Abstract
This work involves an investigation of nanostructures, microelectronic properties and domain engineering of nanoparticles thin layers of Pb(Zn1/ 3Nb2/3)O3-PbTiO3 (PZN-PT) ferroelectric single crystals deposited on nanostructured silicon substrate. In this study, devices made from PZN-4.5PT nanoparticles thin films successfully deposited on silicon substrate have been studied and discussed. SEM images show the formation of local black circles and hexagonal shapes probably due to the nucleation of a new Si-gel component or phase induced by annealing. Micro Xray Fluorescence mapping shows that the high values of Si and B atoms (≅7 and 4 normalized unit respectively) can be explained by the fact that the substrate is p-type silicon. The most interesting result of optical measurements is the very good absorption for all the thin films in UV, Visible and NIR regions with values from 70% to 90% in UV, from 75% to 93% in Visible and NIR. Tauc plots present particularities (rarely encountered behavior) with different segments or absorption changes showing the presence of multiple band gaps coming from the heterogeneity of the thin films (nanowires, gel and nanoparticles). Their values are 1.9 and 2.8 eV for DKRN-Gel, 2.1 and 3.1 eV for DKRN-UD and 2.1 and 3.2 eV for DKRN-D) corresponding respectively to the band gap of nanowires and that of the gel while the last ones correspond to the undoped and doped nanoparticles (3.1 and 3.2 eV respectively).
Highlights
Among various everlasting desires of all the materials scientists, the most important is the search of materials with as maximum functionalities as possible [1] [2]
This work involves an investigation of nanostructures, microelectronic properties and domain engineering of nanoparticles thin layers of Pb(Zn1/ 3Nb2/3)O3-PbTiO3 (PZN-PT) ferroelectric single crystals deposited on nanostructured silicon substrate
Devices made from PZN-4.5PT nanoparticles thin films successfully deposited on silicon substrate have been studied and discussed
Summary
Among various everlasting desires of all the materials scientists, the most important is the search of materials with as maximum functionalities as possible [1] [2]. Ferroelectric lead compounds having a perovskite structure, such as Pb(Zn1/3Nb2/3)O3 (PZN) [19], Pb(Mg1/3Nb2/3)O3 (PMN) [20], and their solid solutions with Pb(TiO3) (PT), have been investigated for high-performance ultrasonic transducer applications [21] [22] These last years, high levels of piezoelectricity have been published for Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) and PZN-PT single crystals: d33 > 2500 pC/N, d31 > −1500 pC/N, k33 > 90%, k31 > 80% and kt > 60% [23] [24] [25] [26], showing at least ferroelectric, ferroelastic and piezoelectric properties. The greatest difficulty to use such single crystals on electronic devices is to achieve them in thin layers form because of their incongruent melting property The integration of such materials as thin films has attracted considerable research attention thanks to their outstanding performances that allow to consider new features for the realization of photovoltaic device
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