Photoelectric Conversion Film Composition for Green Light Response
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Solution Overview
Problem
Existing photoelectric conversion elements fail to achieve high responsiveness to green light.
Innovation Solution
A photoelectric conversion element comprising a conductive film, a photoelectric conversion film, and a transparent conductive film, where the photoelectric conversion film contains a first compound and a second compound with specific absorption wavelengths and a bulk heterojunction structure, enhancing responsiveness to green light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoelectric conversion element with conventional compounds is used, then the structure is simple, but the responsiveness to green light is insufficient
Solution Approach 1:
The photoelectric conversion film uses a composite material system comprising a first compound (Formula 1 or 2) and a second compound (Formula 3 or 4) in specific combinations. This composite approach enables simultaneous optimization of green light responsiveness and blue light absorption suppression, which cannot be achieved with single compounds or conventional materials.
Solution Approach 2:
The invention optimizes specific parameters including the maximal absorption wavelengths (λ1 and λ2) of the two compounds, their molar ratio (0.1 to 10), and the relationship between λ1 and λ2 (40 nm ≤ λ1 - λ2 < 100 nm). By precisely controlling these parameters, the photoelectric conversion element achieves high green light responsiveness while suppressing blue light absorption.
2Reliability
If the photoelectric conversion film absorbs blue light, then the overall light absorption is enhanced, but the responsiveness to green light is reduced
Solution Approach 1:
The photoelectric conversion film exhibits local quality in terms of wavelength-selective absorption. The first compound is specifically designed to absorb green light (maximal absorption wavelength λ1 in 500-620 nm) while the second compound absorbs blue light (maximal absorption wavelength λ2 in 450-550 nm). By controlling the absorption characteristics of each component locally at different wavelength regions, the film achieves high green light responsiveness while managing blue light absorption.
Solution Approach 2:
The invention controls the parameter of blue light absorption by selecting compounds with specific absorption characteristics. The second compound (Formula 3 or 4) has a maximal absorption wavelength λ2 in the blue light region (450-550 nm), and by optimizing λ2 and the ratio between the two compounds, blue light absorption is managed to prevent it from compromising green light responsiveness.
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 element achieves improved responsiveness to green light by suppressing blue light absorption and selectively enhancing performance for green light.
Implementation Method 1
a photoelectric conversion element comprising a conductive film, a photoelectric conversion film, and a transparent conductive film... the photoelectric conversion film contains a first compound and a second compound... maximal absorption wavelength λ1 of the first compound and a maximal absorption wavelength λ2 of the second compound
Data Source
AI summary
The present invention provides a photoelectric conversion element having excellent responsiveness to green light, and provides an imaging element and an optical sensor each including the photoelectric conversion element. The photoelectric conversion element of the present invention is a photoelectric conversion element including a conductive film, a photoelectric conversion film, and a transparent conductive film in this order, in which the photoelectric conversion film contains a first compound represented by Formula (1) and a second compound which is a compound different from the first compound, and a maximal absorption wavelength λ1 of the first compound and a maximal absorption wavelength λ2 of the second compound satisfy a relationship of an expression (X).-20 nm≤λ1-λ2≤20 nmExpression (X)