Showing 2 results for Asadpour Arzefooni
Asadpour Arzefooni, Izadifard, Ghazi ,
Volume 28, Issue 4 (12-2020)
Abstract
In this study, CH3NH3SnI3 Perovskite thin films were prepared on different substrates, Glass, FTO, and mesoporous TiO2 by easy and cheap thermal evaporation method in one step. Then, structural, morphology and optical properties of the layers were investigated. The XRD patterns and Raman spectra showed that all samples have α-phase tetragonal Perovskite structures and crystallinity, as well as the morphology of the samples significantly changes as the substrates changes. Investigation of the optical properties of the samples showed that despite small thickness of the layers (about 200 nm), the absorption coefficient of the layers (specially the layer grown on FTO substrate) is significantly large (in order of 105 cm-1). This result with the values of the bandgap of the layers (1.28-1.53 eV) show that the synthesized CH3NH3SnI3 Perovskite thin films are a very good candidate for using in solar cells as absorber layers.
Asadpour Arzefooni, Izadifard, Ghazi, Arab Pour,
Volume 29, Issue 4 (12-2021)
Abstract
In this research, MASnICl2 and FASnICl2 thin layers were synthesized by the one-step spin coating method, and then their structural, optical and electrical properties were investigated. The study of these samples (structural properties) showed that the layers have a tetragonal structure (α- phase perovskite), and with the change of organic cation, the crystallinity and morphology of the layers significantly change. These changes also have influences in the optical and electrical properties of the samples. The perovskite layers have a high absorption coefficient (of the order of 105 cm-1) in the visible range. The bandgap for the FASnICl2 layer was 1.48 eV and for the MASnICl2 layer was 1.54 eV. A strong peak close to bandgap was observed in the room temperature PL of the layers, which was remarkably more intense for the FASnICl2 sample. This study showed that the FASnICl2 layers have better crystallinity, lower electrical resistance, higher optical sensitivity and acceptable optical response comparing the MASnICl2 layers, and therefore, they can be suitable options for use as an adsorbent layer in perovskite solar cells.