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[Th1-P51-46]Enhancing UV stability in carbon-based cesium/formamidinium perovskite solar cells with an easily accessible down-conversion 2-hydroxyphenylbenzimidazole derivatives

*Kumaree Thongimboon1, Watcharapong Pudkon1, Theerapat Arpornrat1, Thanawat Kanlayapattamapong1, Pattama Apichai1, Piyaporn Makming2, Latthaphonh Kythavone2, Panithan Intharawicha4, Natthawat Semakul5, Pongsakorn Kanjanaboos3, Duangmanee Wongratanaphisan1, Pipat Ruankam1 (1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University (Thailand), 2. School of Renewable Energy, Maejo University (Thailand), 3. School of Materials Science and Innovation, Faculty of Science, Mahidol University (Thailand), 4. Faculty of Science, Chiang Mai University (Thailand), 5. Department of Chemistry, Faculty of Science (Thailand))