Soluble Polyacene Transistors with High-Permittivity Binder
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Solution Overview
Problem
Organic thin film transistors (OTFTs) face challenges in achieving a combination of high charge carrier mobility, electrical, mechanical, and thermal stability, with existing materials either being brittle or having low mobility, and there is a need for uniform performance across devices to ensure consistent quality in display applications.
Innovation Solution
A semiconductor composition comprising a soluble polyacene semiconductor and a polymeric binder with a permittivity greater than 3.4, specifically designed to enhance charge mobility and stability, while allowing for uniform deposition and patterning, thereby improving the performance and consistency of OTFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If non-polymeric soluble pentacene molecules are used with polymer binders having permittivity ≤ 3.3, then charge carrier mobility is improved (up to 1.44 cm²/Vs), but device configuration is limited to top gate only and bottom gate performance is substantially reduced
Solution Approach 1:
The patent changes the permittivity parameter of the polymer binder from ≤3.3 to >3.3 (specifically using binders with permittivity between 3.4-4.0), which fundamentally alters the electrical properties of the semiconductor layer and enables high charge carrier mobility in both top gate and bottom gate configurations
Solution Approach 2:
The patent creates a composite material system combining soluble polyacene semiconductor molecules with polymer binders of optimized permittivity, achieving synergistic effects that provide both high charge carrier mobility and mechanical flexibility across different device architectures
2Speed
If high charge carrier mobility materials are used, then charge carrier mobility is improved, but mechanical flexibility is worsened due to brittle layers
Solution Approach 1:
The patent forms a composite semiconductor layer by combining soluble polyacene molecules with polymer binders, where the polymer matrix provides mechanical flexibility and toughness while the polyacene molecules provide high charge carrier mobility, achieving both properties simultaneously
Solution Approach 2:
The polymer binder acts as an intermediary material that mediates between the rigid high-mobility polyacene molecules and the flexible substrate, transferring mechanical stress and preventing brittle fracture while maintaining electrical performance
3Productivity
If transistor dimensions are reduced, then device integration is improved, but performance uniformity is worsened due to increased variability
Solution Approach 1:
The patent optimizes the permittivity parameter of the polymer binder to >3.3, which improves the electrical stability and charge transport characteristics of the semiconductor layer, reducing performance variability even in miniaturized devices with reduced channel lengths
Solution Approach 2:
The soluble polyacene/polymer binder formulation enables homogeneous deposition of the semiconductor layer, ensuring uniform material distribution and consistent electrical properties across the entire device array, which is critical for maintaining performance uniformity in high-density integrated circuits
Data Source
AI summary
A semiconductor composition which comprises a soluble polyacene semiconductor and a polymeric semiconducting binder the binder having a permittivity greater than 3.4 at 000 Hz. The charge mobility of the semiconducting binder when measured in a pure state is greater than 10−7 cm2/Vs and more preferably greater than 10−6 cm2/Vs. Organic thin film transistors in which the source and drain electrodes are bridged by the semiconductor composition have desirable properties of reproducibility and charge mobility. The organic semiconducting composition can be applied by solution coating.