Photoelectric Conversion Material for Fast, High-Yield Imaging Elements
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Solution Overview
Problem
Existing photoelectric conversion elements, particularly imaging elements, face challenges in achieving both high response speed and external quantum efficiency.
Innovation Solution
Incorporation of a photoelectric conversion element material represented by specific chemical formulas, including a condensed ring aromatic hydrocarbon group and electron-withdrawing groups, to form a layer that functions as a hole blocking material, enhancing both electron transport and hole blocking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional hole blocking materials (pyrimidine or triazine derivatives) are used, then the device structure is simple, but the response speed is slow and external quantum efficiency is low
Solution Approach 1:
The patent modifies the molecular parameters of hole blocking materials by introducing specific structural features: condensed ring aromatic hydrocarbon groups (16-40 carbon atoms) for thermal stability, electron-withdrawing groups for optimized energy levels, and aromatic hydrocarbon linkers (6-30 carbon atoms) for controlled molecular packing. These parameter changes enable simultaneous improvement in response speed and external quantum efficiency while maintaining manufacturing feasibility
Solution Approach 2:
The invention creates composite molecular structures by combining multiple functional moieties within a single molecule: the condensed ring aromatic hydrocarbon core (providing thermal stability), electron-withdrawing groups (controlling electron affinity and LUMO level), and aromatic hydrocarbon substituents (influencing molecular packing and film morphology). This composite approach allows the material to exhibit multiple desirable properties simultaneously, resolving the contradiction between performance and complexity
2Reliability
If the photoelectric conversion layer is optimized for high external quantum efficiency, then the efficiency improves, but the response speed decreases
Solution Approach 1:
The patent applies local quality by designing the hole blocking material with spatially differentiated functional groups: the condensed ring aromatic hydrocarbon core provides thermal stability and structural rigidity, while peripheral electron-withdrawing groups create localized electron-rich regions that facilitate rapid electron injection. This local functional differentiation allows the material to simultaneously support high external quantum efficiency through optimized electron transport and fast response speed through efficient charge separation at the interface
Solution Approach 2:
The invention introduces dynamic characteristics by optimizing the molecular structure to enable rapid conformational adjustments and efficient charge transfer dynamics. The flexible aromatic hydrocarbon linkers allow molecular reorientation for optimal electron transport pathways, while the electron-withdrawing groups facilitate rapid electron injection upon photoexcitation. This dynamic molecular behavior enables the material to adapt to different operational states, achieving both high external quantum efficiency and fast response speed
3Stability of the object's composition
If thermal stability is increased through molecular structure modification, then resistance to annealing improves, but manufacturing complexity increases
Solution Approach 1:
The patent achieves thermal stability by controlling key molecular parameters: the condensed ring aromatic hydrocarbon group with 16-40 carbon atoms provides rigid structural framework that resists thermal degradation, while the specific size ranges of aromatic hydrocarbon substituents (6-30 carbon atoms) optimize intermolecular interactions for thermal stability. These parameter optimizations enable the material to maintain compositional stability during annealing processes without requiring excessively complex molecular architectures that would hinder manufacturing
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 results in improved response speed and external quantum yield, with increased thermal stability and resistance to annealing, preventing decreases in efficiency and dark current.
Implementation Method 1
Photoelectric conversion elements are widely utilized in solar cells, photosensors, image sensors, and the like
Implementation Method 2
enhancing both electron transport and hole blocking properties
Implementation Method 3
provided is a photoelectric conversion element in which the layer containing the photoelectric conversion element material is a hole blocking layer
Data Source
Figure 1
AI summary
Provided are a photoelectric conversion element and an imaging element which are excellent in response speed and exhibit a high external quantum yield, and a photoelectric conversion element material that contributes to production of these elements. An imaging photoelectric conversion element (100) includes a layer containing a photoelectric conversion element material represented by formula (1) below, where EWG represents an electron-withdrawing group, L represents an aromatic hydrocarbon group having 6 to 30 carbon atoms, n represents 1 to 8, k represents 0 to 2, and p represents 1 to 8, where p is 1 if k is 0.