Photo-patternable OSC Polymers for OTFT Patterning
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Solution Overview
Problem
Traditional photolithography methods for patterning organic semiconductor layers in OTFTs involve harsh oxygen plasma and aggressive solvents, which can damage the OSC layer and deteriorate device performance.
Innovation Solution
Development of photo-patternable cross-bred organic semiconductor polymers with UV-curable side chains and photoinitiators, allowing for direct UV crosslinking and patterning, reducing the number of processing steps and avoiding harmful solvents and plasma etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional photolithography methods are used for patterning OSC layers, then pattern transfer can be achieved, but the OSC layer is damaged by harsh oxygen plasma and aggressive solvents, leading to deterioration of device performance
Solution Approach 1:
The OSC polymer is designed with built-in UV-curable side chains that enable the material to perform its own patterning function through direct UV irradiation, eliminating the need for external photoresist materials and harsh plasma/solvent processing steps that would otherwise damage the OSC layer
Solution Approach 2:
The patent replaces the mechanical/chemical etching system (oxygen plasma and aggressive solvents) with a photochemical crosslinking system that uses UV light to directly pattern the OSC layer, substituting a gentler photochemical process for the damaging physical/chemical etching processes
2Manufacturing precision
If traditional photolithography with photoresist is used, then patterning can be achieved, but the process becomes complex with multiple steps including photoresist coating, baking, development, and removal
Solution Approach 1:
The patent merges the OSC functional layer and the photoresist pattern layer into a single integrated material system where the OSC polymer contains both the semiconducting function and the UV-curable side chains, allowing one material to serve multiple functions simultaneously
Solution Approach 2:
The OSC polymer is designed as a multi-functional material that simultaneously provides semiconducting properties for transistor operation and photo-curable properties for self-patterning, eliminating the need for separate photoresist materials and multiple processing steps
3Reliability
If conventional OSC polymers are used, then good semiconducting properties can be achieved, but phase separation issues occur and solvent resistance is poor, affecting reproducibility
Solution Approach 1:
The patent creates a composite structure within the polymer chain by incorporating UV-curable side chains into the OSC polymer backbone, forming an intrinsically cross-bred material that combines the semiconducting properties of the main chain with the crosslinking capability of the side chains, eliminating phase separation between different materials
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
This approach enhances patterning efficiency, improves device performance, and reduces manufacturing costs by eliminating phase separation issues and increasing solvent resistance, leading to better reproducibility and higher temperature resistance of OTFT devices.
Implementation Method 1
photo-patternable cross-bred organic semiconductor polymers with UV-curable side chains and photoinitiators, allowing for direct UV crosslinking and patterning
Data Source
AI summary
A polymer blend, including at least one organic semiconductor (OSC) polymer, such that: the at least one OSC polymer is a diketopyrrolopyrrole-fused thiophene polymeric material, the fused thiophene is beta-substituted, the at least one OSC polymer has a first portion and a second portion, and at least one of the first portion or the second portion includes at least one UV-curable side chain.