کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1676629 1009005 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of growth temperature and film thickness on the electrical properties of Ba0.7Sr0.3TiO3 thin films grown on platinized silicon substrates by pulsed laser deposition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Effects of growth temperature and film thickness on the electrical properties of Ba0.7Sr0.3TiO3 thin films grown on platinized silicon substrates by pulsed laser deposition
چکیده انگلیسی

Barium strontium titanate Ba0.7Sr0.3TiO3 (BST) thin films, with different growth temperatures (Tg) as well as different film thicknesses, have been prepared on Pt/Ti/SiO2/Si substrates by a reactive pulsed laser deposition method. We observed strong dependences of dielectric properties, such as the Curie–Weiss temperature, dielectric constant, loss tangent, dielectric tunability and leakage current, on the Tg and the BST film thickness. With increase of Tg from 630 to 750 °C, the dielectric constant gradually increases due to the increase in the crystallinity and the grain size. However, the dielectric tunability, loss tangent and leakage current characteristics drastically degrade when the Tg increases up to 750 °C, due to the diffuse and rough interface. The BST film grown at 690 °C shows the best overall dielectric properties with a figure-of-merit of 33 (at 400 kV/cm). These results suggest that film growth process could be optimized by systematically investigating the structure-property relationships. Furthermore, as the BST film thickness increases from 250 to 560 nm, the dielectric properties are remarkably enhanced. The film thickness effect is attributed to the interfacial low-dielectric layers (the so-called “dead layer”) between the BST film and both metal electrodes, which is well explained in terms of a series capacitor model. The thickness and the average dielectric constant for the dead layer are experimentally estimated to be 1.9 nm and 20.3, respectively, in Pt/BST/Pt capacitors.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 496, Issue 2, 21 February 2006, Pages 376–382
نویسندگان
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