Pt Oxide Electrode Resistance Switching Device
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Solution Overview
Problem
Conventional resistance switching devices with a Pt/Nb:SrTiO3 structure require long pulse voltages for switching due to low response characteristics and experience decreased retention characteristics at high temperatures, limiting their use in next-generation non-volatile memory applications.
Innovation Solution
A resistance switching device with an n-type oxide semiconductor and electrodes forming a Schottky junction, where the first electrode has an oxygen-containing layer of gold or platinum oxide, improving resistance variation and response characteristics by facilitating easier oxygen exchange at the interface, even with short voltage pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a Pt/Nb:SrTiO3 Schottky junction structure is used, then resistance variation phenomenon is achieved, but response characteristics are low requiring long pulse voltage
Solution Approach 1:
The invention changes the chemical state parameter of the Pt electrode by forming Pt oxide on its surface. This parameter change enables easier oxygen exchange between the electrode and semiconductor, reducing the pulse voltage duration from long to short while maintaining resistance switching functionality
Solution Approach 2:
The Pt oxide layer acts as an intermediary substance between the Pt electrode and Nb:SrTiO3 semiconductor. It facilitates oxygen exchange by serving as an oxygen reservoir, enabling fast resistance switching without requiring long pulse voltages
2Reliability
If a Pt/Nb:SrTiO3 Schottky junction structure is used, then resistance variation phenomenon is achieved, but retention characteristics are decreased at high temperature
Solution Approach 1:
The invention changes the chemical composition parameter of the electrode interface by introducing Pt oxide. This modification stabilizes the Schottky junction at high temperatures, preventing degradation of retention characteristics that occurs with conventional Pt electrodes
3Speed
If an oxygen-containing layer of Pt oxide is formed on the first electrode, then response characteristics are improved with short pulse switching, but device structure becomes more complex
Solution Approach 1:
The Pt oxide layer is formed preliminarily on the Pt electrode surface before device operation. This preliminary oxidation creates the necessary oxygen exchange capability that enables fast switching, eliminating the need for complex control mechanisms during operation
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 device achieves enhanced resistance variation ratio, response characteristics, and retention characteristics, enabling faster switching and improved memory performance, particularly at elevated temperatures.
Implementation Method 1
facilitating easier oxygen exchange at the interface
Implementation Method 2
a Schottky junction which provides resistance variation/memory characteristics
Data Source
AI summary
A resistance switching device having a high resistance variation ratio, an excellent response characteristic, an excellent resistance memory characteristic (retention characteristics) and an excellent repeat resistance. The resistance switching device comprises an n-type oxide semiconductor and first and second electrodes which are disposed so as to interpose at least a part of the n-type oxide semiconductor therebetween wherein a Schottky junction which provides resistance variation/memory characteristics by the application of voltage having different polarities between the first and second electrodes is formed at an interface between the n-type oxide semiconductor and the first electrode; and the first electrode is positioned such that it is in contact with the n-type oxide semiconductor, and has a lower layer which is formed from Au oxide or a Pt oxide or Au or Pt containing oxygen having the thickness of 1-50 nm.