Carbon Nanotube N-Type Conversion via Conjugated Polymer Attachment
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Solution Overview
Problem
Current methods for converting carbon nanotube (CNT) field-effect transistors (FETs) into n-type semiconductor devices are complex and costly, often requiring vacuum heating, ion doping, or additional steps for forming polarizable thin films, which increase production time and cost.
Innovation Solution
A carbon nanotube composite with a conjugated polymer attached to its surface and an organic compound with a carbon-nitrogen bond is used, integrated into a semiconductor device structure with a bottom-gate or top-gate configuration, simplifying the production process by eliminating the need for additional doping or heating steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum heating treatment or ion doping is used to convert CNT-FET into n-type semiconductor device, then the semiconductor type is converted, but the production process becomes complex and costly
Solution Approach 1:
The patent changes the chemical parameters of the CNT surface by attaching conjugated polymers with specific functional groups (electron-withdrawing groups) to convert the semiconductor type from p-type to n-type. This chemical modification approach replaces complex physical processes like vacuum heating and ion doping, simplifying the production process while achieving the desired semiconductor type conversion.
Solution Approach 2:
The patent introduces conjugated polymers as intermediary substances that attach to the CNT surface to mediate the conversion from p-type to n-type semiconductor. These polymers act as a bridge, providing electron withdrawal through their functional groups to change the electrical characteristics without requiring direct ion doping or high-temperature vacuum treatment.
2Reliability
If additional steps for forming polarizable thin films are added to create n-type FET, then the n-type characteristics are achieved, but the production time increases
Solution Approach 1:
The patent merges the semiconductor type conversion process with the existing CNT-FET fabrication process by incorporating conjugated polymer attachment during the same production step. This eliminates the need for separate vacuum heating or ion doping steps, achieving n-type characteristics without increasing production time.
Solution Approach 2:
The patent performs the semiconductor type conversion action preliminarily by pre-attaching conjugated polymers with electron-withdrawing groups to the CNT surface before final device assembly. This preliminary chemical modification ensures n-type characteristics are established early in the process, avoiding time-consuming post-processing steps.
3Adaptability or versatility
If different materials are selected for p-type FET and n-type FET to form complementary circuit, then the complementary circuit functionality is achieved, but the production efficiency decreases and cost increases
Solution Approach 1:
The patent achieves universality by using the same base material (CNT) for both p-type and n-type FETs in the complementary circuit. By controlling the surface chemistry through selective polymer attachment, the same CNT-FET structure can function as either p-type or n-type, eliminating the need for different semiconductor materials and simplifying production.
Solution Approach 2:
The patent applies local quality modification by attaching different conjugated polymers with specific functional groups to specific CNT-FETs based on the desired semiconductor type. This localized chemical modification allows p-type and n-type devices to be created from the same base material through targeted surface functionalization, maintaining production efficiency while achieving complementary circuit functionality.
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 enables the production of n-type semiconductor devices and complementary devices in simpler processes, reducing production costs and time while maintaining high functionality for wireless communication applications.
Implementation Method 1
Non-Patent Document 2 is a study on charge transfer interaction between amine-containing molecules
Implementation Method 2
the second insulating layer contains an organic compound containing a bond between a carbon atom and a nitrogen atom
Data Source
Figure 1~2
Figure 3~4
Figure 5(a)~5(e)
AI summary
An excellent complementary semiconductor device is provided using a simple process. An n-type drive semiconductor device including a substrate; and a source electrode, a drain electrode, a gate electrode, a gate insulating layer, and a semiconductor layer on the substrate; and including a second insulating layer on the opposite side of the semiconductor layer from the gate insulating layer; in which the second insulating layer contains an organic compound containing a bond between a carbon atom and a nitrogen atom; and in which the semiconductor layer contains a carbon nanotube composite having a conjugated polymer attached to at least a part of the surface thereof.