Hybrid perovskite films deposited by thermal evaporation from a single source

• Published in: Journal of materials science. Materials in electronics Vol. 32; no. 9; pp. 12151 - 12163
• Main Authors: Otalora, Camilo, Botero, Mónica A., Mantilla, Maria. A., Petit, Johann. F., Ospina, Rogelio, Gordillo, Gerardo
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-05-2021; Springer Nature B.V
• Subjects: Chambers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crucibles; Diffusion length; Evaporation rate; Grain size; Heating rate; Materials Science; Optical and Electronic Materials; Optical properties; Partial pressure; Perovskites; Photoconductivity; Photovoltaic cells; Solar cells; Substrates; Thin films
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-05844-3

Hybrid perovskites, such as MAPbI
3,
are very promising materials to fabricate highly efficient and low-cost solar cells and photodetectors. In this work, we propose a new method of deposition of hybrid perovskite thin films through thermal evaporation of MAPbI
3
powder from a single source for which was evaluated the effect of evaporation parameters (distance, time, substrate temperature, chamber pressure, and crucible heating rate) on the structural, optical, and morphological properties. It was found that it is necessary to control adequately the chamber partial pressure, substrate temperature, and the crucible heating rate in order to obtain single-phase MAPbI
3
perovskite films. Also, it was studied the solvent annealing treatment as a method to increase the grain size of evaporated films. Finally, a study of transient and steady-state photoconductivity allowed verifying that the evaporated MAPbI
3
films present fast band to band photogeneration and bimolecular recombination, and also that the grain size growth leads to an increase of the photoconductivity intensity due to the improvement of the diffusion length.