Near Infrared Photothermoelectric Effect in Transparent AZO/ITO/Ag/ITO Thin Films

2021 ◽  
Author(s):  
Catarina Bianchi ◽  
Ana Marques ◽  
Rui Silva ◽  
Tomas Calmeiro ◽  
Isabel Ferreira
Keyword(s):  
Indium Tin Oxide ◽  
Near Infrared ◽  
Thermal Control ◽  
High Energy ◽  
Visible Range ◽  
Azo Thin Film ◽  
Ito Thin Films ◽  
Aluminum Doped Zinc Oxide ◽  
Temperature Constant ◽  
20 Nm

Abstract A new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance (~80%) at wavelengths in the infrared (> 1100 nm) and high transmittance in the visible range is reported here. This was observed in optimized ITO/Ag/ITO structure, 20 nm of Siver (Ag) and 40 nm of Indium Tin Oxide (ITO), deposited on Aluminum doped Zinc Oxide (AZO) thin film. These layers show high energy saving efficiency by keeping the temperature constant inside a glazed compartment under solar radiation, but additionally they also show a photothermoelectric effect. Under uniform heating of the sample a thermoelectric effect is observed (S = 40 μV/K), but when irradiated, a potential proportional to the intensity of the radiation is also observed. Therefore, in addition to thermal control in windows, these low emission coatings can be applied as transparent photothermoelectric devices.

scholarly journals Near infrared photothermoelectric effect in transparent AZO/ITO/Ag/ITO thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Bianchi ◽  
A. C. Marques ◽  
R. C. da Silva ◽  
T. Calmeiro ◽  
I. Ferreira
Keyword(s):  
Indium Tin Oxide ◽  
Near Infrared ◽  
Thermal Control ◽  
High Energy ◽  
Visible Range ◽  
Azo Thin Film ◽  
Ito Thin Films ◽  
Aluminum Doped Zinc Oxide ◽  
Temperature Constant ◽  
20 Nm

AbstractA new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance (~ 80%) at wavelengths in the infrared (> 1100 nm) and high transmittance in the visible range is reported here. This was observed in optimized ITO/Ag/ITO structure, 20 nm of Silver (Ag) and 40 nm of Indium Tin Oxide (ITO), deposited on Aluminum doped Zinc Oxide (AZO) thin film. These layers show high energy saving efficiency by keeping the temperature constant inside a glazed compartment under solar radiation, but additionally they also show a photothermoelectric effect. Under uniform heating of the sample a thermoelectric effect is observed (S = 40 mV/K), but when irradiated, a potential proportional to the intensity of the radiation is also observed. Therefore, in addition to thermal control in windows, these low emission coatings can be applied as transparent photothermoelectric devices.

scholarly journals Atomic Layer-Deposited Al-Doped ZnO Thin Films for Display Applications

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 539 ◽  
Author(s):  
Dimitre Dimitrov ◽  
Che-Liang Tsai ◽  
Stefan Petrov ◽  
Vera Marinova ◽  
Dimitrina Petrova ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Atomic Layer ◽  
Optical Transmittance ◽  
Flexible Polymer ◽  
Polymer Dispersed ◽  
Infrared Spectral ◽  
Aluminum Doped Zinc Oxide

The integration of high uniformity, conformal and compact transparent conductive layers into next generation indium tin oxide (ITO)-free optoelectronics, including wearable and bendable structures, is a huge challenge. In this study, we demonstrate the transparent and conductive functionality of aluminum-doped zinc oxide (AZO) thin films deposited on glass as well as on polyethylene terephthalate (PET) flexible substrates by using an atomic layer deposition (ALD) technique. AZO thin films possess high optical transmittance at visible and near-infrared spectral range and electrical properties competitive to commercial ITO layers. AZO layers deposited on flexible PET substrates demonstrate stable sheet resistance over 1000 bending cycles. Based on the performed optical and electrical characterizations, several applications of ALD AZO as transparent conductive layers are shown—AZO/glass-supported liquid crystal (LC) display and AZO/PET-based flexible polymer-dispersed liquid crystal (PDLC) devices.

scholarly journals Effect of Oxygen Flow Rate on Properties of Aluminum-Doped Indium-Saving Indium Tin Oxide (ITO) Thin Films Sputtered on Preheated Glass Substrates

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1604
Author(s):  
Svitlana Petrovska ◽  
Ruslan Sergiienko ◽  
Bogdan Ilkiv ◽  
Takashi Nakamura ◽  
Makoto Ohtsuka
Keyword(s):  
Thin Films ◽  
Flow Rate ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxygen Flow Rate ◽  
Oxygen Flow ◽  
Visible Range ◽  
Oxide Content ◽  
Glass Substrates ◽  
Ito Thin Films

Amorphous aluminum-doped indium tin oxide (ITO) thin films with a reduced indium oxide content of 50 mass% were manufactured by co-sputtering of ITO and Al2O3 targets in a mixed argon–oxygen atmosphere onto glass substrates preheated at 523 K. The oxygen gas flow rate and heat treatment temperature effects on the electrical, optical and structural properties of the films were studied. Thin films were characterized by means of a four-point probe, ultraviolet–visible-infrared (UV–Vis-IR) spectroscopy and X-ray diffraction. Transmittance of films and crystallization temperature increased as a result of doping of the ITO thin films by aluminum. The increase in oxygen flow rate led to an increase in transmittance and hindering of the crystallization of the aluminum-doped indium saving ITO thin films. It has been found that the film sputtered under optimal conditions showed a volume resistivity of 713 µΩcm, mobility of 30.8 cm2/V·s, carrier concentration of 2.9 × 1020 cm−3 and transmittance of over 90% in the visible range.

Influence of Annealing Atmosphere on the Characteristics of Sol-Gel Derived ITO Thin Films

2013 ◽  
Vol 684 ◽  
pp. 279-284 ◽  
Author(s):  
Yu Ming Peng ◽  
Yan Kuin Su ◽  
Ru Yuan Yang
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Indium Tin Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
Visible Range ◽  
Annealing Atmosphere ◽  
Optical And Electrical Properties ◽  
Ito Thin Films ◽  
Ito Films

In this paper, the Indium Tin Oxide (ITO) thin films were prepared by a sol-gel dip coating method and then annealed at 600°C under different atmosphere (vacuum, N2 and 96.25%N2+3.75%H2). Their microstructure, optical and electrical properties were investigated and discussed. Suitable atmosphere can improve the crystalline of the ITO films, therefore the optical and electrical properties of the ITO films are improved. The uv-vis results showed the maximum of transmittance in the visible range (380-780 nm) of 85.6% and the lowest resistivity of 4.4×10-2 Ω-cm when the ITO films were annealed under 96.25% N2 with 3.75% H2 atmosphere.

scholarly journals Ga-Doped ZnO Coating—A Suitable Tool for Tuning the Electrode Properties in the Solar Cells with CdS/ZnS Core-Shell Quantum Dots

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 137
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
Ajaya Kumar Singh ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Quantum Dots ◽  
Solar Cells ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Optical Transmittance ◽  
Visible Range ◽  
Infrared Range ◽  
Layer System ◽  
Doped Zno

Two layer system from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO, GZO) were studied for transparency in the visible electromagnetic range, reflectivity in the near infrared range, conductivity and valent band for a solar cells with quantum dots. The bi-layer coatings produced at optimized oxygen partial pressure, films thickness and surface roughness exhibit improved optical properties without worsening the electrical parameters, even if additional oxygen introduction during the reactive sputtering of the GZO. With an average optical transmittance of 91.3% in the visible range, average reflection and resistivity lower than 0.4 × 10−2 Ω.cm, these coatings are suitable for top electrode in the solar cells. The obtained results reveal that multilayered stacks of transparent ITO/Ga-doped ZnO coatings possess relatively low surface roughness (7–9 nm) and appropriate refractive index. The additional oxidation of GZO films induces modification of the film thickness and respectively of their optical performances.

scholarly journals A Multi-Position Drum-Type Assembly for Simultaneous Film Deposition at Different Temperatures in a Single Sputter Cycle–Application to ITO Thin Films

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1076
Author(s):  
Akhmed K. Akhmedov ◽  
Abil S. Asvarov ◽  
Arsen E. Muslimov ◽  
Vladimir M. Kanevsky
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Film Deposition ◽  
Visible Range ◽  
Magnetron Deposition ◽  
Average Transmittance ◽  
Temperature Dependences ◽  
Different Temperatures ◽  
Ito Thin Films

The design of a multi-position drum-type assembly (MPDTA) for heating and positioning substrates with the possibility of individually setting and controlling the temperature of each substrate, which is applicable for laboratory-type sputtering setups, is described. The above design provides the possibility of the simultaneous deposition of thin films under identical conditions on several substrates at different temperatures, making it possible to explore the temperature dependences of the films’ morphology, structure, and functional characteristics in one single vacuum deposition cycle. As a case study, the possibility of investigating such dependencies for the magnetron deposition of transparent conducting indium–tin oxide (ITO) thin films was demonstrated using the MPDTA. The investigation results revealed that the functional performances of deposited ITO thin films (resistivity and average transmittance in the visible range) improved with increasing the substrate temperature, reaching values of 1.5 × 10−4 Ω·cm and over 80%, respectively, at 300 °C.

scholarly journals Fabrication of Transparent ITO/Ga-Doped ZnO Coating as a Front Panel Electrode toward Efficient Thin Film Solar Cells

2020 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Kostadinka Gesheva ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Visible Region ◽  
Optical Transmittance ◽  
Front Panel ◽  
Visible Range ◽  
Infrared Range ◽  
Electromagnetic Spectrum

Bi-layer coatings from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO) were investigated for transparency in the visible range of the electromagnetic spectrum, optical rejection ability in the near infrared spectrum and conductivity for the novel quantum dot-based solar cells. The multilayer stack produced at optimal oxygen partial pressure exhibits improved optical properties without worsening the electrical ones, even after additional oxidation during the reactive sputtering of the metal-oxides. With a mean optical transmittance of 91.3% in the visible region, mean optical rejection greater than 65% in the infrared range and resistivity lower than 0.4 × 10−2 Ω.cm, this coating is good candidate for front panel electrode in the CdS/ZnS core-shell quantum dot-based solar cells.

scholarly journals Transparent functional nanocomposite films based on octahedral metal clusters: synthesis by electrophoretic deposition process and characterization

2019 ◽  
Vol 6 (3) ◽  
pp. 181647 ◽  
Author(s):  
Ngan Thi Kim Nguyen ◽  
Marion Dubernet ◽  
Yoshio Matsui ◽  
Maxence Wilmet ◽  
Naoto Shirahata ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Physical Stability ◽  
Polymer Nanocomposite ◽  
Deposition Process ◽  
Nanocomposite Films ◽  
Visible Range ◽  
Homogeneous Distribution ◽  
Ito Glass

Transparent optical thin films have recently attracted a growing interest for functional window applications. In this study, highly visible transparent nanocomposite films with ultraviolet (UV)-near-infrared (NIR)-blocking capabilities are reported. Such films, composed of Mo 6 and Nb 6 octahedral metal atom clusters (MC) and polymethylmethacrylate polymer (PMMA), were prepared by electrophoretic deposition on indium tin oxide-coated glass (ITO glass). PMMA was found to improve both the chemical and physical stability of Mo 6 and Nb 6 MCs, resulting in a relatively homogeneous distribution of the clusters within the PMMA matrix, as seen by microstructural observations. The optical absorption spectrum of these transparent MC@polymer nanocomposite films was marked by contributions from their Mo 6 and Nb 6 -based clusters (absorption in the UV range) and from the ITO layer on silica glass (absorption in the NIR range). Mo 6 @PMMA nanocomposite films also exhibited excellent photoluminescence properties, which were preserved even after exposure to 50°C at a relative humidity of 70% for one month. These films cumulate high transparency in the visible range with remarkable UV-NIR blocking properties and represent interesting candidates for functional glass application.

Preparation and Physical Properties of ITO Thin Films by Spray Pyrolysis Method

2012 ◽  
Vol 465 ◽  
pp. 268-275 ◽  
Author(s):  
Yang Zhou ◽  
Guang Ming Wu ◽  
De Wen Gao ◽  
Guang Jian Xing ◽  
Yan Ying Zhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Spray Pyrolysis ◽  
Indium Tin Oxide ◽  
Visible Range ◽  
Spray Pyrolysis Method ◽  
Optimal Conditions ◽  
Photoelectric Properties ◽  
Ito Thin Films ◽  
Ito Films

Indium tin oxide (ITO) films were deposited on glass substrates by using the homemade spray pyrolysis system. Orthogonal test was designed to examine the optimal conditions for preparation of the ITO films. The results showed that the ITO thin films can be prepared by the homemade spray pyrolysis device successfully. The device is simple in structure and easy to use. The substrate temperature is the main factor on the photoelectric properties of the ITO films. The optimal conditions for preparing the ITO thin films were as following: the substrate temperature is 300oC, the carrier gas flow of the air was 1.5 L•min-1, the annealing temperature was 500oC, the proportion of the indium and tin was 10:1, the distance between substrate and nozzle was 8 cm, and the deposition time was 3.5 min. The average optical transmittance in the visible range and sheet resistance of the ITO film were 93% and 2786Ω/□, respectively.

scholarly journals Effects of substrate temperature on the properties of the indium tin oxide thin films deposited by sputtering method

2018 ◽  
Vol 185 ◽  
pp. 00006
Author(s):  
Chia-Ching Wu ◽  
Chien-Chen Diao
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Deposition Temperature ◽  
Optical Transmittance ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Visible Range ◽  
Radio Frequency Sputtering ◽  
Ito Thin Films

High-quality transparent conductive indium tin oxide (ITO) thin films were deposited on glass substrates using radio frequency sputtering method. The structure and electrical and optical properties of the ITO thin films were mainly investigated. The ITO thin films showed strong diffraction peak having a preferred orientation along the [111] direction as the deposition temperature at 120 to 160 °C. In the transmission spectra, the optical transmittance increased in the visible range as the deposition temperature increased from RT to 160 °C. A minimum resistivity of 3.06×10-3 Ω-cm was obtained for the ITO thin film deposition at 160 °C.

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