Thermochromic Perovskite Coating for Humidity-Stable Smart Windows
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Solution Overview
Problem
Existing thermochromic perovskite windows suffer from degradation due to excessive water exposure, leading to optical haze, blurry views, and lead leakage, while existing protection methods either compromise optical performance or transition properties.
Innovation Solution
A composite material comprising a thermochromic perovskite layer, an antireflection layer of organic or inorganic polymer, and a hydrophobic layer to protect against excessive water contact, maintaining optical clarity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If T-Perovskites are protected by sealing in a double-glazed window, then durability against water is improved, but assembly difficulty increases and leakage risk arises
Solution Approach 1:
The patent applies a thin film protection layer comprising a lower layer and an upper layer directly on the T-Perovskite surface. The lower layer provides water vapor barrier function while the upper layer provides scratch resistance and hydrophobicity. This thin film structure avoids the complexity of double-glazed window sealing while maintaining durability against water.
2Reliability
If T-Perovskites are covered with a protection layer, then durability is improved, but water vapor supply for color switching is insufficient
Solution Approach 1:
The lower layer of the protection film is designed with controlled porosity or specific permeability characteristics that allow water vapor to pass through to enable the hydration-dehydration reaction for color switching, while still providing sufficient barrier function against excessive water contact. This resolves the contradiction between protection and functionality.
3Stability of the object's composition
If the dimensions of T-Perovskite are reduced to 2D, then stability is improved, but transition temperature increases and transition time becomes too long
Solution Approach 1:
The patent optimizes the dimensional parameters of T-Perovskite, specifically controlling the thickness and morphology to maintain a three-dimensional structure with optimal dimensions. This allows the material to retain room temperature transition characteristics and fast transition speed while achieving sufficient stability through the protection film.
4Illumination intensity
If excessive water contacts T-Perovskites, then thermochromic effect is enhanced, but optical haze increases and lead leakage occurs
Solution Approach 1:
The protection film acts as an intermediary between water and T-Perovskite. It allows controlled water vapor interaction to maintain thermochromic functionality while preventing excessive water contact that would cause optical haze and lead leakage. The film mediates the water-T-Perovskite interaction to achieve beneficial effects without harmful consequences.
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 composite material enhances durability and reduces lead leakage, maintaining solar modulation ability and optical performance under humid conditions, with a decay rate 37 times lower than pristine perovskites.
Implementation Method 1
a third layer of hydrophobic material deposited on the second layer
Implementation Method 2
a second layer of antireflection material comprising an organic or inorganic polymer deposited on the first layer
Implementation Method 3
a first layer of thermochromic perovskite; the halide perovskite-based compound is reversibly changed to ABX3 in response to a temperature change
Data Source
AI summary
A composite material comprising a first layer of thermochromic perovskite; a second layer of antireflection material including an organic or inorganic polymer deposited on the first layer; and a third layer of hydrophobic material deposited on the second layer. A method for preparing the composite material is also addressed.