Heterocyclic Polymer for Organic Transistor Mobility
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Solution Overview
Problem
Organic transistors using certain polymer compounds exhibit insufficient carrier mobility in bottom gate-bottom contact device structures, while top gate-bottom contact structures require complex processes to minimize active layer damage during gate insulating film formation.
Innovation Solution
A polymer compound with specific structural units, including heterocyclic rings and aromatic groups, is developed to enhance carrier mobility in both bottom gate-bottom contact and top gate-bottom contact device structures, allowing for easier production and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a top gate-bottom contact device structure is used to achieve relatively high carrier mobility, then carrier mobility is improved, but the production process becomes complex due to the need to form a gate insulating film on the active layer
Solution Approach 1:
The patent inverts the conventional top gate-bottom contact structure by implementing a bottom gate-bottom contact structure, where the gate electrode is positioned at the bottom rather than the top. This inversion simplifies the production process by eliminating the need to form a gate insulating film on the active layer, while the patent achieves its technical goal of maintaining high carrier mobility through specific polymer compound formulations
2Ease of manufacture
If a bottom gate-bottom contact device structure is used to simplify the production process, then ease of manufacture is improved, but carrier mobility becomes insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure and composition of the polymer compound used in the active layer. Specifically, it employs polymers with particular heterocyclic ring structures and side chain configurations that enhance charge carrier mobility, thereby achieving high performance in the simplified bottom gate-bottom contact device structure
3Ease of manufacture
If a conventional polymer compound is used in bottom gate-bottom contact structure, then ease of manufacture is maintained, but device performance is limited due to insufficient carrier mobility
Solution Approach 1:
The patent utilizes composite material strategies by designing polymer compounds with multiple functional components including heterocyclic core structures, electron-withdrawing groups, and specifically engineered side chains. This composite molecular architecture enables the material to simultaneously provide ease of manufacture through solution processability and high device performance through enhanced carrier mobility
Data Source
AI summary
A polymer compound comprising a structural unit represented by the formula (1):wherein a ring A and a ring B represent a heterocyclic ring. A ring C represents a condensed aromatic heterocyclic ring not having a line-symmetric axis and a rotational axis. Z1 and Z2 represent a group represented by the formula (Z-1), a group represented by the formula (Z-2), a group represented by the formula (Z-3), a group represented by the formula (Z-4), a group represented by the formula (Z-5), a group represented by the formula (Z-6) or a group represented by the formula (Z-7).R represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an alkylthio group, a cycloalkylthio group, an aryl group or a monovalent heterocyclic group.].