Electro-Optic Properties of (100)-Oriented (Pb,La(Zr,Ti)O3 Thin Film

(100)-oriented PLZT ((Pb1-x, Lax) (Zry,Ti1-y)1-x/4O3, x/y=9/65) films of up to ~ 1.23 μm have been developed on LaAlO3single crystal substrate by magnetron sputtering. The as-grown PLZT thin films exhibit high optical transparency in visible and near-infrared light wavelength and high quadratic (Kerr) EO coefficients. Prism coupler measurements reveal that the PLZT thin films possess large refractive index, as high as 2.524 in TE model and 2.481 in TM model. The transparency of >70% in the range of λ= 500-1200 nm, the optic band gap of 3.42 eV and the quadratic electro-optic (EO) coefficient of 3.38 x 10-17(m/V)2have been measured in the films. Due to the large EO coefficient and the micrometric thickness, the as-developed PLZT films have great potential in developing longitudinal-or transverse-type EO devices in electric and optic field

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Morphological transformations in solution-cast Styrene-Butadiene-Styrene (SBS) triblock copolymer thin films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013729x ◽

1995 ◽

Vol 53 ◽

pp. 184-185

Author(s):

Ginam Kim ◽

W. Marsillo ◽

M. Libera

Keyword(s):

Thin Films ◽

Triblock Copolymer ◽

Annealing Treatment ◽

Minor Component ◽

Solvent Evaporation ◽

Single Crystal Substrate ◽

Transparent Films ◽

Crystal Substrate ◽

Solution Cast ◽

Morphological Transformations

The fact that block copolymers can assume a range of morphologies depending upon such variables as relative block length and molecular weight is now well known. In the case of poly(styrene)[PS]-poly(butadiene)[PB]-poly(styrene) (SBS) triblock copolymer, the morphologies range from spheres (roughly ~20% minor component), to cylinders (roughly 20%~35% minor component), to lamellae (roughly equal component fractions) Most recently, there has been increasing interest in transformations between morphologies by thermal annealing. This paper describes initial results studying the effect of solvent evaporation rate and post-casting annealing treatment on the morphology of SBS thin films.TEM specimens were prepared by solution casting electron transparent films. 50 μl of 0.1 wt% SBS (30% styrene, Mw=14,000, Scientific Polymer Products, Inc.) dissolved in toluene was deposited on a polished NaCl single crystal substrate placed in a small dish. After solvent evaporation the film was cut into small squares, floated from the salt in water, and each square was collected on a Cu grid.

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Two-dimensional perovskites with alternating cations in the interlayer space for stable light-emitting diodes

Nanophotonics ◽

10.1515/nanoph-2021-0037 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Yiyue Zhang ◽

Masoumeh Keshavarz ◽

Elke Debroye ◽

Eduard Fron ◽

Miriam Candelaria Rodríguez González ◽

...

Keyword(s):

Thin Films ◽

Near Infrared ◽

Light Emitting Diodes ◽

Interlayer Space ◽

High Current Density ◽

Operational Stability ◽

Infrared Light ◽

Two Dimensional ◽

Commercial Development ◽

Light Emitting

Abstract Lead halide perovskites have attracted tremendous attention in photovoltaics due to their impressive optoelectronic properties. However, the poor stability of perovskite-based devices remains a bottleneck for further commercial development. Two-dimensional perovskites have great potential in optoelectronic devices, as they are much more stable than their three-dimensional counterparts and rapidly catching up in performance. Herein, we demonstrate high-quality two-dimensional novel perovskite thin films with alternating cations in the interlayer space. This innovative perovskite provides highly stable semiconductor thin films for efficient near-infrared light-emitting diodes (LEDs). Highly efficient LEDs with tunable emission wavelengths from 680 to 770 nm along with excellent operational stability are demonstrated by varying the thickness of the interlayer spacer cation. Furthermore, the best-performing device exhibits an external quantum efficiency of 3.4% at a high current density (J) of 249 mA/cm2 and remains above 2.5% for a J up to 720 mA cm−2, leading to a high radiance of 77.5 W/Sr m2 when driven at 6 V. The same device also shows impressive operational stability, retaining almost 80% of its initial performance after operating at 20 mA/cm2 for 350 min. This work provides fundamental evidence that this novel alternating interlayer cation 2D perovskite can be a promising and stable photonic emitter.

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Microstructure and enhanced in-plane ferroelectricity of Ba0.7Sr0.3TiO3 thin films grown on MgAl2O4 (001) single-crystal substrate

Applied Physics Letters ◽

10.1063/1.2402900 ◽

2006 ◽

Vol 89 (23) ◽

pp. 232906 ◽

Cited By ~ 22

Author(s):

X. Y. Zhou ◽

T. Heindl ◽

G. K. H. Pang ◽

J. Miao ◽

R. K. Zheng ◽

...

Keyword(s):

Thin Films ◽

Single Crystal ◽

Single Crystal Substrate ◽

Crystal Substrate

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Superconducting Yttrium Barium Copper Oxide Thin Films Growing on the Strained Substrates

Siberian Journal of Physics ◽

10.54362/1818-7919-2008-3-4-25-32 ◽

2008 ◽

Vol 3 (4) ◽

pp. 25-32

Author(s):

Aleksandr V. Zakharov ◽

Aleksandr B. Muravjev ◽

Irina S. Pozygun ◽

Gennadiy M. Seropyan ◽

Sergey A. Sychev ◽

...

Keyword(s):

Thin Films ◽

Current Density ◽

Superconducting Devices ◽

Single Crystal Substrate ◽

Superconducting Thin Film ◽

Elastic Stresses ◽

Barium Copper ◽

Crystal Substrate ◽

Long Time ◽

Yttrium Barium

The article is devoted to formation of superconducting thin films on the single-crystal substrate where areas with different values of the critical current density are, that is needed for fabrication of superconducting devices. The method is based on an establishment of elastic mechanical stresses on the substrate crystal under the nanosecond focused pulsed laser irradiation. On the irradiated substrate the superconducting thin film having auxiliary elastic stresses not till the area is over the irradiated section of the substrate is grown. At the same time the critical film current density is suppressed for required values are used to fabricate Josephson junctions. Observations for a long time demonstrate superconducting transport film properties are not varied significantly during the maintenance.

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