Organic Photoelectric Conversion Layer Dark Current Suppression
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Solution Overview
Problem
Existing organic photoelectric conversion elements fail to adequately reduce dark current generated between p-type and n-type organic semiconductor materials in the photoelectric conversion layer.
Innovation Solution
Incorporating a photoelectric conversion layer with a specific energy difference (ΔE ≥ 1.5 V) between a first organic compound with a lower oxidation potential and a second organic compound, along with setting the activation energy of dark current to 0.70 eV or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy difference ΔE between the first and second organic compounds is increased to 1.5 V or more, then dark current is reduced, but photoelectric conversion efficiency may be affected
Solution Approach 1:
The invention optimizes the energy level parameters by setting the oxidation potential of the first organic compound to 5.0 eV or higher and the LUMO level of the second organic compound to -2.0 eV or lower, achieving ΔE of 1.5 V or more. This parameter optimization simultaneously reduces dark current while maintaining adequate photoelectric conversion efficiency by ensuring proper energy alignment for charge separation.
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 effectively suppresses dark current generation due to thermal charge separation, leading to a reduction in dark current and improved photoelectric conversion efficiency.
Implementation Method 1
a photoelectric conversion layer disposed between the anode and the cathode... the photoelectric conversion layer contains a first organic compound and a second organic compound
Implementation Method 2
dark current that is generated between a p-type organic semiconductor material and an n-type organic semiconductor material in the photoelectric conversion layer... ΔE≥1.5 [V]... effectively suppresses dark current generation due to thermal charge separation
Data Source
AI summary
A photoelectric conversion element including an anode, a cathode, and a photoelectric conversion layer, wherein the photoelectric conversion layer contains a first organic compound and a second organic compound, and difference between oxidation potential of first organic compound and reduction potential of second organic compound is larger than 1.5 [V], and the first organic compound is any one of general formulae [1] below, a fluoranthene derivative, and a metal complex,R1 represents a hydrogen atom or a substituent, Ar1, Ar2, and Z1 represents a substituent, n1 and n2 represents an integer of 0 to 4, and X1 to X3 represents a nitrogen atom, a sulfur atom, an oxygen atom, or a carbon atom.