Organic Semiconductor Compounds with Donor Blocks
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Solution Overview
Problem
There is a need for organic semiconducting materials that enhance the properties of organic electronic components, such as improved radiation absorption and charge carrier mobility, to achieve higher efficiencies in components like transistors and solar cells.
Innovation Solution
Compounds with a specific structural element where at least one group M and one group N are linked via 2 C atoms, forming a donor block Z, which is linked as *-M-N—* or *—N-M-*, are used. These compounds have electron-withdrawing groups EWG1 and EWG2, and additional donor groups T1, T2, T3, and T4, flanked by terminal electron acceptor groups, leading to a broader and stronger absorption of radiation and enhanced charge carrier mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic semiconducting materials are used, then device structure and processing are simpler, but radiation absorption and charge carrier mobility are insufficient
Solution Approach 1:
The patent employs composite molecular structures combining electron-donating groups (M and N) with electron-withdrawing groups (EWG1 and EWG2) to create compounds with enhanced radiation absorption and charge carrier mobility. The specific composite structure *-M-N-* where M and N are linked via 2 carbon atoms forms a donor block that synergistically improves optical and electrical properties while maintaining processability
Solution Approach 2:
The patent systematically varies molecular parameters including the number and position of donor groups (T1-T4), the identity of groups M and N, and the electron-withdrawing groups (EWG1 and EWG2) to optimize radiation absorption across different spectral ranges. This parameter optimization enables tuning of optical density and charge carrier mobility without fundamentally changing the core molecular architecture
2Reliability
If conventional organic semiconducting materials are used, then manufacturing cost is lower, but charge carrier mobility and optical density are insufficient
Solution Approach 1:
The molecular structure is segmented into distinct functional blocks: electron-donating groups M and N linked via 2 carbon atoms form a donor block, flanked by electron-withdrawing groups EWG1 and EWG2, with additional donor groups T1-T4. This segmentation allows independent optimization of each block's properties while maintaining overall molecular stability and synthesizability through modular assembly
3Productivity
If conventional organic semiconducting materials are used, then device simplicity is maintained, but fill factor and open-circuit voltage in solar cells are insufficient
Solution Approach 1:
The patent introduces specific local structural features within the molecular compound, particularly the *-M-N-* donor block where groups M and N are linked via exactly 2 carbon atoms. This localized structural motif creates specific electronic properties that enhance charge separation and transport at the molecular level, directly improving fill factor and open-circuit voltage without requiring complex device architectures
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 compounds exhibit strong absorption of radiation, leading to elevated efficiencies in organic photoactive components, with improved charge carrier mobility and optical density, particularly in the visible spectral range, resulting in higher fill factors, open-circuit voltage, and short-circuit current density in solar cells.
Implementation Method 1
the compounds of the invention, by the common structural element in the donor block Z, that at least one group M and one group N are each linked in such a way that at least one N atom of the group M and one O atom of the group N are each joined to one another via 2 C atoms, these compounds broadly and strongly absorb radiation, especially light
Data Source
AI summary
A compound of a formula EWG1-(T1)a-(T2)b-(Z)c-(T3)d-(T4)e-EWG2 capable of use as a functional component in organic electronic devices, which enable improved absorption in organic solar cells or have an increased charge carrier mobility.