Switchable Perovskite Photovoltaic Devices
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Solution Overview
Problem
Current photovoltaic devices and chromic materials lack the ability to reversibly switch between transparent and opaque states or colors in response to environmental conditions such as temperature, humidity, or electric fields, limiting their applications in smart windows and energy harvesting.
Innovation Solution
A composition comprising a scaffold with a mixture of metal halide perovskite and a switching molecule, which allows the perovskite to reversibly switch between different crystalline forms and states, enabling reversible changes in transparency and color by controlling the presence of a switching molecule like water or an additive within the scaffold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photovoltaic devices use traditional opaque structures to maximize energy harvesting, then energy conversion efficiency is improved, but transparency and aesthetic appeal deteriorate
Solution Approach 1:
The photovoltaic device incorporates a perovskite layer that can dynamically change its optical properties between transparent and opaque states in response to environmental stimuli such as temperature, humidity, or electric fields. This dynamic switching capability allows the device to adapt its transparency while maintaining photovoltaic functionality, resolving the contradiction between energy harvesting efficiency and aesthetic appeal.
Solution Approach 2:
The invention utilizes changes in physical parameters (temperature, humidity, electric field) to induce phase transitions in the perovskite material, transforming it between different crystalline forms with distinct optical properties. This parameter-driven transformation enables the device to switch between transparent and opaque states, simultaneously satisfying both energy harvesting and aesthetic requirements.
2Illumination intensity
If photovoltaic devices are made transparent to maintain aesthetic appeal, then transparency is improved, but energy harvesting capability deteriorates
Solution Approach 1:
The perovskite-based photovoltaic device dynamically adjusts its optical properties based on environmental conditions, being transparent when aesthetic appeal is prioritized and opaque when energy harvesting is needed. This dynamic adaptation resolves the contradiction by allowing the device to optimize both transparency and energy harvesting capability at different times rather than compromising either permanently.
Solution Approach 2:
The invention exploits phase transitions of the perovskite material between different crystalline forms (e.g., black phase and yellow phase) that have fundamentally different optical absorption properties. The material transitions to the light-absorbing black phase for energy harvesting and to the transparent yellow phase for aesthetic applications, effectively resolving the contradiction between transparency and energy harvesting capability.
3Adaptability or versatility
If chromic materials are designed to switch between transparent and opaque states, then aesthetic functionality is improved, but photovoltaic performance deteriorates
Solution Approach 1:
The perovskite material serves multiple functions simultaneously: it acts as both the active photovoltaic layer for energy conversion and the chromic switching material for aesthetic control. This multi-functionality eliminates the need for separate chromic coating layers that would compromise photovoltaic performance, as the perovskite itself provides both energy harvesting and optical switching capabilities.
Solution Approach 2:
The invention employs composite perovskite structures with controlled morphology and composition that exhibit both photovoltaic activity and switchable optical properties. The composite nature of the perovskite material, potentially combining different phases or compositions, enables simultaneous achievement of aesthetic functionality and photovoltaic performance without the trade-offs associated with traditional separate-layer designs.
4Reliability
If perovskite material is used to achieve reversible switching between crystalline forms, then reversibility and durability are improved, but device complexity increases
Solution Approach 1:
The perovskite material autonomously switches between crystalline phases in response to environmental stimuli without requiring complex external control systems. The material's inherent phase transition properties enable self-driven switching behavior, eliminating the need for additional actuators, sensors, or control electronics, thereby achieving high reversibility while maintaining simple device architecture.
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 enables photovoltaic devices to dynamically adjust their transparency and color in response to environmental conditions, enhancing their functionality in applications like smart windows and improving energy harvesting efficiency.
Implementation Method 1
the perovskite may reversibly switch between a first crystalline form having a first network dimensionality and a second crystalline form having a second network dimensionality
Implementation Method 2
the perovskite-containing composition may reversibly switch between a first state having a first transparency and/or a first color and a second state having a second transparency and/or a second color
Implementation Method 3
the transferring results in the reversible switching of a perovskite of the perovskite-containing composition between a first crystalline form and a second crystalline form
Data Source
AI summary
The present disclosure relates to a composition that includes a scaffold having an internal space and a mixture positioned within the space, where the mixture includes a first phase having a metal halide perovskite and a second phase including at least one of a perovskite precursor and/or a switching molecule, the composition is capable of reversibly switching between a first state having at least one of a first transparency and/or a first color and a second state having at least one of a second transparency and/or a second color.