Optical Filtering Layer for Wavelength-Selective Semiconductor Detection
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Solution Overview
Problem
Conventional semiconductor photodetectors face issues with responsivity when exposed to natural light and moisture, as they are designed for specific wavelength ranges and produce high responsivity outside these ranges, leading to ineffective light detection.
Innovation Solution
A semiconductor device with a substrate, buffer layer, gradient layer, active layer, and optical filtering layer, where the optical filtering layer blocks specific wavelengths to prevent high responsivity in undesired ranges, allowing optimal light detection in the desired wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the semiconductor photodetector is designed for a specific wavelength range to achieve high responsivity, then light detection precision is improved, but the device produces high responsivity in other wavelength ranges when exposed to natural light, leading to ineffective detection
Solution Approach 1:
An optical filtering layer is introduced as an intermediary component between the light source and the photodetector. This filtering layer selectively transmits the desired wavelength range while blocking other wavelengths, thereby eliminating interference from natural light and improving detection precision without sacrificing the photodetector's inherent responsivity characteristics
Solution Approach 2:
The optical filtering layer is designed with spatially varying properties to achieve wavelength-selective transmission. By creating different regions with different filtering characteristics, the system allows the photodetector to maintain high responsivity for the target wavelength while blocking interfering wavelengths, thus resolving the contradiction between precision and environmental interference
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 semiconductor device achieves superior light detection by blocking interfering wavelengths and enhancing responsivity within the desired detection range, ensuring effective light energy conversion and signal generation.
Implementation Method 1
The optical filtering layer includes the first element, the second element, and the third element, and is formed on the window layer to block a portion of light having a wavelength in a predetermined wavelength range
Implementation Method 2
the quantum well layer 13 receives the light energy to generate an energy level transition, thereby generating an electrical signal corresponding to the light energy received by the quantum well layer 13
Implementation Method 3
the absorption layer 14 absorbs light energy of light entering from the light entering opening of the window layer 15 so as to transmit the light energy to the quantum well layer 13
Data Source
AI summary
A semiconductor device includes a substrate, a buffer layer, a gradient layer, an active layer, a window layer, and an optical filtering layer. The substrate includes a first element and a second element. The buffer layer is disposed on the substrate. The gradient layer is formed on the buffer layer, and includes sublayers. Each sublayer includes the first, second, and third elements. For each sublayer, a lattice constant thereof is adjusted by changing a ratio of the second element to the third element. The active layer is formed on the gradient layer, and includes the first, second, and third elements. The window layer is formed on the active layer. The optical filtering layer includes the first, second, and third elements, and is formed on the window layer to block a portion of light having a wavelength in a predetermined wavelength range.