Perovskite Solar Cell Interface Layer for Lower Hetero-Interface Loss
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Solution Overview
Problem
Perovskite solar cells face challenges in improving conversion efficiency due to interface losses at hetero-interfaces, which are difficult to reduce compared to homo-interfaces in crystalline solar cells.
Innovation Solution
Incorporating a semiconductor layer with a compound containing Na, Zn, and O, specifically Na2Zn2O3, between the photoelectric conversion layer and electrodes, where the atomic ratio of Na to Zn is greater than or equal to 0.769, to minimize deep defect levels and suppress interface losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a perovskite solar cell uses conventional electron transport materials like TiO2 or doped ZnO, then the device structure is simple and easy to manufacture, but interface losses occur at hetero-interfaces reducing conversion efficiency
Solution Approach 1:
The patent introduces an intermediate semiconductor layer containing Na2Zn2O3 compound between the photoelectric conversion layer and the electrode. This intermediary layer serves as a buffer that reduces interface losses by minimizing deep defect levels at the hetero-interface, thereby improving voltage values and conversion efficiency without fundamentally changing the overall device architecture
Solution Approach 2:
The patent employs a composite material approach by using a semiconductor layer containing a specific compound with Na, Zn, and O elements (Na2Zn2O3) with a controlled atomic ratio. This composite semiconductor layer combines the benefits of reduced interface losses with maintained structural simplicity, achieving high conversion efficiency through material composition optimization rather than structural complexity
2Reliability
If the atomic ratio of Na to Zn in the semiconductor layer is not optimized, then the manufacturing process is simpler, but deep defect levels form at the interface reducing voltage values
Solution Approach 1:
The patent applies parameter changes by optimizing the atomic ratio of Na to Zn in the semiconductor layer to be greater than or equal to 0.769. This specific parameter optimization prevents the formation of deep defect levels at the interface, thereby improving voltage values and conversion efficiency. The parameter change is implemented through controlled composition ratios during the manufacturing process
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 configuration enhances the voltage value and conversion efficiency of perovskite solar cells, recognized as an improvement in open-circuit voltage, and can be applied to CIS-based and organic solar cells as well.
Implementation Method 1
Incorporating a semiconductor layer with a compound containing Na, Zn, and O, specifically Na2Zn2O3, between the photoelectric conversion layer and electrodes, where the atomic ratio of Na to Zn is greater than or equal to 0.769, to minimize deep defect levels and suppress interface losses
Implementation Method 2
a photoelectric conversion layer located between the first electrode and the second electrode; in which at least one selected from the group consisting of the first electrode and the second electrode is translucent
Data Source
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AI summary
The present disclosure provides a technique for increasing the conversion efficiency of a solar cell. A solar cell according to the present disclosure includes a first electrode, a second electrode, a photoelectric conversion layer located between the first electrode and the second electrode, and a semiconductor layer located between the first electrode and the photoelectric conversion layer, in which at least one selected from the group consisting of the first electrode and the second electrode is translucent, and the semiconductor layer contains a compound containing Na, Zn, and O.