scholarly journals A Highly Tunable Barium Strontium Titanate Thin Film MIM Varactor With Floating Metal

2021 ◽  
Author(s):  
S Nath
Keyword(s):  
Thin Film ◽  
Barium Strontium Titanate ◽  
Coplanar Waveguide ◽  
Frequency Range ◽  
Metal Insulator ◽  
Capacitance Density ◽  
Barium Strontium ◽  
Metal Insulator Metal ◽  
Field Dependent ◽  
Bst Thin Film

A ferroelectric metal insulator metal (MIM) varactor structure incorporating a floating metal and coplanar waveguide (CPW) has been introduced here. The work of the proposed varactor is based on the field-dependent material properties of (Ba,Sr)TiO3 (BST) thin film. A capacitance tunability of 44% has been achieved for the bias voltage of 0 V to 10 V over a frequency range of 1 GHz to 3 GHz. The proposed varactor structure yields a compact area, high capacitance density, and reduced mask process (2 masks)

scholarly journals A Highly Tunable Barium Strontium Titanate Thin Film MIM Varactor With Floating Metal

2021 ◽  
Author(s):  
S Nath
Keyword(s):  
Thin Film ◽  
Barium Strontium Titanate ◽  
Coplanar Waveguide ◽  
Frequency Range ◽  
Metal Insulator ◽  
Capacitance Density ◽  
Barium Strontium ◽  
Metal Insulator Metal ◽  
Field Dependent ◽  
Bst Thin Film

A ferroelectric metal insulator metal (MIM) varactor structure incorporating a floating metal and coplanar waveguide (CPW) has been introduced here. The work of the proposed varactor is based on the field-dependent material properties of (Ba,Sr)TiO3 (BST) thin film. A capacitance tunability of 44% has been achieved for the bias voltage of 0 V to 10 V over a frequency range of 1 GHz to 3 GHz. The proposed varactor structure yields a compact area, high capacitance density, and reduced mask process (2 masks)

Radio Frequency (RF) Magnetron Sputtered Barium Strontium Titanate (BST) Thin Film

2017 ◽  
Vol 727 ◽  
pp. 942-946 ◽  
Author(s):  
Juan Li ◽  
Cong Chun Zhang ◽  
Yan Lei Wang ◽  
Yang Gao ◽  
Xiao Lin Zhao
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Dielectric Properties ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Perovskite Phase ◽  
Rf Magnetron Sputtering ◽  
Barium Strontium ◽  
Metal Insulator Metal ◽  
Bst Thin Film

Barium strontium titanate (BST) thin films with excellent dielectric properties are deposited by on-axis RF magnetron sputtering system. The effects of composition of the target and oxygen partial pressure on the microstructure of BST thin film have been investigated. The dielectric properties of the thin films are investigated. The results show that composition of BST thin film deposited with pure argon ambient by the target with 30atm% excess of Ba and Sr is stoichiometric. Perovskite phase can be observed in the thin film annealed in oxygen at 750 °C for 30 min. A metal-insulator-metal (MIM) capacitor is fabricated by microfabrication technique. The capacitance value at 2 GHz is 0.417 pF and 1.42 pF for 50 nm and 90 nm BST thin film respectively, and the leakage current density is 6×10-6 A/cm2 and 5.35×10-8 A/cm2 respectively.

scholarly journals THE DETERMINATION OF BARIUM STRONTIUM TITANATE THIN FILM BAND GAP ENERGY Ba0,15Sr0,85TiO3 USING ULTRAVIOLET-VISIBLE SPECTROSCOPY

2020 ◽  
Vol 5 (1) ◽  
pp. 11-20
Author(s):  
Rahmi Dewi ◽  
Krisman Krisman ◽  
Zulkarnaen Zulkarnaen ◽  
Rahmi Afrida Syahraini ◽  
TS Luqman Husein
Keyword(s):  
Thin Film ◽  
Thin Layer ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Barium Strontium ◽  
Vis Spectroscopy ◽  
Bst Thin Film

A thin layer of Barium Strontium Titanate Ba0.15Sr0.85TiO3 (BST) was developed on a glass substrate using a sol-gel method with annealing temperatures and spin coating process at 3500 rpm for 30 seconds. The annealing temperature varied from 600oC, 650oC, and 700oC.  Characterization of optical properties was developed using UV-Vis spectroscopy to determine the energy bandgap. The values of the BST thin layer energy band at the annealing temperature were 3.55 eV, 3.32 eV, and 3.10 eV, respectively. The results indicate that the BST thin film was a semiconductor material.

Electrodynamic Properties of Single-Crystal and Thin-Film Strontium Titanate, and Thin-Film Barium Strontium Titanate

1999 ◽  
Vol 603 ◽  
Author(s):  
A.T. Findikoglu ◽  
Q.X. Jia ◽  
C. Kwon ◽  
B.J. Gibbons ◽  
K.Ø. Rasmussen ◽  
...  
Keyword(s):  
Thin Film ◽  
Single Crystal ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Room Temperature ◽  
Coplanar Waveguide ◽  
Low Frequency ◽  
Dissipation Factor ◽  
Barium Strontium ◽  
Dc Bias

AbstractWe have used a coplanar waveguide structure to study broadband electrodynamic properties of single-crystal and thin-film strontium titanate (STO), and thin-film barium strontium titanate (BSTO). We have implemented low-frequency capacitance (100 Hz - 1 MHz), swept-frequency transmittance (45 MHz - 4 GHz), and time-domain transmittance (dc - several GHz) measurements to determine effective refractive index (or, dielectric constant), and dissipation factor (or, loss tangent) as a function of dc bias (up to 4×106 V/m) and temperature (20 - 300 K). The STO samples used superconducting electrodes and were designed to operate at cryogenic temperatures, whereas BSTO samples used normal conducting electrodes and exhibited optimal performance around room temperature. By using nearly identical electrode geometries for all devices, we were able to conduct a direct comparative study among them, and investigate not only single-crystal vs thin-film, but also cryogenic vs room-temperature applications.

scholarly journals Study of the Layer-Type BST Thin Film with X-ray Diffraction and X-ray Photoelectron Spectroscopy

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 578
Author(s):  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Photoelectron Spectroscopy ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Barium Strontium ◽  
Bst Thin Film

In the present paper, results of X-ray photoelectron studies of electroceramic thin films of barium strontium titanate, Ba1−xSrxTiO3 (BST), composition deposited on stainless-steel substrates are presented. The thin films were prepared by the sol-gel method. A spin-coating deposition of BST layers with different chemical compositions was utilized so the layer-type structure of (0-2) connectivity was formed. After the deposition, the thin-film samples were heated in air atmosphere at temperature T = 700 °C for 1 h. The surfaces of BST thin films subjected to thermal treatment were studied by X-ray diffraction. X-ray diffraction measurements confirmed the perovskite-type phase for all grown thin-film samples. The oxidation states of the elements were examined by the X-ray photoelectron spectroscopy method. X-ray photoelectron spectroscopy survey spectra as well as high-resolution spectra (photo-peaks) of the main metallic elements, such as Ti, Ba, and Sr, were compared for the layer-type structures, differing in the deposition sequence of the barium strontium titanate layers constituting the BST thin film.

Sign in / Sign up

Export Citation Format

Share Document