Perovskite Cell Reflective Layer for Light Utilization and Stability
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Solution Overview
Problem
Perovskite batteries exhibit relatively low photoelectric conversion efficiency due to insufficient light utilization and stability issues.
Innovation Solution
Incorporating a first functional layer capable of reflecting light back into the perovskite layer and a second functional layer to block iodine ion migration, along with a roughened perovskite surface, to enhance light absorption and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a perovskite battery uses a simple structure without light reflection layers, then the device complexity is low, but the photoelectric conversion efficiency is insufficient
Solution Approach 1:
The perovskite battery is divided into multiple functional layers including a light reflection layer positioned between the perovskite layer and the electrode. This segmentation allows each layer to perform its specific function optimally, with the reflection layer specifically tasked with redirecting unabsorbed light back into the perovskite layer to enhance photoelectric conversion efficiency without significantly increasing overall structural complexity.
2Manufacturing precision
If the perovskite layer has a smooth surface, then the manufacturing precision is high, but the light absorption capability is insufficient
Solution Approach 1:
The perovskite layer surface is designed with a roughened texture featuring curved and undulating surfaces rather than a flat plane. This curvature increases the optical path length of incident light within the perovskite layer, enhancing light absorption capability. The rough surface structure allows light to bounce multiple times within the layer, improving photoelectric conversion while remaining compatible with manufacturing processes.
3Device complexity
If the perovskite battery lacks protective functional layers, then the device complexity is low, but the stability against environmental factors is poor
Solution Approach 1:
Protective functional layers are introduced as intermediary elements between the perovskite layer and the external environment. These layers act as mediators that prevent direct contact between the sensitive perovskite material and harmful environmental factors such as moisture and oxygen, thereby enhancing stability and reliability without significantly increasing device complexity.
4Device complexity
If light passes through the perovskite layer without reflection, then the device structure is simple, but the light utilization efficiency is low
Solution Approach 1:
A light reflection layer is positioned behind the perovskite layer to create a feedback mechanism for light. Unabsorbed light that passes through the perovskite layer is reflected back by this layer, providing a second opportunity for the perovskite material to absorb the light and generate electricity. This feedback loop improves light utilization efficiency while maintaining relatively simple device structure.
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
Improves light utilization efficiency and long-term stability by reintroducing unabsorbed light and preventing ion migration, resulting in enhanced photoelectric conversion efficiency and reduced charge accumulation.
Implementation Method 1
a first functional layer located on a side of the perovskite layer facing away from the first electrode layer and on a side of the second electrode layer in a thickness direction, the first functional layer being capable of reflecting at least a portion of light incident from the first electrode layer and transmitted through the perovskite layer back to the perovskite layer
Implementation Method 2
perovskite batteries possess advantages such as high conversion efficiency
Data Source
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AI summary
This application relates to the technical field of solar cells, specifically to a perovskite battery and a preparation method thereof, and an electric apparatus. The perovskite battery includes: a first electrode layer configured to be an electrode layer for light incidence in the perovskite battery; a first carrier transport layer disposed on the first electrode layer, the first carrier transport layer being one of a hole transport layer and an electron transport layer; a perovskite layer disposed on a side of the first carrier transport layer facing away from the first electrode layer; a second electrode layer located on a side of the perovskite layer facing away from the first electrode layer; and a first functional layer located on a side of the perovskite layer facing away from the first carrier transport layer and on a side of the second electrode layer in a thickness direction, where the first functional layer is capable of reflecting at least a portion of light incident from the first electrode layer and transmitted through the perovskite layer back to the perovskite layer. This application achieves high light utilization efficiency and enhances the photoelectric conversion efficiency of the perovskite battery.