Photosensitive Component Reflective Layer Light Utilization
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Solution Overview
Problem
Current X-ray detection substrates have a low utilization rate of light, leading to a small photocurrent and difficulty in increasing the signal-to-noise ratio due to the inefficient conversion of X-rays to electrical signals.
Innovation Solution
A photosensitive component is designed with a first electrode layer, a photoelectric conversion layer, a second electrode layer, an insulating layer with a transparent material, and a reflective layer that reflects light to the side surfaces of the photoelectric conversion layer, enhancing light utilization and photocurrent generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional photodiode structure is used, then the device complexity is low, but the light utilization rate is low resulting in small photocurrent
Solution Approach 1:
The patent introduces a reflective layer at the bottom of the photoelectric conversion layer, creating a mirror-like structure that reflects light back through the photoelectric conversion layer. This adds a dimensional element (the reflective path) that allows light to interact with the photoelectric conversion layer multiple times, thereby increasing light utilization without significantly complicating the overall device structure.
Solution Approach 2:
The insulating layer with transparent material serves as an intermediary between the photoelectric conversion layer and the reflective layer. It allows light to pass through to the reflective layer while maintaining electrical insulation, thus enabling the light reflection mechanism without direct electrical contact between layers.
2Productivity
If the photoelectric conversion layer area is increased to capture more light, then the photocurrent increases, but the device area and manufacturing complexity increase
Solution Approach 1:
The reflective layer enables continuous light interaction by reflecting unabsorbed light back through the photoelectric conversion layer. This creates a continuous cycle of light absorption and conversion, allowing the photoelectric conversion layer to utilize light more thoroughly over multiple passes, thereby increasing photocurrent without requiring a larger device area.
3Loss of energy
If a reflective layer is added to improve light utilization, then the photocurrent increases, but the manufacturing process complexity increases
Solution Approach 1:
The patent specifies that the insulating layer should have transparent material with specific optical properties (high transparency to the wavelength range of incident light). By controlling the material parameter (transparency) and thickness of the insulating layer, the manufacturing process becomes more standardized and predictable, easing the addition of the reflective layer function to existing production lines.
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 solution increases the area of the photoelectric conversion layer exposed to light, resulting in a higher photocurrent and improved signal-to-noise ratio for X-ray detection substrates.
Implementation Method 1
a reflective layer covering the insulating layer, the reflective layer being configured to reflect at least a part of light entering the insulating layer to the side surfaces of the photoelectric conversion layer
Implementation Method 2
The photodiode may convert visible light into an electrical signal
Data Source
AI summary
The present disclosure relates to a photosensitive component, a detection substrate and a method for manufacturing the detection substrate. The photosensitive component includes: a first electrode layer, a photoelectric conversion layer, a second electrode layer, an insulating layer and a reflective layer. The photoelectric conversion layer is located on the first electrode layer. The second electrode layer is located on a surface of the photoelectric conversion layer away from the first electrode layer. The insulating layer covers side surfaces of the photoelectric conversion layer and at least a part of a surface of the second electrode layer away from the photoelectric conversion layer, and the insulating layer includes a transparent material. The reflective layer covers the insulating layer, and the reflective layer is configured to reflect at least a part of light entering the insulating layer to the side surfaces of the photoelectric conversion layer.