Photo Detector Column Structure Mitigates Light Scattering
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Solution Overview
Problem
Conventional photo detectors with column structures suffer from light scattering due to irregular grains formed during the initial deposition of photo conversion materials, which degrades image resolution.
Innovation Solution
A photo detector is designed with a photo conversion element comprising a photo conversion material layer and a doped photo conversion material column structure layer, where the luminescent spectrum of the doped layer overlaps with the specific wavelength range received by the sensor element array, and the luminescent spectrum of the photo conversion material layer does not, preventing light scattering by ensuring better column structures are formed first and then the doped layer is added.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photo conversion material with column structures is deposited using conventional technique, then photo conversion function is achieved, but irregular grains are formed causing light scattering which degrades image resolution
Solution Approach 1:
The photo conversion element is divided into two distinct layers: a photo conversion material layer and a doped photo conversion material column structure layer. This segmentation allows each layer to perform its specific function - the first layer provides column structures without irregular grains, while the second layer performs photo conversion, thereby resolving the contradiction between achieving photo conversion function and maintaining image resolution.
Solution Approach 2:
The photo conversion material layer with column structures is formed first, establishing a stable columnar framework before the doped photo conversion material column structure layer is deposited. This preliminary action prevents irregular grain formation during the initial deposition stage, eliminating light scattering while preserving photo conversion capability.
2Power
If doped photo conversion material column structure layer is deposited first, then photo conversion efficiency is improved, but irregular grains are formed causing light scattering
Solution Approach 1:
The photo conversion material layer is deposited first to establish a uniform column structure framework, eliminating irregular grains before the doped layer is added. This preliminary action ensures that subsequent photo conversion material deposition occurs on a stable substrate, preventing light scattering while maintaining high photo conversion efficiency.
Solution Approach 2:
The photo conversion material layer acts as an intermediary layer between the substrate and the doped photo conversion material column structure layer. This intermediary layer provides a stable foundation that prevents irregular grain formation, allowing the doped layer to perform photo conversion efficiently without causing light scattering.
3Manufacturing precision
If photo conversion material layer with column structures is formed first, then light scattering is prevented, but additional layer formation is required
Solution Approach 1:
The photo conversion material layer serves multiple functions: it provides the column structure framework that prevents light scattering, acts as a substrate for the doped layer, and contributes to overall photo conversion capability. This multi-functionality justifies the additional layer by eliminating the need for complex doping processes in the first layer.
Solution Approach 2:
Different regions of the photo conversion element have different properties: the photo conversion material layer has uniform column structures optimized for preventing light scattering, while the doped photo conversion material column structure layer has dopant concentrations optimized for photo conversion efficiency. This local differentiation resolves the contradiction by allowing each layer to be optimized for its specific function.
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
This approach effectively mitigates light scattering, enhancing image resolution by ensuring the photo conversion material layer's light is not absorbed by the sensor array, thereby improving detection quality.
Implementation Method 1
a sensor element array for receiving light with a spectrum in a specific wavelength range
Implementation Method 2
a photo conversion element... where the photo conversion element includes a photo conversion material layer and a doped photo conversion material column structure layer
Implementation Method 3
A luminescent spectrum of the doped photo conversion material column structure layer is overlapped with the spectrum in the specific wavelength range
Data Source
AI summary
A photo detector and a method for fabricating the same are provided. The photo detector includes a first substrate and a photo conversion element. The first substrate has a sensor element array for receiving a light with a spectrum in a specific wavelength range. The photo conversion element is disposed on the sensor element array, where the photo conversion element includes a photo conversion material layer and a doped photo conversion material column structure layer. A luminescent spectrum of the doped photo conversion material layer column structure layer is overlapped with the spectrum in a specific wavelength range, and a luminescent spectrum of the photo conversion material layer is non-overlapped with the spectrum in a specific wavelength range.