Please use this identifier to cite or link to this item:
Title: Unraveling the Role of Monovalent Halides in Mixed-Halide Organic-Inorganic Perovskites
Authors: Deepa, Melepurath
Ramos, F. Javier
Shivaprasad, S. M.
Ahmad, Shahzada
Keywords: Chemistry
electron transfer
energy-level diagrams
perovskite phases
surface chemistry
Hybrid Solar-Cells
Sequential Deposition
Photovoltaic Cells
Issue Date: 2016
Publisher: Wiley-V C H Verlag Gmbh
Citation: Deepa, M.; Ramos, F. J.; Shivaprasad, S. M.; Ahmad, S., Unraveling the Role of Monovalent Halides in Mixed-Halide Organic-Inorganic Perovskites. Chemphyschem 2016, 17 (6), 913-920
Abstract: The performance of perovskite solar cells is strongly influenced by the composition and microstructure of the perovskite. A recent approach to improve the power conversion efficiencies utilized mixed-halide perovskites, but the halide ions and their roles were not directly studied. Unraveling their precise location in the perovskite layer is of paramount importance. Here, we investigated four different perovskites by using X-ray photoelectron spectroscopy, and found that among the three studied mixed-halide perovskites, CH3NH3Pb(I0.74Br0.26)(3) and CH3NH3PbBr3-xClx show peaks that unambiguously demonstrate the presence of iodide and bromide in the former, and bromide and chloride in the latter. The CH3NH3PbI3-xClx perovskite shows anomalous behavior, the iodide content far outweighs that of the chloride; a small proportion of chloride, in all likelihood, resides deep within the TiO2/absorber layer. Our study reveals that there are many distinguishable structural differences between these perovskites, and that these directly impact the photovoltaic performances.
Description: Restricted Access
ISSN: 1439-4235
Appears in Collections:Research Articles (Shivaprasad, S. M.)

Files in This Item:
File Description SizeFormat 
  Restricted Access
1.54 MBAdobe PDFView/Open Request a copy

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.