Cerium IV Complexes as P-Dopants for Organic Electronics
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Solution Overview
Problem
Existing organic semiconductor materials face challenges with volatile and costly p-dopants, high absorption coefficients, unstable evaporation rates, and low thermostability, limiting their use in doped semiconductors and electronic components.
Innovation Solution
Cerium (IV) complexes, specifically those of the general formula (I) with defined bidentate ligands, are used as p-dopants and electron transport materials, offering improved conductivity, thermostability, and doping efficiency, suitable for both vacuum coating and solvent-based processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known p-dopants (TCNQ, F4TCNQ, HATNA, MoO3, WO3) are used for doping organic semiconductors, then electron acceptor properties and hole generation are achieved, but volatility, high absorption coefficient, unstable evaporation rate, and low thermostability occur
Solution Approach 1:
The patent changes the chemical parameters of the dopant by using cerium (IV) complexes with specific ligand structures (β-diketonates, arylamidines, pyridinediones) instead of traditional organic acceptors. This parameter change fundamentally alters the thermal stability, evaporation characteristics, and cost structure while maintaining the electron acceptor function necessary for p-doping organic semiconductors
Solution Approach 2:
The invention employs composite cerium (IV) complexes combining the metal center with various organic ligands (β-diketonates, arylamidines, pyridinediones) to create materials that exhibit both the desired electron acceptor properties and improved thermostability. These composite materials overcome the limitations of purely organic dopants by integrating inorganic metal stability with organic molecular versatility
2Object-generated harmful factors
If traditional p-dopants are used, then doping function is achieved, but high absorption coefficient causes parasitic absorption
Solution Approach 1:
The cerium (IV) complexes exhibit different optical properties compared to traditional organic dopants, with reduced absorption in the visible range. This parameter change in the optical spectrum minimizes parasitic absorption while the Ce(IV)/Ce(III) redox couple maintains effective electron acceptance and hole generation capability
Solution Approach 2:
The patent employs cerium (IV) complexes that can be used in very low concentrations (0.1-10 wt%) due to their high doping efficiency. This allows the use of minimal amounts of dopant material, reducing the overall impact of any absorption and lowering the total material cost
3Productivity
If volatile p-dopants are used for doping, then doping efficiency is achieved, but unstable evaporation rate complicates vacuum coating
Solution Approach 1:
The cerium (IV) complexes exhibit different volatility parameters compared to traditional organic dopants. The presence of the metal center and specific ligand structures results in lower vapor pressure and more stable evaporation rates, enabling reliable vacuum coating processes while maintaining effective doping functionality
Solution Approach 2:
The patent achieves stable evaporation by designing cerium complexes with specific local molecular structures (coordination geometry, ligand field) that provide consistent intermolecular interactions. This local structural quality translates to uniform evaporation behavior and stable deposition rates during vacuum coating
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
Cerium (IV) complexes provide effective p-doping and electron transport in organic electronic components with enhanced conductivity, reduced parasitic absorption, and improved stability, making them suitable for various organic and hybrid opto-electronic components.
Implementation Method 1
For p-doping strong electron acceptors (p-dopants) are used, which remove an electron from the HOMO of the semiconductor matrix (p-doping), resulting in a hole
Implementation Method 2
the LUMO of the dopant must be below the HOMO-energy of the matrix. The dopant acts as an acceptor and leaves a mobile hole (SOMO) in the matrix
Data Source
AI summary
The present invention relates to new cerium (IV) complexes. Further, the present invention relates to electronically doped semiconductor materials and an electronic component comprising cerium (IV) complexes. A further object of the invention is the use of the cerium (IV) complexes as electron acceptors, especially as p-dopants and electron transport materials in organic electronic components.