Tin Perovskite Silicon Tandem Solar Cells
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Solution Overview
Problem
The challenge in solar cell technology is to achieve long-term stability and efficient energy conversion while addressing the toxicity of lead-based perovskite materials and the complexity of silicon semiconductor connections, particularly in tandem solar cells, which are essential for cost-effective and environmentally friendly energy production.
Innovation Solution
The development of a non-toxic tin perovskite/silicon thin-film tandem solar cell structure, where a tin-based perovskite layer is formed on a crystalline silicon thin-film, utilizing a eutectic alloy and oxidized metal layers to create a tunnel recombination junction, facilitating efficient energy transfer and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lead-based perovskite materials are used to achieve high conversion efficiency, then power conversion efficiency is improved, but toxicity increases
Solution Approach 1:
The patent changes the chemical composition parameter of perovskite materials by replacing toxic lead (Pb) with non-toxic alternatives such as tin (Sn), germanium (Ge), or bismuth (Bi) while maintaining the ABX3 crystal structure. This substitution maintains the perovskite's ability to absorb light and convert it to electricity while eliminating the toxicity issue, thus resolving the contradiction between efficiency and environmental safety
Solution Approach 2:
The patent employs composite material structures by combining perovskite layers with other semiconductor materials in tandem solar cell configurations. This allows the perovskite to handle high-energy photons while the underlying silicon or other semiconductors handle lower-energy photons, achieving high overall efficiency without requiring high lead content, thereby reducing toxicity while maintaining power conversion efficiency
2Reliability
If silicon wafer-based technologies are used to ensure stability, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive, energy-intensive silicon wafer manufacturing with cheaper thin-film deposition techniques. By using solution-processing methods, vapor deposition, or spray coating to create thin perovskite films on flexible substrates, the manufacturing cost is dramatically reduced while the resulting devices achieve comparable or superior stability through optimized film structures and encapsulation
Solution Approach 2:
The patent changes the manufacturing parameters from high-temperature, high-vacuum silicon wafer processes to low-temperature, atmospheric-pressure thin-film deposition. This allows production on flexible, inexpensive substrates like plastic or thin glass, reducing material costs and energy consumption while maintaining device reliability through careful control of film quality and encapsulation
3Power
If perovskite films are made highly reactive to improve light absorption, then power conversion efficiency is improved, but stability deteriorates
Solution Approach 1:
The patent introduces intermediary layers between the perovskite active layer and the surrounding environment (electrodes, encapsulation, moisture barriers). These intermediary transport layers and encapsulation structures protect the highly reactive perovskite from degradation by water, oxygen, and electrical stress, thereby maintaining both high light absorption efficiency and long-term compositional stability
Solution Approach 2:
The patent optimizes the chemical composition parameters of perovskite films by adjusting the ratio of organic to inorganic components, selecting specific halide compositions (iodide, bromide, chloride), and controlling crystallization conditions. These parameter changes enhance the inherent stability of the perovskite structure while preserving its light-absorbing properties, reducing reactivity without sacrificing efficiency
4Power
If complex silicon semiconductor connections are used to achieve efficient energy transfer, then power conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex silicon semiconductor connection structures by using simple, direct contact between perovskite layers and electrode materials. The perovskite's own charge transport properties and simple layer-by-layer structure replace the need for complex silicon junctions, achieving efficient energy transfer through material selection rather than structural complexity
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
This approach enables high-efficiency solar cells with improved stability, reduced toxicity, and lower production costs, potentially achieving efficiencies up to 40-45% and simplifying the manufacturing process by using lower temperatures and less expensive substrates, thus addressing the limitations of traditional silicon wafer-based technologies.
Implementation Method 1
utilizing a eutectic alloy and oxidized metal layers to create a tunnel recombination junction
Implementation Method 2
tin-based perovskite/silicon thin-film tandem solar cell structure... facilitating efficient energy transfer
Data Source
AI summary
A method of growing a III-V semiconductor compound film for a semiconductor device including the steps of depositing a textured oxide buffer layer on an inexpensive substrate, depositing a metal-inorganic film from a eutectic alloy on the buffer layer, the metal being a component of a III-V compound and forming a layer on the inorganic film on which additional elements from the III-V compound are added, forming a top layer of a tandem solar cell.