Nanostructured Thin Film Materials for Magnetic and Photovoltaic Applications

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 5340

Special Issue Editor


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Guest Editor
Chemical Engineering and Materials Science, University of Minnesota-Twin Cities, Minneapolis, MN, USA
Interests: thin films of magnetic and semiconducting materials; energy materials; nanoscale physics
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Special Issue Information

Dear Colleagues,

Current research in renewable and sustainable energy solutions focuses on developing new materials, either magnetic materials or semiconductors, which have shown potential for such applications. This includes thin films of photovoltaics for solar cells which will have fewer or no critical elements and will also help to reduce the costs of energy harvesting. Similarly, several materials with critical magnetic properties show potential for combining semiconducting and magnetic characteristics into a solution for reducing energy consumption. The next-generation goal for this research lies in applications such as hybrid vehicles, spintronics, low-cost solar energy production, and most importantly building a pathway to sustainable human civilization without any need of critical materials such as fossil fuels.

In the light of this research goal, this Special Issue focuses on the following:

  • Studying nanostructured thin films for photovoltaic applications: novel synthesis techniques, new/improved photovoltaic properties, etc.
  • Obtaining a deep understanding of thin-film photovoltaics with modified band structure achieved through doping or gating.
  • Understanding the spin structure of thin-film magnetic materials for potential energy solutions.
  • New magnetic nanostructured films with intriguing properties which can be exploited to build spintronic solutions to energy problems.

This Special Issue will be regarded as a benchmark for new-generation research on energy harvesting through the thin-film engineering and nanostructuring of related materials.

Dr. Bhaskar Das
Guest Editor

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Keywords

  • photovoltaic thin films
  • magnetic thin films of metals and semiconductors
  • energy harvesting through nanostructuring
  • critical materials reduction
  • sustainable energy solutions

Published Papers (3 papers)

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Research

13 pages, 3889 KiB  
Article
Preparation and Photoelectrochemical Properties of Mo/N Co-Doped TiO2 Nanotube Array Films
by Yaoxin Ding, Danni Xue, Hanzhou Yu and Jie Shen
Coatings 2023, 13(7), 1230; https://doi.org/10.3390/coatings13071230 - 10 Jul 2023
Cited by 1 | Viewed by 1001
Abstract
Mo/N co-doped TiO2 nanotube array films were obtained by a combination of magnetron sputtering and anodization. The influences of doping concentration and nanotube morphology on the structure, morphology, elemental composition, light-absorption capacity, and optoelectronic properties of TiO2 nanotubes were studied. The [...] Read more.
Mo/N co-doped TiO2 nanotube array films were obtained by a combination of magnetron sputtering and anodization. The influences of doping concentration and nanotube morphology on the structure, morphology, elemental composition, light-absorption capacity, and optoelectronic properties of TiO2 nanotubes were studied. The findings revealed that Mo was primarily incorporated into the TiO2 lattice in the Mo6+ valence state, while N was mainly embedded into the lattice as interstitial atoms. It was observed that when the sputtering power was 35 W for TiN target and 150 W for Mo-Ti target, the Mo/N co-doped TiO2 nanotube array films exhibited the best photovoltaic performance with a photogenerated current of 0.50 µA/cm2, which was 5.5 times of that of Mo-doped TiO2. The enhanced photocatalytic efficiency observed in Mo/N co-doped TiO2 nanotube array films can be ascribed to three main factors: an increase in the concentration of photogenerated electrons and holes, a reduction in the band gap width, and intense light absorption within the visible spectrum. Full article
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7 pages, 1236 KiB  
Communication
Temperature Dependence of Photochemical Degradation of MAPbBr3 Perovskite
by Ivan S. Zhidkov, Azat F. Akbulatov, Marina I. Ustinova, Andrey I. Kukharenko, Lyubov A. Frolova, Seif O. Cholakh, Chu-Chen Chueh, Pavel A. Troshin and Ernst Z. Kurmaev
Coatings 2022, 12(8), 1066; https://doi.org/10.3390/coatings12081066 - 28 Jul 2022
Cited by 3 | Viewed by 2123
Abstract
The experimental results of X-ray diffraction (XRD), optical absorbance, scanning electron microscopy (SEM), and X-ray photoelectron spectra (XPS) of the core levels and valence bands of MAPbBr3 (MA-CH3NH3+) perovskite before and after exposure to visible light for [...] Read more.
The experimental results of X-ray diffraction (XRD), optical absorbance, scanning electron microscopy (SEM), and X-ray photoelectron spectra (XPS) of the core levels and valence bands of MAPbBr3 (MA-CH3NH3+) perovskite before and after exposure to visible light for 700 h at temperatures of 10 and 60 °C are presented. It reveals that the light soaking at 60 °C induces the decomposition of MAPbBr3 perovskite accompanied with the decay of organic cation and the release of a PbBr2 phase as a degradation product whereas the photochemical degradation completely disappears while the aging temperature is decreased to 10 °C. Full article
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10 pages, 1633 KiB  
Article
Bi-Function TiO2:Yb3+/Tm3+/Mn2+-Assisted Double-Layered Photoanodes for Improving Efficiency of Dye-Sensitized Solar Cells
by Di Chen, Xiang Fu, Xiaolong Li and Yannan Qian
Coatings 2022, 12(6), 744; https://doi.org/10.3390/coatings12060744 - 29 May 2022
Cited by 3 | Viewed by 1712
Abstract
A bi-function TiO2:Yb3+/Tm3+/Mn2+-assisted double-layered photoanode was designed to improve the efficiency of dye-sensitized solar cells (DSSCs). The scanning electron microscopy (SEM) results show that the introduction of Mn2+ ions leads to smaller-sized TiO2 [...] Read more.
A bi-function TiO2:Yb3+/Tm3+/Mn2+-assisted double-layered photoanode was designed to improve the efficiency of dye-sensitized solar cells (DSSCs). The scanning electron microscopy (SEM) results show that the introduction of Mn2+ ions leads to smaller-sized TiO2:Yb3+/Tm3+/Mn2+ nanospheres, which is changed from nanosheet-shaped TiO2 and TiO2:Yb3+/Tm3+. Based on Scherrer’s formula from the X-ray diffraction (XRD) peak (101), the crystallite sizes decrease due to the introduction of Mn2+ ions. By utilizing screen-printing techniques, DSSCs fabricated by bi-function TiO2:Yb3+/Tm3+/Mn2+-assisted double-layered photoanodes exhibit the short-circuit current density (Jsc) of 15.68 mA/cm2, open-circuit voltage (Voc) of 0.67 V, fill factor (FF) of 0.71 and the power conversion efficiency (PCE) of 7.41%. The PCE of our designed DSSC is higher than that of DSSCs with a TiO2/TiO2 photoanode (6.84%), which is attributed to the bi-function effects of TiO2:Yb3+/Tm3+/Mn2+ including the conversion of NIR into visible light and improved light scattering. An increased charge transfer resistance of the photoanode/electrolyte interface indicates the suppressed charge recombination of electrons with the electrolyte redox couple (I/I3) in DSSCs with a TiO2/TiO2:Yb3+/Tm3+/Mn2+ double-layered photoanode, which also contributes to the enhanced performance of DSSCs. The double-layered photoanode fabricated by bi-function TiO2:Yb3+/Tm3+/Mn2+ nanospheres will provide a promising avenue for moving DSSCs forward to meet practical applications. Full article
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