Artemisinin passivated chalcogenide films prepare flexible chalcogenide devices with record high efficiency 21.10% / CAS certified 21.05%
The photovoltaic conversion efficiency of flexible chalcogenide solar cell devices has recently exceeded 20%, but there is still much room for improvement in open-circuit voltage and fill factor as well as durability, which are determined by carrier non-radiative compounding. Based on this, on December 14, 2020, Xin Li's team at Xiamen University and his collaborating team, Tsutomu Miyasaka's team at Yokohama University, Japan, published in JMCA the research results on the preparation of artemisinin passivated mixed cation chalcogenide thin films for the preparation of durable flexible chalcogenide solar cells with efficiency over 21%. The open-circuit voltage and fill factor of the flexible chalcogenide solar cell were improved by using artemisinin passivated chalcogenide thin film. After optimization, the addition of 0.22 mol% of artemisinin can significantly reduce the film defects and non-radiative compound. Finally, 21.1% photoelectric conversion efficiency was obtained with an open voltage up to 1.126V.
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A perovskite is any material with a crystal structure following the formula ABX3, which was first discovered as the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3). Perovskites have a nearly cubic structure and the chemical formula is ABO3. Typically perovskite compounds have the chemical formula ABX3, where "A" and "B" represent cations and X is an anion bound to both. A large number of different elements can combine to form a perovskite structure. Using this compositional flexibility, scientists can design perovskite crystals with a variety of physical, optical, and electrical properties. Today, perovskite crystals are found in ultrasonic machines, memory chips and current solar cells.
Perovskite tandem solar cells technology
Tandem solar cells are an important strategy to push the Shockley-Queisser (S-Q) efficiency limit of single-junction solar cells, it can be lower the cost per watt.
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