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▲ [12a-N322-4] Air and vacuum exposure of 3D and quasi-2D perovskites
Keywords:electron spectroscopy, perovskite solar cell, quasi-2D perovskite
2D/3D (a thin layer of 2D perovskite formed on top of 3D perovskite) and quasi-2D (introducing a large organic cation into the 3D perovskite) perovskites have attracted considerable attention since it can be a potential candidate to enhance the lifetime of the perovskite solar cells.[1-2] In this regard, surface properties of 3D and quasi-2D perovskites are paramount important for improving solar cell performance. Therefore, it is crucial to examine the surface structure used an efficient experimental way.
Recently we examined surface structure of solution processed MAPbI3 and quasi-2D perovskite film using ultraviolet photoelectron (UPS) and metastable-atom electron (MAES) spectroscopies.[3-4] UPS examines the valence electronic states of materials. MAES extremely sensitive to the outermost surface atoms and only gives the information of the outermost surface.[5]
In this work we investigated the effect of air and vacuum exposure of both pristine 3D and quasi-2D PEA2MAn-1PbnI3n+1 perovskite using the method of UPS and MAES spectroscopies. We found that 3D perovskite degraded to PbI2, and the surface of the quasi-2D perovskite, on the other hand, remain unchanged before and after vacuum/air exposure. The results strongly demonstrated that after the 3D perovskite surface covered with a thin PEA based 2D perovskite (quasi-2D), degradation is ceased in both vacuum and air.
References
[1] I. C. Smith, et al., Angew. Chemie 2014, 126, 11414.
[2] G. Grancini, et al., Nat. Rev. Mater. 2019, 4, 4.
[3] A. Mirzehmet, et al., Adv. Mater. 2021, 33, 2004981.
[4] A. Mirzehmet, et al., Appl. Phys. Express. 2021, 14, 31006.
[5] Y. Harada, et al, Chem. Rev. 1997, 97, 1897.
Recently we examined surface structure of solution processed MAPbI3 and quasi-2D perovskite film using ultraviolet photoelectron (UPS) and metastable-atom electron (MAES) spectroscopies.[3-4] UPS examines the valence electronic states of materials. MAES extremely sensitive to the outermost surface atoms and only gives the information of the outermost surface.[5]
In this work we investigated the effect of air and vacuum exposure of both pristine 3D and quasi-2D PEA2MAn-1PbnI3n+1 perovskite using the method of UPS and MAES spectroscopies. We found that 3D perovskite degraded to PbI2, and the surface of the quasi-2D perovskite, on the other hand, remain unchanged before and after vacuum/air exposure. The results strongly demonstrated that after the 3D perovskite surface covered with a thin PEA based 2D perovskite (quasi-2D), degradation is ceased in both vacuum and air.
References
[1] I. C. Smith, et al., Angew. Chemie 2014, 126, 11414.
[2] G. Grancini, et al., Nat. Rev. Mater. 2019, 4, 4.
[3] A. Mirzehmet, et al., Adv. Mater. 2021, 33, 2004981.
[4] A. Mirzehmet, et al., Appl. Phys. Express. 2021, 14, 31006.
[5] Y. Harada, et al, Chem. Rev. 1997, 97, 1897.