Increased efficiency by finding substitute materials for perovskite materials
Expectation of help in the development of next-generation photoelectric devices such as display (PeLED)
Published a paper in Nature magazine…Certified for power conversion efficiency of 25.21±0.8% by Newport, a certified US
A local research team and a Swiss research team jointly developed a Perovskite solar cell with an efficiency of 25.6% converting sunlight into electricity, which is a hot topic.
It is the world’s highest record in the efficiency of official paper reporting so far.
The results of the joint research by Professor Jinyoung Kim’s team at the Ulsan Institute of Science and Technology (UNIST), Dr. Dongseok Kim’s research team at the Korea Institute of Energy Research, and researchers at the Federal Institute of Technology in Lausanne (EPFL), were published on April 5 in the international scientific journal Nature. UNIST announced on the 6th that it has published’Pseudo-halide Anion Engineering for α-FAPbI3 Perovskite Soalr Cells’.
The efficiency of a’perovskite solar cell’ that is simpler to make and cheaper than a silicon solar cell is determined by the material of the photoactive layer, and the photoactive layer, perovskite, is ABX3 (A: 1 cation, B: metal cation, X: halogen Anion) is an artificially synthesized material having the chemical formula.
In the case of a silicon solar cell, a silicon wafer, which is a thin silicon plate, is used as a photoactive layer. Perovskite solar cells are expected to lower the cost of solar power generation, but the efficiency and safety of materials have been actively researched to improve the solar cell efficiency using this material is still less than that of commercial silicon solar cells and its durability is also poor. Has become.
The co-workers improved efficiency by changing the constituent combinations of perovskite materials into a new approach. It was revealed that the battery efficiency and durability were improved by replacing some of the anions that make up the perovskite with a material called formate (HCOO-).
Formate helps the regular three-dimensional structure inside the perovskite material to grow firmly, because formate interacts with metal cations and strengthens the bonding force. When using a material with excellent crystallinity, the battery efficiency is also high, and the efficiency is improved by more than 10% compared to the perovskite battery without the actual formate.
The structure of the solar cell using the photoactive layer developed by the research team used a mesoscopic structure, and the power conversion efficiency of this cell (the efficiency of converting the solar energy irradiated to the cell to 100 when viewed as 100) is the efficiency currently published in the paper. It recorded 25.6%, the highest efficiency among all. The research team explained that the power conversion efficiency of 25.21±0.8% was also certified by Newport, an accredited certification body in the United States.
Professor Kim Jin-young of the Department of Energy and Chemical Engineering at UNIST said, “We broke the stereotype that only iodine (I-) or bromine (Br-) ions can be used in the place of anions.” said.
Dr. Dongseok Kim of Korea Institute of Energy Research, who has conducted joint research with Prof. Jinyoung Kim’s research team since 2013, and was in charge of producing the battery for this study, said, “We have secured a high 25.2% accredited record, and it will be advantageous for commercialization as it is possible to make batteries of the same quality. I expected it.
UNIST Dr. Jae-Gi Jeong (first author, current Lausanne Institute of Technology) said, “It is of great academic significance in that it was the first in the world to discover that formate can interact with surrounding elements at the site of anions in perovskite crystals.” “The research suggests a new direction for the study of perovskite materials.”
This material developed by the research team can be used to research perovskite light-emitting diodes, detectors (sensors) and thermoelectric devices by helping to form a bulk structure. It is a solution process used when coating flexible films. If manufactured, it can be applied to wearable devices that bend and bend. Compared to existing inorganic electronic devices such as silicon, the process is simple and manufacturing cost is low.
In the future, it is expected to play a big role in various compositions of perovskite by being used as a next-generation solar cell material.
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