Month: October 2015

Nanocrystalline Ferroelectric BiFeO3 Thin Films by Low-Temperature Atomic Layer Deposition

nanocrystalline ferroelectric

Mariona Coll, Jaume Gazquez, Ignasi Fina, Zakariya Khayat, Andy Quindeau, Marin Alexe, Maria Varela, Susan Trolier-McKinstry, Xavier Obradors, and Teresa Puig;
Chem. Mater., 2015, 27 (18), pp 6322–6328

DOI: 10.1021/acs.chemmater.5b02093

In this work, ferroelectricity is identified in nanocrystalline BiFeO3 (BFO) thin films prepared by low-temperature atomic layer deposition. A combination of X-ray diffraction, reflection high energy electron diffraction, and scanning transmission electron microscopy analysis indicates that the as-deposited films (250 °C) consist of BFO nanocrystals embedded in an amorphous matrix. Postannealing at 650 °C for 60 min converts the sample to a crystalline film on a SrTiO3substrate. Piezoelectric force microscopy demonstrates the existence of ferroelectricity in both as-deposited and postannealed films. The ferroelectric behavior in the as-deposited stage is attributed to the presence of nanocrystals. Finally, a band gap of 2.7 eV was measured by spectroscopic ellipsometry. This study opens broad possibilities toward ferroelectric oxides on 3D substrates and also for the development of new ferroelectric perovskites prepared at low temperature.

Candy Fu

长城照片

Hi! My name is Candy Fu. I come from Wuhan, China. At this moment , I felt lucky and excited to commence my Ph.D study at ICMAB, a tremendously developed platform.  I’ve joined in the group of Superconducting Materials and Nanostructure at Large Scale under the supervision of Narcis Mestres. I am fond of dancing, running, and travelling.

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