Flexible Perovskite Solar Cell Layout for Bending Stability
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Solution Overview
Problem
Current perovskite solar cells on flexible substrates face limitations in power conversion efficiency due to the need for high-temperature annealing, mechanical weakness, and degradation from repeated bending, as well as issues with hysteresis and aging from UV light and humidity.
Innovation Solution
A perovskite solar cell configuration using a flexible metal substrate with a metal doped TiO2 layer and a transparent electrode layer with a dielectric/metal/dielectric structure, which allows for high-temperature processing, enhanced mechanical flexibility, and reduced hysteresis, while also protecting the perovskite layer from UV light and humidity through top-illumination and passivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature annealing is used to obtain highly crystalline TiO2 for high efficiency, then power conversion efficiency is improved, but flexibility and mechanical strength deteriorate due to substrate degradation
Solution Approach 1:
The patent inverts the conventional substrate position by placing the flexible polymer substrate at the rear side (back contact) rather than the front. This allows the front surface to use rigid TCO substrates with TiO2 ETL for high efficiency, while the flexible substrate serves as a mechanically robust rear support that can withstand high-temperature processing without degrading the active perovskite layer.
Solution Approach 2:
The patent separates the functional requirements into different spatial dimensions: the front surface optimizes for optical and electronic performance with rigid substrates and crystalline TiO2, while the rear surface provides mechanical flexibility and thermal stability through the polymer substrate positioned at the back contact interface.
2Strength
If conventional substrate configurations are used to achieve flexibility, then mechanical flexibility is improved, but power conversion efficiency deteriorates due to inability to perform high-temperature annealing
Solution Approach 1:
The patent divides the solar cell into two distinct surfaces with different substrate types: a rigid front surface with TCO substrate and crystalline TiO2 for high efficiency, and a flexible rear surface with polymer substrate for mechanical flexibility. This segmentation allows each surface to be optimized for its primary function without compromise.
Solution Approach 2:
The patent resolves the contradiction by moving the flexible substrate to the rear dimension rather than using it at the front. This spatial repositioning allows the front surface to achieve high crystallinity and efficiency through high-temperature processing, while the rear flexible substrate provides mechanical compliance for wearable applications.
3Strength
If repeated bending is performed to test flexibility, then mechanical flexibility is demonstrated, but device stability deteriorates due to crack propagation in the ITO layer
Solution Approach 1:
The patent inverts the substrate arrangement so that the flexible polymer substrate is positioned at the rear contact rather than the front. This prevents bending-induced cracks in the ITO layer by eliminating the conflict between thick ITO and flexible substrate, as the ITO is now deposited on a rigid TCO substrate that does not crack during bending.
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 configuration achieves improved power conversion efficiency, stability under repeated bending, and enhanced durability against UV light and humidity, making it suitable for flexible and wearable electronics applications.
Implementation Method 1
a perovskite layer, and a transparent electrode layer including a dielectric/metal/dielectric structure
Implementation Method 2
the transparent electrode layer enables illumination of the perovskite layer through the transparent electrode layer
Implementation Method 3
A perovskite solar cell configuration using a flexible metal substrate with a metal doped TiO2 layer
Implementation Method 4
organic-inorganic perovskite semiconductors, such as halide perovskite (CH3NH3PbX3, X═halogen ions), have been found to be an excellent light absorber
Data Source
AI summary
Various perovskite solar cell embodiments include a flexible metal substrate (e.g., including a metal doped TiO2 layer), a perovskite layer, and a transparent electrode layer (e.g., including a dielectric/metal/dielectric structure), wherein the perovskite layer is provided between the flexible metal substrate and the transparent electrode layer. Also, various tandem solar cell embodiments including a perovskite solar cell and either a quantum dot solar cell, and organic solar cell or a thin film solar cell.