Abstract
The present work reports the application of RF-magnetron sputtering technique to realize CsPbBr 70 nm thick films on glass substrate by means of a one-step procedure. The obtained films show highly uniform surface morphology and homogeneous thickness as evidenced by AFM and SEM investigations. XRD measurements demonstrate the presence of two phases: a dominant orthorhombic CsPbBr and a subordinate CsPbBr. Finally, XPS data reveals surface bromine depletion respect to the stoichiometrical CsPbBr composition, nevertheless photoluminescence spectroscopy results confirm the formation of a highly luminescent film. These preliminary results demonstrate that our approach could be of great relevance for easy fabrication of large area perovskite thin films. Future developments, based on this approach, may include the realization of multijunction solar cells and multicolor light emitting devices.
Highlights
IntroductionHalide perovskites have attracted the attention of the scientific community thanks to their excellent optoelectronic properties [1,2,3,4] which make them suitable for applications ranging from light emitting diodes to nanotechnologies [5]
In the last decade, halide perovskites have attracted the attention of the scientific community thanks to their excellent optoelectronic properties [1,2,3,4] which make them suitable for applications ranging from light emitting diodes to nanotechnologies [5]
To be sure to have a representative sample of the overall morphology, we recorded the surface topography in 10 different spots and evaluated the roughness as a mean value of these measurements
Summary
Halide perovskites have attracted the attention of the scientific community thanks to their excellent optoelectronic properties [1,2,3,4] which make them suitable for applications ranging from light emitting diodes to nanotechnologies [5]. Among the materials proposed for optoelectronic devices, halide perovskite materials present several advantages such as the relatively low-cost, the possibility to tune the band gap varying the composition, and the different kind of nanostructure obtainable. The first proposed halide perovskites were constituted by organic and inorganic compounds based on methylammonium lead trihalide (MAPbX3, with X = Cl, Br, I) These materials have a major drawback in their high chemical instability that leads to a significant degradation of the materials in short times, especially after exposure to humidity, UV light and moderately high temperature [11]. Solution-based chemical synthesis represents the most common route used for deposition of thin and thick layers and, among them, spin-coating and dipping techniques are the most widely used [5] These approaches are valuable for assembling small laboratory samples but result less suitable for the production of devices of several square centimeters, or larger, as required for industrial applications. It is an open challenge the search for a techniques that allows the deposition of several layers of different material (perovskites, scaffold layers, hole and electron transport layers, metal electrodes) with controlled characteristics (morphology, thickness, roughness, uniformity) as it’s required for device fabrication
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