University of Kashan Journal of Nanostructures 2251-7871 13 2 2023 04 01 Stable Perovskite Solar Cells Resist to Water without Encapsulation by P-Type Si Nws as Hole Collection Layers 341 352 113874 10.22052/JNS.2023.02.003 EN Karwan M. Rahman Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Omid Amiri Department of Chemistry, University of raparin, Kurdistan region, Iraq Karim A. Younis Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Muhammad H. Khalil Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Amir Mahyar Azhdarpour Applied Geological Research Center of Iran, Karaj, Iran Mohsen Saadat Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran Mohahmmed A. Jamal Department of Petroleum and Mining Engineering, Faculty of Engineering, Tishk International University, Erbil, Iraq Nabaz A. Abdulrahman Department of Petroleum and Mining Engineering, Faculty of Engineering, Tishk International University, Erbil, Iraq Savana J. Ismael Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Kuestan A. Ibrahim Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Sangar S Ahmed Chemistry Department, College of Science, Salahaddin University, Kirkuk Road, Erbil, Kurdistan Region, 44001, Iraq Journal Article 2023 05 22 In the present work we introduce p-type Si Nano wires (Si NWS) as a hole transport material. As is well known, CH3NH3PbI3 are extremely sensitive to moisture in air but p-type Si Nano wires could protect it from moisture and water. Highly stable CH3NH3PbI3 perovskite absorber with the grain size up to 2 µm was prepared by dip coating method. The cell based on this stable perovskite absorber film achieves a high power conversion efficiency of 21.1%. CH3NH3PbI3 perovskite absorber shows very high stability, it even was stable after washing with water without any encapsulation. We believe that this great stability comes from our new hole CH3NH3PbI3 materials. In this work p-type Si NWs are used as HTM which lead to stabilized CH3NH3PbI3 perovskite absorber even under direct flow of water. Degradation of CH3NH3PbI3 perovskite absorber on mesoporous TiO2 (it was deposited on TiO2 by same method and condition) was studied to approve this hypothesis that stability comes from new HTM. CH3NH3PbI3 perovskite absorber on mesoporous TiO2 was completely degraded after 7 dayss while CH3NH3PbI3 on Si NWs as HTM was quite stable for 50 days. This stability achieved whilst it was washed with water after 41 days (see video in supporting information). XRD and Pl were used to monitoring degradation of perovskite absorber layer over the time. The results provide an important facile approach to fabricate high-efficiency, stable and large area perovskite solar cell/module which accelerate the time to market. https://jns.kashanu.ac.ir/article_113874_4c5f35800a773fd7d58a3bc956309e2d.pdf