Halide Perovskite Resistive Memory for Flexible Substrates
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Solution Overview
Problem
Existing non-volatile resistive-switching memories face challenges with low stability at room temperature, low on-off resistance ratio, and environmental concerns due to the use of organic materials and lead, while also being inflexible and costly to produce.
Innovation Solution
A non-volatile resistive-switching memory using an inorganic-inorganic halide perovskite material with a layered structure, incorporating a phenylethylammonium ion and a halogen ion, which forms a compound like PEA2Cs3Pb4I13, and a flexible substrate with a graphene layer, allowing for improved electrical properties and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based inorganic material is used as resistive switching layer, then reliability is improved, but manufacturing cost increases and flexibility is lost due to high-temperature vacuum environment requirement
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature vacuum environment to low-temperature solution process, enabling fabrication on flexible substrates while maintaining device reliability through the stable perovskite crystal structure
Solution Approach 2:
The patent replaces the mechanical vacuum deposition process with a solution-based fabrication method, eliminating the need for expensive vacuum equipment and high-temperature processing while achieving comparable device performance
2Ease of manufacture
If organic metal halide perovskite is used as resistive switching layer, then ease of manufacture is improved, but stability at room temperature deteriorates
Solution Approach 1:
The patent creates a composite perovskite structure combining organic phenylethylammonium cations with inorganic CsPbI3 framework, where the inorganic component provides thermal stability while the organic component enables solution processing and room-temperature operation
Solution Approach 2:
The phenylethylammonium ion acts as an intermediary that stabilizes the CsPbI3 perovskite structure at room temperature, preventing phase transitions and degradation while maintaining the desired resistive switching properties
3Ease of manufacture
If organic metal halide perovskite is used as resistive switching layer, then ease of manufacture is improved, but on-off resistance ratio deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters of the perovskite, specifically the ratio of phenylethylammonium to CsPbI3, to achieve the desired on-off resistance ratio while maintaining solution-processability and room-temperature stability
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 achieves high on-off resistance ratio, stability at room temperature, and flexibility, enabling continuous switching over 200 cycles with reduced power consumption and environmental impact by using lead-free perovskite materials.
Implementation Method 1
the A′ has an asymmetric ion distribution which may be rotated by an applied electric field
Data Source
AI summary
Provided is a resistive-switching memory containing a positive electrode, a negative electrode and a resistive switching layer provided between the positive electrode and the negative electrode, the resistance of which is switched by an applied voltage, wherein the resistive switching layer contains a compound of the chemical formula (A′)2An−1BnX3n+1,whereinA′ is an ammonium ion having an asymmetric structure and containing a phenyl group, A is a monovalent metal ion and X is a halogen ion,the A′ has an asymmetric ion distribution which may be rotated by an applied electric field, andn is a value between 1 and ∞.