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Alumina Thin Film Could Protect Perovskite Solar Cells

Author: Source: Datetime: 2016-12-11 15:15:18
Researchers at the University of Eindhoven and the ECN Research Institute in the Netherlands have found that the addition of a few nanometers of alumina thin film prevents the perovskite solar powered portable generator cells from being affected by humidity, which is still the commercialization of perovskite solar cells Application of the main obstacles. The results of the study were published in the journal Energy and Environmental Sciences. Surprisingly, the battery capacity also increased by 3%.
Alumina Thin Film Could Protect Perovskite Solar Cells
Perovskite solar cells have undergone rapid development in recent years. Perovskite This mineral has the same crystal structure as calcium titanate oxide (CaTiO 3), and this type of solar cell production capacity has risen to 22% in just a few years.

However, one shortcoming of this temporary perovskite cell is the damaging effect of humidity: water vapor in the air reacts with perovskite crystals, resulting in a decrease in yield. This instability is a stumbling block to commercialization.

The researchers used several alumina atomic layers to cover the perovskite-sensitive layers to prevent performance degradation caused by humidity. The alumina atomic layer is contained within the solar power generator cell, between the perovskite layer and the electrical contact layer. The choice of alumina (Al2O3) is mainly due to its rapid formation on any type of surface.

Although alumina has conductive insulating properties, it can still be used as a buffer layer between the semiconductor perovskite and the conductive contact by limiting its thickness to 1 nm or less, and then the charge carriers transfer the electric power to the insulator Floor.

Researchers will be with the alumina layer of the battery and the battery without the alumina layer were found. After exposure to humid air for two months, the alumina-containing cell capacity reaches 60 to 70 percent of the original capacity, compared to 12 percent for conventional batteries.

In addition, the battery production capacity from 15% to 18%, which is the result of additional research.

Previous studies have generally attempted to install the alumina layer outside the cell, but the protective alumina layer is not mounted outside the cell. So that both sides of the solar cell can add a variety of materials, perovskite layer can get the maximum transmittance to ensure the best current utilization.
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