Perovskite Solar Cell Bandgap Gradient for Thin-Layer Light Transmission
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Solution Overview
Problem
Perovskite solar cells face challenges in efficiently transmitting long-wavelength light while maintaining a thin thickness to avoid reducing current density.
Innovation Solution
A perovskite solar cell design with a light absorption layer having varying optical band gaps and halogen element compositions across its surfaces, allowing for efficient light transmission and increased current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the perovskite solar cell is increased to increase current density, then the current density increases, but the transmission of long-wavelength light decreases
Solution Approach 1:
The patent applies local quality by creating a gradient structure where the optical band gap varies across the thickness of the perovskite layer. The inner portion has a first optical band gap while the outer surface has a second optical band gap that is smaller, allowing different regions to optimize for different functions: current generation and light transmission
Solution Approach 2:
The patent changes the optical band gap parameter across the perovskite layer thickness. By controlling the composition gradient (e.g., halogen content variation) through the layer, the optical band gap transitions from the inner portion to the outer surface, enabling simultaneous optimization of current density and light transmission
2Use of energy by moving object
If the thickness of the perovskite solar cell is decreased to improve long-wavelength light transmission, then the light transmission increases, but the current density decreases
Solution Approach 1:
The patent creates functional differentiation within the perovskite layer by establishing regions with different optical properties. The outer surface region is optimized for light transmission with a smaller optical band gap, while the inner portion maintains a larger optical band gap for effective light absorption and current generation
Solution Approach 2:
The patent effectively creates a composite structure within the perovskite layer by varying the composition (e.g., mixing different halogen elements like iodine and bromine in varying ratios) across the thickness, resulting in a gradient material with spatially varying optical band gap properties
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 design enables thin perovskite solar cells to enhance efficiency by optimizing light absorption and transmission, while a deposition process allows for easy adjustment of halogen element content.
Implementation Method 1
an optical band gap of an inner portion of the light absorption layer is constant or decreases toward the other surface from the one surface
Data Source
AI summary
The present invention relates to a solar cell, including a perovskite solar cell including a light absorption layer including a perovskite compound and a conductive charge transporting layer included in at least one surface of one surface and the other surface of the light absorption layer, wherein the one surface of the light absorption layer is disposed closer to an incident surface for sunlight than the other surface of the light absorption layer, an optical band gap of an inner portion of the light absorption layer is constant or decreases toward the other surface from the one surface, and an optical band gap of the one surface of the light absorption layer is greater than an optical band gap of the other surface of the light absorption layer, and a method of manufacturing the solar cell.