Light Detection Device Partition Wall Refractive Index
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Solution Overview
Problem
There is a demand for improving the reliability of solid-state imaging apparatuses, particularly in preventing light leakage between color filters and maintaining the integrity of organic photoelectric conversion layers.
Innovation Solution
A light detection device with arrays of pixels, each comprising a color filter, a first photoelectric conversion layer, and an oxide semiconductor, where a partition wall with a refractive index lower than the color filter is placed between the pixels to prevent light leakage, and a sealing film with lower moisture transmittance than the color filter is used to protect the organic photoelectric conversion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition wall is placed between color filters to prevent light leakage, then light leakage is reduced, but device complexity increases
Solution Approach 1:
A partition wall made of resin material is introduced as an intermediary structure between adjacent color filters. This partition wall has a refractive index lower than that of the color filter, creating a refractive index difference that prevents light leakage at the boundaries while maintaining a relatively simple overall device structure.
2Reliability
If a sealing film with lower moisture transmittance is used to protect the organic photoelectric conversion layer, then reliability is improved, but device complexity increases
Solution Approach 1:
A sealing film is applied as a thin film structure over the organic photoelectric conversion layer. This sealing film has lower moisture transmittance than the color filter, providing effective moisture protection while maintaining a compact and relatively simple device architecture through the use of thin film technology.
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 enhances the sensitivity and reliability of the light detection device by preventing light leakage and protecting the organic photoelectric conversion layer from moisture and hydrogen, allowing for improved imaging performance and increased reliability.
Implementation Method 1
The partition wall is located in a gap between the color filters of the multiple pixels, and has a refractive index lower than that of the color filter
Implementation Method 2
The first photoelectric conversion layer detects light in a first wavelength range having transmitted through the color filter and performs photoelectric conversion to generate an electric charge
Data Source
AI summary
Provided is a light detection device having high reliability. The light detection device includes arrays of multiple pixels, and partition walls. The multiple pixels each include a color filter, a first photoelectric conversion unit, and an oxide semiconductor. The first photoelectric conversion unit detects light in the first wavelength range having transmitted through the color filter, performs photoelectric conversion, and generates an electric charge. The oxide semiconductor is configured to store the electric charge. The partition wall is located in a gap between the color filters of the multiple pixels, and has a refractive index lower than that of the color filter.