Abstract
Inorganic metal halide perovskites are relevant semiconductors for optoelectronic devices. The successful deposition of thin films of CsPbBr3 and CsPbCl3 has recently been obtained by Radio-Frequency magnetron sputtering. In this work we compare the morphological, structural and optical characteristics of the two materials obtained with this deposition technique. A detailed photoluminescence (PL) spectroscopy study of the as-grown samples was conducted at the macro and micro scale in a wide temperature range (10-300 K) to fully characterize the PL on sample areas of square centimeters, to assess the origin of the inhomogeneous broadening and to quantify the PL quantum yield quenching. Our results prove that this technique allows for the realization of high quality nanometric films with controlled thickness of relevance for optoelectronic applications.
Highlights
Inorganic metal halide perovskites (IMHP) are an emerging class of semiconductors for photonics, photovoltaics and optoelectronics [1,2,3,4]
In this paper we present results of 70 nm thick CsPbBr3 and CsPbCl3 films grown on glass by RF magnetron sputtering [17, 18]: similar results are found for 140 nm thick samples
Morphological and structural characterization The as-grown samples appear to be quite compact at a micro-scale level as from the SEM micrographs reported in Fig. 1a for CsPbBr3 and in Fig. 1c for CsPbCl3
Summary
Inorganic metal halide perovskites (IMHP) are an emerging class of semiconductors for photonics, photovoltaics and optoelectronics [1,2,3,4]. The interest to investigate such kind of perovskites comes from their promising properties: the highly-efficient radiative recombination, being direct bandgap materials; the tunability of light emission, by varying the material composition to cover the entire visible spectral range [5,6,7]; the robustness towards defects [8,9,10]; the high carrier mobility; the low-cost and easiness of synthesis and deposition, unlike other semiconductors (Si, GaAs, GaN, etc.) commonly used for applications of interest The latter is a crucial aspect; the processes typically required for the fabrication of solid-state light emitters and solar cells are expensive, running counter to the demand of the market for lowcost devices. Solution-based techniques, which represent the most common route used for the deposition of perovskite thin films, do not guarantee the control of the homogeneity over an area of several square centimeters, being unsuitable for industrial production of devices These techniques cannot be used for the realization of CsPbCl3 films because of the lack of proper solvents for its deposition
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