Istituto dei materiali per l'elettronica ed il magnetismo     
Ferro P., Mosca R., Besagni T., Calestani D., Zappettini A., Zha M., Iannotta S., Nardi M., Toccoli T., Mares J., Hubík P., Kristofik J., Licci F. Sensitization of SnO2 and ZnO nanostructures by CH3NH3SnCl3 hybrid particles. In: Associazione Italiana di Cristallografia, 38° Congresso Nazionale (Salerno, 20-23 settembre 2009).
With the aim of developing metal oxide nanostructures optimally designed to match the physical requirements of their applications, we tried to modify the surface of either ZnO tetrapods and SnO2 nanowires by evaporation of hybrid organic-inorganic self-assembled perovskites (surface sensitization) and investigated the resulting photoluminescence (PL) properties. Film of CH3NH3SnCl3 hybrid perovskite were thermally ablated on either ZnO tetrapods (TP) deposited on quartz substrates [see L Zanotti et al., this conference] or SnO2 nanowires (NW) grown on alumina substrates. By using a shadow mask hybrid was deposited only on one half of the ZnO TP and SnO2 NW substrates, thus leaving bare nanostructures on the other half. PL measurements were performed on the two portions of each substrate by using an excitation wavelength λ=325 nm. We observed that hybrid has negligible effects on the PL spectra of ZnO TP, but significantly modify the PL of SnO2 NWs. Bare SnO2 nanowires in fact show the usual broad featureless PL peak in the 400-600 nm range, while after hybrid deposition the peak shape is strongly modified with a slight red-shift. Since the changes of NW PL do not scale with hybrid thickness, and, on the other hand, the PL efficiency of the hybrid itself is quite modest to justify the phenomenon, we suggest that the observed effect has to be imputed to the formation of interfaces due to the interaction between the nanostructure matrix and hybrid. The mechanisms of such interaction and the consequent PL modification are presently investigated.
Subject 72.20.-i

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