A research team, led by Professor Hyesung Park from the Department of Materials Science and Engineering at UNIST, has successfully fabricated potentially high-efficiency, stable and scalable perovskite solar cells (PSCs) via a vacuum deposition, a method of making organic light emitters. display devices (OLED). Such a method is also advantageous for the mass production of batteries, which should further accelerate the commercialization of PSCs, according to the research team.
In this study, the research team demonstrated highly efficient and stable PSCs with a vacuum-treated Ruddlesden-Popper (RP) phase perovskite passivation layer. By controlling the perovskite deposition rate in the RP phase, which directly influenced its crystallographic orientation, the research team succeeded in obtaining a highly ordered 2D perovskite passivation layer. The 2D perovskite layer passived bulk perovskite defects and promoted charge transport efficiency in the PSC. As a result, BABr(V) inverted PSC achieved a champion PCE of 21.4% in the resulting device with exceptional humidity and thermal stability. This number is by far the highest ever achieved for PSCs formed by vacuum deposition. Additionally, it has shown improved long-term operational stability, such as maintaining 62% of its initial PCE (average) when operated for 1,000 hours under 60-70% relative humidity at room temperature. , even without device encapsulation.
“Our findings offer a new perspective to further improve the performance of PSCs by attenuating non-radiative recombination pathways in perovskites,” the research team noted.
This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (MSIT).
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Material provided by Ulsan National Institute of Science and Technology (UNIST). Original written by JooHyeon Heo. Note: Content may be edited for style and length.
- Yunseong Choi, Donghwan Koo, Gyujeong Jeong, Ungsoo Kim, Hyungmin Kim, Fuzhi Huang, Hyesung Park. A vertically oriented two-dimensional Ruddlesden–Popper phase perovskite passivation layer for efficient and stable inverted perovskite solar cells. Energy and Environmental Sciences, 2022; 15(8):3369 DOI:10.1039/D2EE00759B
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Ulsan National Institute of Science and Technology (UNIST). “Solar Technology Breakthrough: Scalable Perovskite Solar Cells.” CNET. CNET, October 20, 2022.
Ulsan National Institute of Science and Technology (UNIST). (2022, October 20). Solar Technology Breakthrough: Scalable Perovskite Solar Cells. ScienceDaily. Retrieved October 20, 2022, from www.CNET.com/releases/2022/10/221020083418.htm
Ulsan National Institute of Science and Technology (UNIST). “Solar Technology Breakthrough: Scalable Perovskite Solar Cells.” CNET. www.CNET.com/releases/2022/10/221020083418.htm (Accessed October 20, 2022).