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Detrimental Effect of Unreacted PbI2 on the Long-Term Stability of Perovskite Solar Cells |
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| Authors: | Ganbaatar Tumen-Ulzii Chuanjiang Qin Dino Klotz Matthew R Leyden Pangpang Wang Morgan Auffray Takashi Fujihara Toshinori Matsushima Jin-Wook Lee Sung-Joon Lee Yang Yang Chihaya Adachi |
| Affiliation: | 1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan
Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan;2. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan;3. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan;4. Institute of Systems, Information Technologies and Nanotechnologies (ISIT), Fukuoka Industry-Academia Symphonicity (FiaS), 4-1 Kyudaishinmachi, Nishi, Fukuoka, 819-0388 Japan;5. Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395 Japan;6. Department of Materials Science and Engineering and California NanoSystems Institute, University of California, Los Angeles, CA, 90095 USA |
| Abstract: | Excess/unreacted lead iodide (PbI2) has been commonly used in perovskite films for the state-of-the-art solar cell applications. However, an understanding of intrinsic degradation mechanisms of perovskite solar cells (PSCs) containing unreacted PbI2 has been still insufficient and, therefore, needs to be clarified for better operational durability. Here, it is shown that degradation of PSCs is hastened by unreacted PbI2 crystals under continuous light illumination. Unreacted PbI2 undergoes photodecomposition under illumination, resulting in the formation of lead and iodine in films. Thus, this photodecomposition of PbI2 is one of the main reasons for accelerated device degradation. Therefore, this work reveals that carefully controlling the formation of unreacted PbI2 crystals in perovskite films is very important to improve device operational stability for diverse opto-electronic applications in the future. |
| Keywords: | perovskite solar cells photolysis of PbI2 stability unreacted PbI2 |