottky junction fabrication process while significantly enhancing the device's adaptability to detect multiple wavelength regions accurately.
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
Enables accurate detection of multiple UV wavelength regions with improved reliability by ensuring consistent reactivity values across different wavelengths, enhancing product reliability and operational consistency.
Implementation Method 1
a photo detection device includes a substrate, a first light absorption layer disposed on the substrate, a second light absorption layer disposed in a first region on the first light absorption layer, and a first electrode layer disposed on each of the first and the second light absorption layers
Data Source
AI summary
Exemplary embodiments of the present invention relate to a photo detection device including a substrate, a first light absorption layer disposed on the substrate, a second light absorption layer disposed in a first region on the first light absorption layer, a third light absorption layer disposed in a second region on the second light absorption layer, and a first electrode layer disposed on each of the first, the second, and the third light absorption layers.