Film deposition, X-ray diffraction and optical absorption of novel (R-NH3)2ZnCl4 hybrid perovskites (Abstract/Poster in convegno)

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  • Film deposition, X-ray diffraction and optical absorption of novel (R-NH3)2ZnCl4 hybrid perovskites (Abstract/Poster in convegno) (literal)
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  • 2008-01-01T00:00:00+01:00 (literal)
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  • Mosca R.; Ferro P.; Besagni T.; Zappettini A.; Licci F. (2008)
    Film deposition, X-ray diffraction and optical absorption of novel (R-NH3)2ZnCl4 hybrid perovskites
    in Learning From And For The Placet Earth-Structures And Models In Earth, Materials And Life Science, Sestri Levante (GE)
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  • Mosca R.; Ferro P.; Besagni T.; Zappettini A.; Licci F. (literal)
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  • In: 1st SIMP-AIC Joint Meeting - Learning From And For The Placet Earth-Structures And Models In Earth, Materials And Life Science (Sestri Levante (GE), 7-12 Settembre 2008). (literal)
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  • Organic-inorganic (CnH2n+1NH3)2MX4 hybrid perovskites (where M is a divalent metal and X a halide) are presently attracting much attention, due to their unique electronic properties and excellent film processability [1]. These self-assembling structures contain 2D semiconductor layers ((MX6)=) alternately stacked with organic ammonium layers. Excitons resulting from the low dimensionality of the semiconductor sheets have binding energy of several tenths eV, and are expected to have interesting potentialities for optoelectronic and electronic applications [2]. In this communication we report on the preparation and the basic X-ray and optical characterization of the novel (CnH2n+1NH3)2ZnCl4 (1n6) compounds, deposited as thin films by spin-coating alcoholic solutions of stoichiometric precursors on glass and quartz substrates. X-ray diffraction data prove that the as-prepared films are single phase, well crystallized and with a dominant in-plane grain orientation. The distance between the inorganic sheets, as measured through the \"d\" parameters, linearly increases with the amine chain length (\"n\" value) (Fig.1a), thus suggesting that the organic chains are ordered perpendicularly to the film surface. The diffraction pattern refinement is presently in progress, in order to assign the appropriate space group and to determine the in-plane lattice parameters. Room temperature optical absorption spectra exhibit a maximum at about 240 nm, which is almost independent on \"n\" (Fig.1b). Such finding is consistent with the results we obtained in the homologous series of Cu-based hybrids [3] and suggests that also in the Zn-compounds the optical absorption phenomena are related to the inorganic cluster of the structure. References. [1] D.B.Mitzi, K.Chondroudis, C.R. Kagan, IBM J.Res.Dev. 45, 29-45, 2001; [2] M.Era, S.Morimoto, T.Tsutsui, S.Saito, Appl.Phys.Lett 65, 676-678, 1994; [3] F.Chiarella, A.Zappettini, T.Besagni, F.Licci, A.Cassinese, M.Barra, R.Vaglio, C.Aruta, Cryst.Res.Technol. 40, 1028-1032, 2005. (literal)
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  • CNR-IMEM, Parma (literal)
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  • Film deposition, X-ray diffraction and optical absorption of novel (R-NH3)2ZnCl4 hybrid perovskites (literal)
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