Perovskite solar cell… Expect to lower unit price
International journal’Nature’ published on the 5th
![Perovskite solar cell developed by researchers [사진=울산과학기술원 제공]](https://i0.wp.com/img.hankyung.com/photo/202104/01.25961757.1.jpg?w=560&ssl=1)
Perovskite solar cell developed by researchers [사진=울산과학기술원 제공]
Researchers at the Ulsan Institute of Science and Technology (UNIST) and the Korea Institute of Energy Research announced on the 6th that the’Perovskite’ solar cell has achieved the world’s highest efficiency.
UNIST Prof. Jin-young Kim’s team and Dr. Dong-Seok Kim’s research team at the Korea Institute of Energy Research together with researchers at the Lausanne Institute of Technology (EPFL) in Switzerland developed a perovskite solar cell with an efficiency of 25.6% converting sunlight into electricity. According to the joint research team, this number is the highest among the perovskite solar cell efficiencies that have been formally reported in the paper.
Perovskite is a substance that has a regular three-dimensional structure by combining one anion and two cations, and it is easy and inexpensive to synthesize. For this reason, perovskite solar cells are expected to significantly lower the cost of solar power generation.
However, the efficiency of solar cells using this material is less than that of commercial silicon solar cells, and durability is also poor. The joint research team succeeded in improving battery efficiency and durability by replacing some of the anions that make up perovskite (solution content of 2%) with a material called’formate’.
The formate helps the regular three-dimensional structure inside the perovskite material to grow firmly, because the formate interacts with metal cations to strengthen the bonding force.
If you use a material that has a three-dimensional structure and grows well, the battery efficiency is high. In fact, the research team explained that the efficiency improved by more than 10% compared to the perovskite cell without the formate added.
A joint research team that broke the world record of perovskite solar cell efficiency (from left to right in the back row, UNIST professor Kim Jin-young, KIER researcher Kim Dong-seok, UNIST researcher Yun Young-jin, KIER researcher Kim Min-jin, and Jong-deuk Seo, UNIST researcher)
“We broke the stereotype that only iodine (I-) or bromine (Br-) ions can be used for negative ions,” said Jin-young Kim, a professor of energy and chemical engineering at UNIST. Explained.
Korea Institute of Energy Research, Kim Dong-seok (Director of Ulsan Next-Generation Battery Research and Development Center), Ph. Dr. Dong-Seok Kim said, “By designing and manufacturing a solar cell with a structure that can maximize efficiency with the developed material, we have secured a high 25.2% official record.” I expected it.”
The first author, Dr. Jae-Gi Jeong (currently at 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.”
The results of this study were published in the renowned international academic journal’Nature’ on the 5th.
Reporter Kang Kyung-joo [email protected]
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