2D Perovskite Quantum Well Film with Pure-Phase Width Control
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Solution Overview
Problem
Existing methods for preparing low-dimensional perovskite materials result in multi-phase mixed multi-quantum wells, failing to achieve a single pure-phase perovskite quantum well, particularly in perovskite films with higher quantum well width distribution.
Innovation Solution
Utilizing an organic proton-type ionic liquid, specifically butylamine acetate ionic liquid (CH3(CH2)3NH3+·CH3COO−), as a solvent to prepare a two-dimensional perovskite pure-phase quantum well structure through a method involving mixing, recrystallization, and spin-coating on a glass substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing amine compound hydriodates and hydrobromides are used to prepare low-dimensional perovskite, then the preparation process can be performed, but the result is a multi-phase mixed multi-quantum well structure instead of a single pure-phase perovskite quantum well
Solution Approach 1:
The patent changes the chemical composition parameters by using protonated amine compounds (RNH3+) instead of traditional amine hydriodates or hydrobromides. This parameter change in the organic cation structure enables the formation of single pure-phase perovskite quantum wells with controlled quantum well widths, resolving the phase purity issue while maintaining preparability.
2Manufacturing precision
If traditional methods are used to prepare perovskite films, then preparation can proceed, but the quantum well width distribution remains uncontrolled and multi-phase mixing occurs
Solution Approach 1:
By changing the organic cation from traditional amine salts to protonated amine compounds with specific alkyl chain lengths (C4-C18), the patent achieves controlled quantum well width distribution. The systematic variation of alkyl chain length provides a straightforward method to control the quantum well structure while maintaining ease of preparation through standard solution processing.
Solution Approach 2:
The patent creates composite perovskite structures with specific organic-inorganic hybrid compositions using protonated amine compounds. These composite materials exhibit single pure-phase characteristics with controlled quantum well widths, achieving both manufacturing precision and ease of manufacture through the unique composite structure.
3Reliability
If existing perovskite preparation methods are employed, then material can be synthesized, but the phase purity remains low with multi-phase mixed structures
Solution Approach 1:
The patent achieves high phase purity by changing the chemical parameter of the organic cation to protonated amine compounds (RNH3+). This parameter change simplifies the preparation process while reliably producing single pure-phase perovskite quantum wells, eliminating the need for complex multi-step purification or control procedures.
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 enables the formation of a pure-phase quantum well structure with high purity (>98%) and controlled quantum well width, offering improved stability, photoelectric efficiency, and suitability for large-area preparation.
Implementation Method 1
The organic proton-type ionic liquid can be used as a new solvent for dissolving the perovskite precursor
Implementation Method 2
a method for preparing a film with a two-dimensional perovskite pure-phase quantum well structure
Implementation Method 3
heating to 65° C. and stirring until dissolved
Implementation Method 4
lowering the temperature to −4° C. for recrystallization
Data Source
AI summary
Disclosed are an organic proton-type ionic liquid, a film with a two-dimensional perovskite pure-phase quantum well structure, a preparation method and use thereof. The organic proton-type ionic liquid has a chemical formula of RNH3+·CH3COO− or RNH3+·RCOO−, where R represents an alkyl group of C4-8 or a phenyl group, preferably, the chemical formula thereof is CH3(CH2)3NH3+·CH3COO−. The organic proton-type ionic liquid can be used to prepare perovskite material, the perovskite film prepared thereby can form a pure-phase single quantum well, with a crystal grain size therein reaching a level of micrometers or even millimeters.