Subphthalocyanine Photoelectric Layer with Low-Concentration Dopant
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Solution Overview
Problem
Photoelectric conversion elements using subphthalocyanine derivatives suffer from low carrier mobility, leading to insufficient photoresponse due to inadequate conductivity characteristics, despite their superior wavelength selectivity.
Innovation Solution
A photoelectric conversion element is designed with a photoelectric conversion layer containing a subphthalocyanine or subphthalocyanine derivative and a carrier dopant, where the dopant concentration is less than 1% by volume ratio, improving carrier mobility and photoresponse while maintaining wavelength selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a subphthalocyanine derivative is used as the photoelectric conversion material, then wavelength selectivity is improved, but carrier mobility deteriorates
Solution Approach 1:
The patent changes the concentration parameter of the dopant in the photoelectric conversion layer. By controlling the dopant concentration to be within a specific range (0.1-5% by mass), the patent achieves optimal balance between carrier mobility and photoresponse, resolving the contradiction between improved wavelength selectivity and deteriorated carrier mobility
Solution Approach 2:
The patent creates a composite material system by combining subphthalocyanine derivative with specific dopants (such as MoO3, WO3, V2O5, or their nanocluster forms). This composite approach allows the subphthalocyanine to maintain its superior wavelength selectivity while the dopant enhances carrier mobility through charge transfer and conductivity improvement
2Reliability
If dopant concentration is increased to improve conductivity, then carrier mobility is improved, but photoresponse deteriorates
Solution Approach 1:
The patent precisely controls the dopant concentration parameter within the optimal range of 0.1-5% by mass. This parameter optimization ensures sufficient conductivity improvement while preventing excessive doping that would cause photoresponse deterioration. The patent identifies and maintains this critical concentration window through systematic experimentation
Solution Approach 2:
The patent applies partial doping rather than excessive doping. By using a moderate dopant concentration (0.1-5% by mass) rather than high concentration, the patent achieves the necessary conductivity enhancement for acceptable photoresponse while avoiding the detrimental effects of excessive doping on the photoelectric conversion efficiency
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
This configuration enhances the mobility of carriers in the photoelectric conversion layer, resulting in improved photoresponse and spectroscopic characteristics for imaging devices, effectively addressing the limitations of subphthalocyanine derivatives in existing technologies.
Implementation Method 1
an organic photoelectric conversion film having sensitivity to blue light (B), an organic photoelectric conversion film having sensitivity to green light (G), and an organic photoelectric conversion film having sensitivity to red light (R) are sequentially stacked
Implementation Method 2
a photoelectric conversion layer that is provided between the first electrode and the second electrode, and contains at least a subphthalocyanine or a subphthalocyanine derivative, and a carrier dopant
Data Source
AI summary
A photoelectric conversion element according to an embodiment of the disclosure includes a first electrode and a second electrode that are disposed to face each other and a photoelectric conversion layer that is provided between the first electrode and the second electrode, and contains at least a subphthalocyanine or a subphthalocyanine derivative, and a carrier dopant, in which the carrier dopant has a concentration of less than 1% by volume ratio to the subphthalocyanine or the subphthalocyanine derivative.