Persistent photoconductivity in strained epitaxial BiFeO3 thin films.
نویسندگان
چکیده
A drastic change in the conductivity of strained BiFeO3 (BFO) films is observed after illuminating them with above-band gap light. This has been termed as persistent photoconductivity. The enhanced conductivity decays exponentially with time. A trapping character of the sub-band levels and their subsequent gradual emptying is proposed as a possible mechanism.
منابع مشابه
Depth resolved lattice-charge coupling in epitaxial BiFeO3 thin film
For epitaxial films, a critical thickness (tc) can create a phenomenological interface between a strained bottom layer and a relaxed top layer. Here, we present an experimental report of how the tc in BiFeO3 thin films acts as a boundary to determine the crystalline phase, ferroelectricity, and piezoelectricity in 60 nm thick BiFeO3/SrRuO3/SrTiO3 substrate. We found larger Fe cation displacemen...
متن کاملFerroelectric domain structures of epitaxial „001... BiFeO3 thin films
Ferroelectric domain structures of epitaxial BiFeO3 thin films on miscut 001 SrTiO3 substrates have been studied by transmission electron microscopy. BiFeO3 on 0.8° miscut substrates are composed of both 109° and 71° domains; in contrast, only 71° stripe domains are observed in BiFeO3 on 4° miscut 001 SrTiO3 substrates. The domain width in BiFeO3 on 4° miscut substrates increases as film thickn...
متن کاملPhase transitions and domain stabilities in biaxially strained (001) SrTiO3 epitaxial thin films
Related Articles Ferroelectric and electrical characterization of multiferroic BiFeO3 at the single nanoparticle level Appl. Phys. Lett. 99, 252905 (2011) Defect enhanced optic and electro-optic properties of lead zirconate titanate thin films AIP Advances 1, 042144 (2011) Ultrafast switching of ferroelastic nanodomains in bilayered ferroelectric thin films Appl. Phys. Lett. 99, 182906 (2011) P...
متن کاملUnderstanding Strain‐Induced Phase Transformations in BiFeO3 Thin Films
Experiments demonstrate that under large epitaxial strain a coexisting striped phase emerges in BiFeO3 thin films, which comprises a tetragonal-like (T') and an intermediate S' polymorph. It exhibits a relatively large piezoelectric response when switching between the coexisting phase and a uniform T' phase. This strain-induced phase transformation is investigated through a synergistic combinat...
متن کاملTwin wall distortions through structural investigation of epitaxial BiFeO3 thin films
In this work, epitaxial (001) BiFeO3 thin films were deposited on SrTiO3 and TbScO3 single-crystal substrates and analyzed with high-resolution x-ray diffraction—reciprocal space mapping. A basic method was developed to extract structural details of the as-grown BiFeO3 film, including (i) epitaxial strain, (ii) ferroelastic domains, and (iii) lattice rotations. After demonstrating the method, e...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Nano letters
دوره 14 9 شماره
صفحات -
تاریخ انتشار 2014