TeOx Chalcogen Thin Films for Stable P-Type TFT Channels
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Solution Overview
Problem
Commercially available metal oxide semiconductors are predominantly n-type, limiting their application in fields requiring p-type semiconductors for hole transport due to poor electrical performance and instability in ambient conditions.
Innovation Solution
A method for preparing amorphous p-type TeOx:M thin films using sputtering, where M is Se or S, by controlling the composition and alloy amount to enhance charge and mobility, and fabricating a thin film transistor with high stability and performance at low processing temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional n-type metal oxide semiconductors are used, then electron transport efficiency is improved, but hole transport capability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing chalcogen elements (S, Se, Te) into the In-Ga-Zn-O system, creating In-Ga-Zn-O-S/Se/Te alloy films with adjustable stoichiometry. This compositional parameter change enables the material to exhibit p-type characteristics while maintaining amorphous structure, thus achieving hole transport capability without sacrificing the established electron transport efficiency of n-type materials.
Solution Approach 2:
The patent creates composite material systems by combining In-Ga-Zn-O with chalcogen elements (S, Se, Te) to form alloyed thin films. These composite materials integrate the beneficial properties of both components: the oxide framework provides structural stability and electron transport pathways, while the chalcogen additions introduce hole transport capabilities through modified band structure and defect engineering, enabling dual-polarity functionality.
2Adaptability or versatility
If p-type metal oxide semiconductors such as CuxO and SnO are used, then hole transport capability is improved, but electrical performance deteriorates
Solution Approach 1:
The patent applies local quality modification by creating specific defect structures and compositional variations within the In-Ga-Zn-O-S/Se/Te alloy films. By controlling the local distribution of chalcogen elements and oxygen vacancies, the material achieves high hole field effect mobility in specific regions while maintaining overall structural integrity and amorphous phase stability, thus overcoming the uniformly poor electrical performance of conventional p-type oxides.
Solution Approach 2:
The patent optimizes electrical performance by precisely controlling compositional parameters (metal-to-chalcogen ratios, oxygen content) and processing parameters (deposition temperature, sputtering power). These parameter changes enable tuning of carrier concentration and mobility, achieving high hole field effect mobility that surpasses conventional p-type metal oxides while maintaining p-type characteristics.
3Adaptability or versatility
If p-type metal oxide semiconductors with metastable cationic valence states are used, then hole transport is improved, but ambient stability deteriorates
Solution Approach 1:
The patent employs a structural strategy where metastable cationic valence states (which provide hole transport) are stabilized within a robust amorphous oxide matrix. The In-Ga-Zn-O-S/Se/Te alloy structure acts as a protective framework that kinetically stabilizes the otherwise unstable p-type phases, allowing them to maintain both hole transport capability and ambient stability without requiring extreme processing conditions or specialized environments.
Solution Approach 2:
The patent creates composite material structures where p-type active phases are integrated within a stable oxide matrix. The In-Ga-Zn-O-S/Se/Te alloy system forms a composite structure where the oxide framework provides chemical stability and resistance to ambient degradation, while the chalcogen-modified regions maintain p-type characteristics and hole transport capability, thus resolving the stability-performance trade-off.
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 method achieves high hole field effect mobility and an on/off current ratio of ~10^5, enabling high-performance p-channel transistors with improved stability and flexibility.
Implementation Method 1
preparing the semiconductor thin film comprising an amorphous p-type semiconductor by performing co-deposition on a substrate by sputtering method using the target
Data Source
AI summary
Disclosed is a method of preparing a tellurium oxide thin film and a thin film transistor using sputtering. In detail, a method of preparing the semiconductor thin film, the method comprising: (a) providing a target comprising a chalcogen atom and a tellurium atom (Te) comprising at least one selected from the group consisting of sulfur atoms (S) and selenium atoms (Se); and (b) preparing a semiconductor thin film comprising an amorphous p-type semiconductor by co-deposition on a substrate using the target in an atmosphere of a mixed gas comprising argon gas and oxygen gas by a sputtering method. The semiconductor thin film channel layer according to the present disclosure has the effect of providing a thin film transistor (TFT) exhibiting excellent output/transfer characteristics and excellent electrical performance with high hole field effect mobility and an on/off current ratio of ˜105.