Seminario de Ingeniería de Materiales FIME-UANL - Submission (26-09-2019 11:23:21)

Seminario de Ingeniería de Materiales FIME-UANL - Submission (26-09-2019 11:23:21)

26/09/2019

Lugar : Auditorios: Ing. René Mario Montante / Dr. Raúl G. Quintero Flores

Fecha : 10/04/2019 17:00

Expositor : Sebin Devasia

Asesor : Dr. Bindu Krishnan

Co-Asesor :

Moderador :

Título de la conferencia : Spray pyrolyzed Cs-Bi halide Perovskite thin films via anion splitting

Resumen : Followed by the excellent developments in the field of optoelectronics, especially photovoltaics, the perovskite materials have become an interesting material for engineering among the researchers. However, the growing demand to address the limitations of conventional organo-lead halide perovskite materials, primarily, the presence of toxic lead, instability in ambient conditions, hysteretic effects due to the organic molecules and absence of large-area deposition techniques, have led to the exploration of a number of hybrid all-inorganic lead-free perovskite materials (AILFPs). In this perspective, the all-inorganic lead-free perovskite CsBiX(X=I/Cl/Br) have gained considerable attention due to the absence of Pb and most importantly, the superior chemical stability as compared to their Pb analogs. Furthermore, their double perovskite structures with cation and anion substitutions exhibit better optoelectronic properties. Here, the chemical spray pyrolysis technique for large area deposition will be used to fabricate CsBiX thin films by optimizing various deposition conditions. Besides, sulfur incorporated CsBiSX perovskite thin films will also be fabricated under optimized conditions. Subsequently, investigations on the photophysical properties using XRD, Raman spectroscopy, UV-Vis-NIR spectroscopy, SEM, XPS, AFM, and photoresponse measurements will be carried out. Moreover, theoretical simulations employing VASP software can contribute to the atomic level understanding of structure-optoelectronic relations in these hybrid materials. The results are expected to contribute to a better understanding of transport mechanisms and enhanced device efficiencies with improved stability in the field of all-inorganic perovskite research.

Imagen :

abstrac2t.png
abstrac2t.png


Title of the conference : Spray pyrolyzed Cs-Bi halide Perovskite thin films via anion splitting

Summary : Followed by the excellent developments in the field of optoelectronics, especially photovoltaics, the perovskite materials have become an interesting material for engineering among the researchers. However, the growing demand to address the limitations of conventional organo-lead halide perovskite materials, primarily, the presence of toxic lead, instability in ambient conditions, hysteretic effects due to the organic molecules and absence of large-area deposition techniques, have led to the exploration of a number of hybrid all-inorganic lead-free perovskite materials (AILFPs). In this perspective, the all-inorganic lead-free perovskite CsBiX(X=I/Cl/Br) have gained considerable attention due to the absence of Pb and most importantly, the superior chemical stability as compared to their Pb analogs. Furthermore, their double perovskite structures with cation and anion substitutions exhibit better optoelectronic properties. Here, the chemical spray pyrolysis technique for large area deposition will be used to fabricate CsBiX thin films by optimizing various deposition conditions. Besides, sulfur incorporated CsBiSX perovskite thin films will also be fabricated under optimized conditions. Subsequently, investigations on the photophysical properties using XRD, Raman spectroscopy, UV-Vis-NIR spectroscopy, SEM, XPS, AFM, and photoresponse measurements will be carried out. Moreover, theoretical simulations employing VASP software can contribute to the atomic level understanding of structure-optoelectronic relations in these hybrid materials. The results are expected to contribute to a better understanding of transport mechanisms and enhanced device efficiencies with improved stability in the field of all-inorganic perovskite research.