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Enhancing The Stability Of Perovskite Solar Cells With Ultrathin Alumina Protective Layer

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Jan 17, 2017

Recently, researchers at Technische Universiteit Eindhoven in Holland and ECN Research Institute found that alumina layer can prevent add a few nanometer perovskite type solar cell from affected by humidity, this point remains a major obstacle to the commercial application of perovskite solar cell. The study was published in the journal energy and environmental sciences. Surprisingly, the battery capacity has increased by 3%.        


Perovskite solar cells have experienced rapid development in recent years. This mineral has perovskite oxide and titanium calcium (CaTiO 3) the same crystal structure, this type of solar cell production capacity increased to 22% in just a few years.          


However, a drawback of this temporary perovskite battery is destructive effect of humidity: water vapor and perovskite crystals in the air reacts, resulting in reduced yield. This instability is a stumbling block to commercialization.          


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


Although alumina with conductive insulation, but the thickness is limited to 1 nm or more thin, still can be used as a buffer layer between the semiconductor perovskite and conductive contact, then charge carriers will power transmission to the insulator layer.          


The researchers compared the cells with the alumina layer and the cells that did not take the alumina layer. In the exposure to humid air after two months, containing alumina layer battery capacity can reach the original production capacity of 60%-70%, while the traditional battery is only 12%.          


In addition, the battery capacity has been increased from 15% to 18%, which is an additional receipt of the results of this study.          


Previous studies usually try to install alumina layer outside the battery, but the protective alumina layer is not installed on the external battery. Both sides of this solar cell can add many kinds of materials, perovskite can obtain the maximum transmission rate, to ensure the best utilization rate of current. solar batteries like: