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Crystals, Volume 12, Issue 5

May 2022 - 184 articles

Cover Story: Organic ultraviolet (UV) phototransistors are promising for diverse applications. However, wide-bandgap organic semiconductors (OSCs) with intense UV absorption tend to exhibit a large contact resistance (Rc) because of energy level mismatching with metal electrodes. Herein, we discovered that a molecular dopant of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) was more efficient than a transition metal oxide dopant of MoO3 in doping a wide-bandgap OSC, although the former showed a smaller electron affinity (EA). By efficient contact doping, a low Rc of 889 Ω·cm and a high mobility of 13.89 cm2V−1s−1 were achieved. As a result, UV-sensitive phototransistors showed high photosensitivity and responsivity. View this paper
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Articles (184)

  • Article
  • Open Access
8 Citations
2,918 Views
16 Pages
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Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys

  • Metin Kayitmazbatir,
  • Huai-Hsun Lien,
  • Jyoti Mazumder,
  • Jian Wang and
  • Amit Misra
Crystals2022, 12(5), 750;https://doi.org/10.3390/cryst12050750

23 May 2022

Laser Surface Remelting (LSR) was applied to arc-melted Al-20Si-0.2Sr, Al-20Si-0.2Ce, and Al-20Si hypereutectic alloys to refine microstructures. Experiments revealed that microstructures in the melt pool varied from fully eutectic to a mixture of Al...

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  • Article
  • Open Access
6 Citations
2,486 Views
15 Pages
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Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water

  • Tong Zhang,
  • Tong Li,
  • Jinlin Lu,
  • Qi Guo and
  • Jian Xu
Crystals2022, 12(5), 749;https://doi.org/10.3390/cryst12050749

23 May 2022

The clogging behavior of the micro-orifice under a flow accelerated condition was investigated after 500 h of immersion in high-temperature water. The results indicated the residual area of the micro-orifice was reduced to one-third of its original s...

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  • Editorial
  • Open Access
4 Citations
2,548 Views
3 Pages
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Additive Manufacturing: Materials, Processing, Characterization and Applications

  • Pan Wang,
  • Takayoshi Nakano and
  • Jiaming Bai
Crystals2022, 12(5), 747;https://doi.org/10.3390/cryst12050747

23 May 2022

The current Special Issue collected 19 original articles reporting the results of theoretical and experimental studies that provide new insights into this fascinating new generation manufacturing process, additive manufacturing (AM) [...]

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  • Article
  • Open Access
6 Citations
2,912 Views
12 Pages
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Effect of Laser Surface Structuring on Surface Wettability and Tribological Performance of Bulk Metallic Glass

  • Qinghua Wang,
  • Yongqi Zhou,
  • Pengyu Wu,
  • Chengyu Qu and
  • Huixin Wang
Crystals2022, 12(5), 748;https://doi.org/10.3390/cryst12050748

23 May 2022

Bulk metallic glasses (BMGs) have been extremely popular in recent decades, owing to their superior properties. However, how to improve the surface functions and durability of BMGs has always been a key engineering issue. In this work, a facile laser...

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  • Article
  • Open Access
10 Citations
2,812 Views
11 Pages
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Improved Optoelectronic Characteristics of Ga-In co-Doped ZnO UV Photodetectors by Asymmetric Metal Contact Structure

  • Chien-Yie Tsay,
  • Hsuan-Meng Tsai and
  • Yun-Chi Chen
Crystals2022, 12(5), 746;https://doi.org/10.3390/cryst12050746

23 May 2022

Transparent Ga and In co-doped ZnO (ZnO:Ga-In) semiconductor thin films were deposited on Corning glass substrates by the sol-gel spin-coating process. The ZnO:Ga-In thin films were used as the sensing layer of metal–semiconductor–metal (...

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  • Article
  • Open Access
2 Citations
2,826 Views
12 Pages
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Effects of n-Al2O3 and μ-TiCN on Microstructure and Mechanical Properties of Al2O3 Composite Ceramics Manufactured by Material Extrusion and Photo-Polymerization Combined Process

  • Xin He,
  • Jie Xu and
  • Weixi Ji
Crystals2022, 12(5), 745;https://doi.org/10.3390/cryst12050745

23 May 2022

Alumina (Al2O3) composite ceramics with different composition ratio and particle-size distribution were fabricated by the material extrusion and photo-polymerization combined process (MEX-PPM) based on additive-manufacturing (AM) technology in our pr...

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  • Review
  • Open Access
20 Citations
5,299 Views
15 Pages
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ZnO under Pressure: From Nanoparticles to Single Crystals

  • Andrei N. Baranov,
  • Petr S. Sokolov and
  • Vladimir L. Solozhenko
Crystals2022, 12(5), 744;https://doi.org/10.3390/cryst12050744

23 May 2022

In the present review, new approaches for the stabilization of metastable phases of zinc oxide and the growth of ZnO single crystals under high pressures and high temperatures are considered. The problems of the stabilization of the cubic modificatio...

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  • Article
  • Open Access
7 Citations
4,787 Views
20 Pages
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Statistical Analysis of the Distribution of the Schmid Factor in As-Built and Annealed Parts Produced by Laser Powder Bed Fusion

  • Amos Muiruri,
  • Maina Maringa and
  • Willie du Preez
Crystals2022, 12(5), 743;https://doi.org/10.3390/cryst12050743

23 May 2022

This study documents a systematic analysis of the global Schmid factor for different deformation mechanisms in α′/α and β-grains in different forms of direct metal laser sintered (DMLS) Ti6Al4V(ELI) based on EBSD data. A novelt...

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  • Article
  • Open Access
3,203 Views
11 Pages
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Controlled Synthesis and Photoresponsive Properties of Spiropyran End-Functionalized Poly(vinyl ether)s

  • Jin Motoyanagi,
  • Ayane Fujishima and
  • Masahiko Minoda
Crystals2022, 12(5), 742;https://doi.org/10.3390/cryst12050742

22 May 2022

Due to the need to develop smart materials for a variety of applications such as catalysts and drug delivery, the development of photoresponsive polymers is receiving increasing attention. In particular, the photoisomerization of spiropyran (SP), unl...

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  • Article
  • Open Access
16 Citations
2,475 Views
10 Pages
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Co (II) Complexes Based on the Bis-Pyrazol-S-Triazine Pincer Ligand: Synthesis, X-ray Structure Studies, and Cytotoxic Evaluation

  • Heba M. Refaat,
  • Atallh A. M. Alotaibi,
  • Necmi Dege,
  • Ayman El-Faham and
  • Saied M. Soliman
Crystals2022, 12(5), 741;https://doi.org/10.3390/cryst12050741

20 May 2022

Four pincer-type Co (II) complexes of the 2,4-bis (3,5-dimethyl-1H-pyrazol-1-yl)-6-methoxy-1,3,5-triazine ligand (L) were evaluated for their cytotoxic activities against lung and breast cancer cell lines using cell viability assay. The X-ray single...

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