NTCDI Derivatives for Organic Solar Cell Electron Transport
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Solution Overview
Problem
The development of organic solar cells is hindered by the limited availability of materials with suitable semiconducting, chemical, and thermal properties, particularly for optically active and electron transport layers, which affects efficiency and stability.
Innovation Solution
The use of compounds with specific molecular structures, such as those described by formula (I), in electron transport layers, exciton blocking layers, and acceptor roles, which offer high HOMO-LUMO gaps for efficient electron transport and exciton blocking, and can be doped for enhanced conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport materials (such as TiO2, C60, NTCDA) are used in organic solar cells, then device structure and function can be achieved, but material availability is limited and morphological stability is poor
Solution Approach 1:
The patent applies parameter changes by systematically varying the molecular structure of electron transport materials through different substituents (R1, R2, R3, R4, R5, R6) on the core aromatic compound. This allows optimization of key parameters including HOMO-LUMO gap, electron mobility, and thermal stability while maintaining morphological stability across different device configurations
Solution Approach 2:
The patent employs composite materials by combining the core aromatic compound structure with various functional groups and substituents to create electron transport materials that integrate multiple desirable properties: high electron mobility, appropriate energy levels for interface matching, and enhanced thermal and morphological stability
2Loss of energy
If materials with high charge carrier mobility are selected for the heterojunction, then recombination loss is reduced, but the choice of suitable materials remains very limited
Solution Approach 1:
The patent systematically adjusts molecular parameters including substituent types, positions, and configurations to optimize charge carrier mobility while minimizing recombination losses. The core aromatic structure with variable substituents enables fine-tuning of electron transport properties without sacrificing material versatility
Solution Approach 2:
The patent applies local quality by introducing specific functional groups at particular positions on the aromatic core to enhance electron mobility in critical regions while maintaining overall material stability and compatibility with other device layers
3Illumination intensity
If transparent electron transport materials are used, then optical performance is improved, but semiconducting properties and morphological stability are compromised
Solution Approach 1:
The patent optimizes the balance between optical transparency and semiconducting properties by adjusting the HOMO-LUMO gap through substituent selection. Materials are designed with energy levels that ensure transparency in the visible range while maintaining appropriate electron affinity and mobility for effective charge transport
Solution Approach 2:
The patent creates composite electron transport materials that combine transparent aromatic core structures with functional groups that enhance semiconducting properties and morphological stability, achieving a synergistic effect that satisfies both optical and electrical requirements
4Reliability
If doping is applied to enhance conductivity, then charge carrier density increases, but material stability and device lifetime are reduced
Solution Approach 1:
The patent implements self-service by designing electron transport materials with intrinsic high electron mobility and appropriate energy levels that enable effective charge transport without requiring heavy doping. The molecular structure itself provides the necessary conductivity through optimized HOMO-LUMO gaps and electron affinity, reducing reliance on extrinsic doping that would compromise stability
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
These compounds improve the efficiency and stability of organic solar cells by facilitating effective electron transport and exciton blocking, leading to increased photocurrent generation and temperature stability, while being compatible with existing materials like fullerenes.
Implementation Method 1
The optically active materials are typically used in a donor-acceptor heterojunction, where at least one of the donor or acceptor is the light absorbing material. The interface of the donor-acceptor heterojunction is responsible for separating the generated excitons into charge carriers.
Data Source
Figure 1~2
AI summary
The present invention relates to new naphthalene carbodiimide (NTCDI) derivatives, and organic electronic device using the same and especially to an organic solar cell. The new NTCDI derivatives are used as acceptor, electron transport material, and doped electron transport materials.