Perovskite Tandem Solar Cell Layout for Efficient Two-Terminal Stacking
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Solution Overview
Problem
Perovskite tandem solar cells face challenges in achieving high photoelectric conversion efficiency while maintaining industrial productivity due to limitations in stacking top and bottom cells with different structures, such as n-i-p and p-i-n configurations, which require specific materials and processing conditions that are not easily compatible.
Innovation Solution
A perovskite tandem solar cell design featuring a top cell with an n-i-p structure and a bottom cell with a p-i-n structure, where the first photoelectric conversion layer includes a perovskite compound with a larger bandgap than the second, allowing for efficient light absorption and conversion without compromising industrial productivity, and the cells are connected in a two-terminal structure to optimize electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple solar cells with different structures (n-i-p and p-i-n configurations) are stacked to form a perovskite tandem solar cell, then photoelectric conversion efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The solar cell is divided into multiple independent photoelectric conversion layers, each with a specific structure (n-i-p or p-i-n configuration), allowing each layer to be optimized for different wavelength ranges while maintaining overall system efficiency
Solution Approach 2:
The patent combines different perovskite compound structures (n-i-p and p-i-n configurations) into a single tandem device, creating a composite photoelectric conversion system that leverages the advantages of each configuration to achieve higher overall efficiency
2Loss of energy
If multiple solar cells with different structures are stacked, then photoelectric conversion efficiency is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent designs the tandem solar cell structure to use common materials and processing conditions across different layers, allowing a single manufacturing process to produce multiple photoelectric conversion layers with different configurations, thereby improving ease of manufacture
3Loss of energy
If multiple solar cells with different structures are stacked, then photoelectric conversion efficiency is improved, but productivity decreases
Solution Approach 1:
The patent merges the fabrication processes of multiple solar cells into a single integrated manufacturing step, where different photoelectric conversion layers are formed simultaneously or in sequence within the same production line, thereby maintaining industrial productivity while achieving high efficiency
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 achieves high photoelectric conversion efficiency by optimizing light absorption across a broad spectrum and simplifies industrial production by using a two-terminal structure that reduces complexity and enhances compatibility between layers, thereby improving overall solar cell performance.
Implementation Method 1
Perovskite solar cells use, as a photoelectric conversion material, a perovskite compound... a perovskite compound represented by a chemical formula of CH3NH3PbI3... used as a photoelectric conversion material
Data Source
AI summary
Methods for manufacturing a solar cell that includes a first substrate, a first electrode layer, a first electron transport layer, a first photoelectric conversion layer, a first hole transport layer, a second electrode layer, a third electrode layer, a second electron transport layer, a second photoelectric conversion layer, a second hole transport layer, a fourth electrode layer, and a second substrate that are disposed in the order stated. The first photoelectric conversion layer includes a first perovskite compound, and the second photoelectric conversion layer includes a second perovskite compound. The first perovskite compound has a bandgap greater than a bandgap of the second perovskite compound.