Thieno-Containing Compounds for Stable Organic Electronics
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Solution Overview
Problem
Pentacene-based compounds face oxidation and self-reaction issues due to the formation of aromatic naphthalene units, disrupting conjugation and leading to poor device performance in optoelectronic applications, and exhibit edge-to-face conformation in the solid state, limiting intermolecular orbital interactions essential for efficient electron transfer.
Innovation Solution
Development of thieno-containing compounds with specific molecular structures, such as diindenothiophenes and dione precursors, which incorporate sulfur atoms to promote solid-state ordering and stability, and feature olefin positions that accommodate valency, enhancing conjugation and intermolecular interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pentacene is used as the organic material, then optoelectronic properties are achieved, but oxidation and self-reaction occur leading to poor device performance
Solution Approach 1:
The patent introduces thieno-containing compounds as intermediary structures between the pentacene core and the environment. The sulfur-containing thieno rings act as protective intermediaries that prevent direct oxidation of the pentacene core while maintaining the necessary optoelectronic properties. This intermediary structure resolves the contradiction by providing chemical stability without sacrificing device performance.
Solution Approach 2:
The patent creates composite molecular structures by combining pentacene units with thieno-containing moieties. This composite approach integrates the high mobility of pentacene with the enhanced stability of sulfur-containing compounds, achieving both reliability and chemical stability simultaneously. The composite structure prevents oxidation while maintaining optoelectronic functionality.
2Stability of the object's composition
If pentacene packs in edge-to-face conformation, then solid state structure is formed, but intermolecular orbital interactions are eliminated
Solution Approach 1:
The patent modifies the local quality of the molecular structure by introducing thieno-containing groups at specific positions on the pentacene core. These local modifications change the packing behavior in the solid state, enabling face-to-face or herringbone conformations that facilitate orbital overlap while maintaining structural stability. The local structural change resolves the contradiction between solid state structure and electron transfer efficiency.
3Stability of the object's composition
If thioether substitution is applied, then degradation is slowed, but conjugation is disrupted
Solution Approach 1:
The patent uses thieno rings as structural copies or analogs of simple thioether groups, but with improved properties. The thieno-containing moieties replicate the protective effect of thioethers against oxidation while maintaining better conjugation through their aromatic structure. This copying approach with optimization resolves the contradiction between degradation resistance and conjugation integrity.
Data Source
AI summary
Disclosed herein are embodiments of thieno-containing compounds suitable for use in electrical devices and/or electrooptical device. Also disclosed herein are methods of making the disclosed compounds, with particular embodiments of the method concerning a novel dione intermediate that may be used to make particular embodiments of the thieno-containing compounds.