講演情報
[17a-P02-7]Electron microscopy of Lattice Defects in MASnI3 Perovskite
〇(M1)Jiaxin Chen1, Qing Wang1, Yusuke Shimada1, Shota Kawachino1, Satoshi Iikubo1 (1.Kyushu University)
キーワード：
electron microscopy、lattice defects、perovskite
The performance of Sn-based perovskites is primarily influenced by the oxidation of Sn2+ to Sn4+ and the formation of lattice defects, particularly those involving iodine (I) and Sn, which critically degrade the material's optoelectronic properties and long-term stability.
To investigate the impact of crystal structure and defects in MASnI3, we prepared MASnI3 precursor solutions using one-step method, and fabricated thin films using spin coating followed by short-time heating, as well as powders through drop casting followed by prolonged heating. Transmission electron microscopy (TEM) was used to observe the lattice structure of MASnI3, and potential structural defects were suggested based on the analysis of inverse fast Fourier transform (IFFT) images. To further explore the potential presence of the defects, the image simulation of perfect structure and defect models in different MASnI3 supercells were conducted by TEMPAS. The characteristics and distribution of vacancy defects in MASnI3 crystals are tentatively explored through a combination of experimental observations and image simulations. These findings may offer theoretical insights and technical guidance for improving the stability of Pb-free perovskite solar cells.
To investigate the impact of crystal structure and defects in MASnI3, we prepared MASnI3 precursor solutions using one-step method, and fabricated thin films using spin coating followed by short-time heating, as well as powders through drop casting followed by prolonged heating. Transmission electron microscopy (TEM) was used to observe the lattice structure of MASnI3, and potential structural defects were suggested based on the analysis of inverse fast Fourier transform (IFFT) images. To further explore the potential presence of the defects, the image simulation of perfect structure and defect models in different MASnI3 supercells were conducted by TEMPAS. The characteristics and distribution of vacancy defects in MASnI3 crystals are tentatively explored through a combination of experimental observations and image simulations. These findings may offer theoretical insights and technical guidance for improving the stability of Pb-free perovskite solar cells.