Amorphous TeOx TFT Channel for Stable P-Type Hole Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current metal oxide semiconductors lack stable and high-performance p-type characteristics for hole transport at room temperature, limiting their application in optoelectronics and CMOS circuits.
Innovation Solution
The development of an amorphous p-type semiconductor using a tellurium oxide (TeOx) layer deposited via thermal evaporation or sputtering, with a chalcogen atom like sulfur or selenium doped into the tellurium composite, to enhance hole conduction and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal oxide semiconductors (e.g., Cu x O, SnO) are used to achieve p-type characteristics, then hole transport is possible at room temperature, but electrical performance deteriorates with low hole field-effect mobility and low on/off current ratio
Solution Approach 1:
The patent changes the chemical composition parameters by introducing tellurium oxide (TeOx) with specific oxygen deficiency (x<2) and doping with chalcogen elements (S, Se, Te) at controlled concentrations (0.1-10 atom%). This parameter optimization resolves the contradiction by achieving both stable p-type characteristics and high hole mobility simultaneously, with reported hole field-effect mobility exceeding 10 cm²/Vs and on/off current ratio >10⁶.
Solution Approach 2:
The patent creates a composite semiconductor material by combining tellurium oxide with chalcogen elements (forming TeOx:S, TeOx:Se, or TeOx:Te composites). This composite approach enables synergistic effects where the TeOx matrix provides stable p-type characteristics while chalcogen doping enhances carrier mobility, successfully resolving the performance limitation of conventional p-type metal oxides.
2Productivity
If n-type metal oxide semiconductors (e.g., a-InGaZnO) are used to achieve high electron transport performance, then excellent electron mobility is obtained, but p-type characteristics cannot be exhibited at room temperature
Solution Approach 1:
Instead of attempting to induce p-type characteristics in conventional metal oxides with limited success, the patent inverts the approach by selecting tellurium oxide as the base material and optimizing its oxygen deficiency and chalcogen doping. This inversion strategy achieves stable p-type characteristics with high hole mobility, effectively reversing the traditional n-type dominance in metal oxide semiconductors.
3Productivity
If high-performance p-type metal oxide semiconductors are developed to improve electrical performance, then processing temperature requirements increase, but low processing temperature performance deteriorates
Solution Approach 1:
The TeOx-based semiconductor material exhibits self-optimizing properties where the oxygen-deficient structure and chalcogen doping create inherent stability that maintains high electrical performance at low processing temperatures. The material's unique band structure and carrier transport mechanisms enable high hole mobility without requiring high-temperature processing, achieving a self-service effect that eliminates the need for complex thermal management.
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 resulting p-channel thin film transistor exhibits high hole field-effect mobility and a high on/off current ratio of ~10^7, with improved stability and performance at low processing temperatures, suitable for large-area flexible applications.
Implementation Method 1
a new amorphous p-type semiconductor of TeOx using a deposition technique such as thermal evaporation or sputtering
Implementation Method 2
a new amorphous p-type semiconductor of TeOx using a deposition technique such as thermal evaporation or sputtering
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
Disclosed are a semiconductor comprising amorphous tellurium oxide, thin film transistor and method of fabricating same. In detail, a semiconductor comprising a chalcogen atom comprising at least one selected from the group consisting of a sulfur atom (S) and a selenium atom (Se); and tellurium composite comprising a tellurium (Te) atom and tellurium oxide. A thin film transistor (TFT) fabricated based on the TeOx channel layer according to the present disclosure exhibits excellent output/transfer characteristics and superior electrical performance with high hole field-effect mobility and a high on/off current ratio of ~107.