Hypervalent Iodine Oxidizing Agent in Hole-Transporting Layer
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Solution Overview
Problem
Photoelectric conversion elements experience a significant reduction in output when exposed to high illuminance, leading to decreased performance under low illuminance conditions due to charge leakage and recombination issues, primarily caused by the use of trivalent cobalt complex oxidizing agents that fail to form a sufficient electron-accepting compound in porous electron-transporting layers.
Innovation Solution
Incorporating a hypervalent iodine compound as an oxidizing agent in the hole-transporting layer, which is a small molecule that can effectively form an electron-accepting compound even in the pores of the electron-transporting layer, improving charge transport capabilities and reducing output loss under low illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trivalent cobalt complex oxidizing agents are used in the hole-transporting layer, then the photoelectric conversion element can operate, but the output significantly reduces after exposure to high illuminance due to insufficient electron-accepting compound formation in porous electron-transporting layers
Solution Approach 1:
The patent changes the chemical parameter of the oxidizing agent from trivalent cobalt complex to hypervalent iodine compound. This parameter change enables the oxidizing agent to effectively form electron-accepting compounds in the porous electron-transporting layer, preventing charge leakage and recombination, thereby maintaining stable output after exposure to high illuminance.
2Productivity
If small molecule hypervalent iodine compounds are used as oxidizing agents, then charge transport capability is improved and output loss is reduced, but the device complexity increases due to material composition changes
Solution Approach 1:
The patent modifies the chemical composition parameter by introducing hypervalent iodine compounds as oxidizing agents in the hole-transporting layer. This change improves charge transport capability and reduces output loss under varying illuminance conditions, accepting increased material composition complexity as a trade-off for performance improvement.
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 use of hypervalent iodine compounds enhances the photoelectric conversion element's ability to maintain output stability across varying illuminance conditions, preventing charge leakage and recombination, thus ensuring consistent performance even after exposure to high illuminance.
Implementation Method 1
Incorporating a hypervalent iodine compound as an oxidizing agent in the hole-transporting layer, which is a small molecule that can effectively form an electron-accepting compound even in the pores of the electron-transporting layer
Implementation Method 2
a photoelectric conversion element includes a first electrode, an electron-transporting layer, a hole-transporting layer, and a second electrode
Data Source
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AI summary
Provided is a photoelectric conversion element including a first electrode, an electron-transporting layer, a hole-transporting layer, and a second electrode, wherein the hole-transporting layer includes a hole-transporting material, an alkali metal salt, and a hypervalent iodine compound.