Organic Photoelectric Conversion Element for High Color Selectivity
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Solution Overview
Problem
Conventional photoelectric conversion elements using inorganic substances suffer from low color selectivity and reduced light utilization efficiency due to the need for color filters and smaller pixel sizes, leading to Moire defects and decreased sensitivity.
Innovation Solution
A photoelectric conversion element with a structure comprising a first and second electrode and at least one organic layer, where the organic layer contains a compound represented by a specific general formula, enabling high photoelectric conversion efficiency and color selectivity without the need for color filters, by selectively absorbing light in specific wavelength regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color filter is provided before a photoelectric conversion film to selectively transmit specific colors, then color selectivity is improved, but light utilization efficiency deteriorates due to interference between object pitch and image element pitch causing Moire defects
Solution Approach 1:
The invention extracts and removes the color filter component from the imaging system. Instead of using a separate color filter layer, the photoelectric conversion element itself is designed with organic photoelectric conversion layers that have inherent wavelength-selective absorption characteristics, thereby eliminating the need for color filters and avoiding Moire defects while improving light utilization efficiency
Solution Approach 2:
The invention applies local quality by designing different organic photoelectric conversion layers with specific absorption characteristics for different wavelength regions (e.g., blue, green, red regions). Each layer is optimized to absorb specific wavelengths based on its molecular structure, enabling color selection at the material level rather than through a separate filter component
2Reliability
If an optical lens is used to suppress Moire defects, then image quality is improved, but light utilization efficiency and aperture ratio deteriorate
Solution Approach 1:
The invention removes the need for optical lenses used for Moire suppression by eliminating color filters through the use of organic photoelectric conversion layers with inherent wavelength selectivity. This extraction of the color filter component eliminates the requirement for additional optical elements, thereby maintaining high light utilization efficiency and aperture ratio
3Manufacturing precision
If pixel size is reduced to achieve higher resolution, then image sensor resolution is improved, but sensitivity deteriorates due to decreased quantity of light reaching each pixel
Solution Approach 1:
The invention changes the material parameter of the photoelectric conversion layer from inorganic to organic materials. Organic photoelectric conversion materials have higher absorption coefficients and can be tailored with specific absorption spectra, enabling smaller pixels to maintain high sensitivity by efficiently absorbing available light in each wavelength region
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 provides a photoelectric conversion element with enhanced sensitivity and color selectivity, improving light utilization efficiency and reducing Moire defects, while maintaining mechanical strength and stability.
Implementation Method 1
a photoelectric conversion element for converting light into electric energy
Implementation Method 2
the organic compound can selectively absorb light in a specific wavelength region of light being incident according to a molecular structure
Data Source
AI summary
Disclosed is a photoelectric conversion element for converting light into electric energy, including a first electrode, a second electrode, and at least one organic layer existing therebetween, the organic layer containing a compound represented by the general formula (1):wherein R1 to R4 are alkyl groups, cycloalkyl groups, alkoxy groups, or arylether groups, which may be respectively the same or different; R5 and R6 are halogens, hydrogens, or alkyl groups, which may be respectively the same or different; R7 is an aryl group, a heteroaryl group, or an alkenyl group; M represents an m-valent metal and is at least one selected from boron, beryllium, magnesium, aluminum, chromium, iron, nickel, copper, zinc, and platinum; L is selected from halogen, hydrogen, an alkyl group, an aryl group, and a heteroaryl group; and m is in a range of 1 to 6 and, when m−1 is 2 or more, each L may be the same or different.