Organic Field Effect Transistor Doped Layer Threshold Control
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Solution Overview
Problem
The widespread application of organic field effect transistors (OFETs) is limited due to their low performance and stability, despite advancements since their invention in the 1980s, and there is a need for improved structures that can tune threshold voltage and enhance charge carrier injection.
Innovation Solution
An organic field effect transistor with a doped organic semiconducting layer between the gate insulator and the intrinsic organic semiconducting layer, where the thickness and dopant concentration of the doped layer are adjustable to control the threshold voltage and enable a high ON/OFF ratio, allowing for precise tuning of the transistor's parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a doped organic semiconducting layer is introduced between the gate insulator and the intrinsic organic semiconducting layer, then the threshold voltage can be precisely tuned and charge carrier injection is enhanced, but the device structure becomes more complex
Solution Approach 1:
The organic semiconducting layer is segmented into two distinct layers: an intrinsic organic semiconducting layer and a doped organic semiconducting layer. The doped layer is positioned between the gate insulator and the intrinsic layer, with adjustable thickness and dopant concentration to independently control threshold voltage and charge carrier injection without affecting the bulk semiconductor properties
Solution Approach 2:
The doped organic semiconducting layer introduces local doping only in the region adjacent to the gate insulator, where it is most needed for threshold voltage control and charge carrier injection enhancement. The intrinsic organic semiconducting layer maintains its pure properties in the channel region, preserving high mobility while the doped layer provides the necessary electrical control
2Adaptability or versatility
If the doped organic semiconducting layer thickness and dopant concentration are increased to improve threshold voltage tuning range, then the ON/OFF ratio increases, but the charge carrier mobility in the channel may be reduced
Solution Approach 1:
The segmented structure separates the functions of threshold voltage control (performed by the doped layer near the gate) and charge transport (performed by the intrinsic layer in the channel). This allows independent optimization of each function without compromise
Solution Approach 2:
Doping is applied locally only in the region where it benefits threshold voltage control and charge injection, while the channel region remains intrinsic to maintain high charge carrier mobility. The doped layer's thickness and concentration can be tuned to achieve desired threshold voltage without interfering with channel transport
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 solution allows for precise tuning of the threshold voltage and achieves an ON/OFF ratio of at least four orders of magnitude, enhancing the performance and stability of OFETs by optimizing charge carrier injection and channel formation.
Implementation Method 1
a doped organic semiconducting layer (4) comprising an organic matrix material and an organic dopant. A charge carrier channel is formed between the first and second electrode in the doped organic semiconducting layer (4)
Implementation Method 2
a gate insulator (5) provided between the gate electrode (6) and the intrinsic organic semiconducting layer (3)
Data Source
AI summary
The disclosure relates to organic field effect transistors, and methods for producing organic field effect transistors. The organic field effect transistors may include a first electrode, and a second electrode, the electrodes providing a source electrode and a drain electrode, an intrinsic organic semiconducting layer in electrical contact with the first and second electrode, a gate electrode, a gate insulator provided between the gate electrode and the intrinsic organic semiconducting layer, and a doped organic semiconducting layer including an organic matrix material and an organic dopant.