US researchers have made a new technological breakthrough by developing a perovskite solar cell with a photoelectric conversion efficiency of 24%, the highest reported in its class, and stability. The research was published in the latest issue of the journal Nature.
Perovskite: refers to a class of ceramic oxides whose molecular formula is ABO3; such oxides were first discovered as calcium titanate (CaTiO3) compounds present in perovskite, hence the name. Because such compounds have many structural characteristics, they are widely used and studied in condensed matter physics, so physicists and chemists often refer to them as the ratio (1:1:3) of each compound in their molecular formula. Name "113 Structure". In the form of cubic crystals. The cubic crystals often have stripes of parallel crystal edges, which are the result of poly-lamellar twins when the high-temperature variant is transformed into a low-temperature variant.
Photoelectric conversion efficiency: that is, the incident monochromatic photon-to-electron conversion efficiency (monochromatic incident photon-to-electron conversion efficiency, represented by the abbreviation IPCE), is defined as the number of electrons Ne generated in the internal and external circuits per unit time and the incident monochromatic incident per unit time. The ratio of the number of photons Np.
Scientists improve the efficiency and stability of perovskite solar cells with the help of inverted structure, coupled with surface engineering methods
source: Physicists Organization Network
The research was conducted by scientists from the U.S. Department of Energy's National Renewable Energy Laboratory (NREL), the University of Toledo, the University of Colorado Boulder, and the University of California, San Diego. They explain that a unique architecture enables the new cell to achieve a stable photoelectric conversion efficiency of 24 percent. And, after 2,400 hours of operation at 55°C, the cell still maintained 87% of its original efficiency.
Perovskite refers to a crystal structure known over the past decade for its ability to efficiently capture sunlight and convert it into electricity, and research in perovskite solar cells has largely focused on how to improve its stability.
In the latest study, the scientists used an "inverted" architecture, rather than the "normal" architecture that is currently the most efficient. The difference between the two architectures depends on how the layers are deposited on the glass substrate. "Inverted" perovskite structures are known for their high stability and their ability to be integrated into tandem solar cells. In addition, the NREL team added a new molecule to the surface of perovskite, which reacts with formamidine in perovskite to generate an electric field on the surface of the perovskite layer, improving the efficiency and stability of perovskite solar cells sex.
The research team also reported that the new molecular reactive surface engineering could increase the efficiency of "inverted" architecture cells from less than 23 percent to more than 25 percent, making them "record highs in both efficiency and operational reliability."
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Article source: Science and Technology Daily
