Photoelectric Conversion Device Stray Light Suppression
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Solution Overview
Problem
Existing photoelectric conversion devices face issues with light use efficiency and stray light due to light reflection on wiring, which deteriorates optical characteristics.
Innovation Solution
A photoelectric conversion device is designed with a dielectric film and a light shielding member, where the dielectric member has a lower refractive index than the film and includes a silicon compound with lower nitrogen concentration and higher oxygen or argon concentration, optimizing the refractive index difference to reduce stray light and improve light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dielectric film is provided on a light shielding member in existing photoelectric conversion devices, then the wiring structure is completed and electrical insulation is achieved, but light reflection occurs on the wiring which deteriorates light use efficiency and generates stray light
Solution Approach 1:
The patent introduces a dielectric member with specific refractive index properties as an intermediary layer between the dielectric film and the light shielding member. This intermediary layer mediates the optical interaction by reducing the refractive index difference at the interface, thereby minimizing light reflection while maintaining the electrical insulation function of the original dielectric film structure.
Solution Approach 2:
The patent changes the refractive index parameter of the dielectric member to be lower than that of the dielectric film. This parameter change optimizes the optical characteristics by reducing the refractive index mismatch at the interface, which directly reduces light reflection and improves light use efficiency without compromising the wiring structure.
2Reliability
If a dielectric film is provided on a light shielding member in existing photoelectric conversion devices, then electrical insulation is achieved, but stray light occurs due to light reflection on the wiring
Solution Approach 1:
The dielectric member serves as an intermediary layer that reduces the refractive index difference between the dielectric film and the light shielding member. This intermediary structure maintains the electrical insulation function while simultaneously reducing light reflection that causes stray light, thus eliminating the harmful effect without compromising reliability.
Solution Approach 2:
By changing the refractive index parameter of the dielectric member to be lower than that of the dielectric film, the patent optimizes optical characteristics to reduce stray light generation while preserving the electrical insulation properties of the original dielectric film structure.
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 effectively suppresses stray light and enhances light use efficiency by guiding light and controlling reflections, resulting in improved optical characteristics.
Implementation Method 1
The dielectric member 30 includes a front surface 302 on which the inclined region 343 is formed. The dielectric member 30 has a refractive index lower than a refractive index of the dielectric film 40.
Implementation Method 2
light reflection on the wiring which deteriorates optical characteristics
Data Source
AI summary
There is provided a photoelectric conversion device in which a distance from a main surface to an inner surface of a first part of a dielectric film is smaller than a distance from the main surface to a top surface of a light shielding member, a distance from the main surface to an outer surface of the first part is smaller than a distance from the main surface to an outer surface of a second part of the dielectric film, an outer surface of a third part inclines to the top surface, a surface of a dielectric member inclines to the top surface, between the dielectric film and the top surface in a normal direction, and the dielectric member has a refractive index lower than a refractive index of the dielectric film.