Structural and compositional analysis of bulk CH3 NH3 PbI3 and nanoparticle CsPbBr3 perovskite materials by electron microscopy techniques

Juarez-Perez , Emilio J.
Canadian Materials Science Conference (CMSC 2019)
Participation type: 
Comunicación oral
Other authors: 
N. Fernández- Delgado, M. Herrera, F. J. Delgado, A. Tavabi, M. Luysberg, R. Dunin-Borkowski, E. J. Juárez-Pérez, I. Mora-Sero, I. Suárez, J. P. Martínez-Pastor, G. Botton, S. I. Molina
Vancouver (Canada)

CH3NH3PbI3 and CsPbBr3 perovskite materials are of current interest because of their high efficiencies
in solar cell devices and economical fabrication processes [1]. We have investigated different synthesis‐
deposition methodologies using (scanning) transmission electron microscopy techniques. Bulk
CH3NH3PbI3 was synthesized using a one‐step deposition method, with crystallization of the perovskite
occurring directly on the substrate. Although the layer fully covered the substrate, its thickness was
irregular because it formed from independent crystals of different size and orientation. Nanoparticles of
CsPbBr3 were fabricated using a two‐step deposition method, with the nanoparticles first synthesized
and then deposited onto the substrate. No agglomeration of the nanoparticles was observed. However,
the perovskite film did not produce full coverage of the substrate, as some gaps were observed between
the nanoparticles. Our work provides insight for obtaining optimal films for solar cells.
[1] C.R. Kalaiselvi et al., Mater. Lett. 219 (2018)