Special Issue "Organic/Metal Oxide Thin Films for Optoelectronic/Photovoltaic and Sensing Applications"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Materials for Energy Applications".

Deadline for manuscript submissions: 30 June 2022.

Special Issue Editors

Dr. Mir Waqas Alam
E-Mail Website
Guest Editor
Department of Physics, College of Science, King Faisal University, Ahsaa 31982, Saudi Arabia
Interests: organic materials; inorganic materials; thin films; optoelectronic devices; gas sensors; photovoltaic devices; energy applications
Dr. Sajid Ali Ansari
E-Mail Website
Guest Editor
Department of Physics, College of Science, King Faisal University, P.O. Box 400, Hofuf, Al-Ahsa 31982, Saudi Arabia
Interests: electrochemical supercapacitors; photocatalysis, energy storage; energy materials; Li ion battery; fuel cells
Special Issues, Collections and Topics in MDPI journals
Dr. Faheem Ahmed
E-Mail Website
Guest Editor
Department of Physics, College of Science, King Faisal University, P.O. Box-400, Al-Ahsa 31982, Saudi Arabia
Interests: nanostructures; energy; sensing; photocatalysis; batteries; supercapacitors; solar cells; nanomedicines
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Thin films based on metal oxides and organic materials are among the key materials used in photovoltaic/optoelectronic and sensing devices. Thin films based on these materials are often used in devices such as thin-film transistors, solar cells, light-emitting diodes, photoconductors, light crystal displays, and sensors. Due to the large-scale effort from the engineering and science community, progress in these devices has rapidly increased over the past few decades. These devices are generally composed of single or multiple thin layers; therefore, charge transfer is considered to be a serious challenge. Several interfaces of engineering methods have been used to improve the performance of these devices. With the passage of time, different materials/fabrication processes and different techniques have been explored, and research efforts  for innovations and performance improvement are continuing. Considering the importance of organic and inorganic thin films and their applications, this Special Issue aims to provide a comprehensive collection of research from across the world that can be used for the development of advanced devices based on organic/metal oxide thin films.

Dr. Mir Waqas Alam
Dr. Sajid Ali Ansari
Dr. Faheem Ahmed
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • organic materials
  • inorganic metal oxides
  • thin films
  • thin film transistors
  • energy devices
  • photovoltaics
  • sensors

Published Papers (3 papers)

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Research

Article
Green Synthesis of Ni-Cu-Zn Based Nanosized Metal Oxides for Photocatalytic and Sensor Applications
Crystals 2021, 11(12), 1467; https://doi.org/10.3390/cryst11121467 - 26 Nov 2021
Viewed by 216
Abstract
The preparation, characterization, and application of Nickel oxide (NiO)–Copper oxide (CuO)–Zinc oxide (ZnO) transition nanometal oxides have significantly enhanced their tunable properties for superior multifunctional performances compared with well-known metal oxides. NiO–CuO–ZnO nano transition metal oxides were synthesized by a simple eco-friendly solution [...] Read more.
The preparation, characterization, and application of Nickel oxide (NiO)–Copper oxide (CuO)–Zinc oxide (ZnO) transition nanometal oxides have significantly enhanced their tunable properties for superior multifunctional performances compared with well-known metal oxides. NiO–CuO–ZnO nano transition metal oxides were synthesized by a simple eco-friendly solution combustion method. X-ray diffraction studies revealed distinct phases such as monoclinic, cubic, and hexagonal wurtzite for CuO, NiO, and ZnO, respectively, with NiO having the highest composition. The particle sizes were found to be in the range between 25 and 60 nm, as determined by powder X-ray diffraction. The energy bandgap values were found to be 1.63, 3.4, and 4.2 eV for CuO, ZnO, and NiO, respectively. All metal oxides exhibited a moderate degradation efficiency for AR88 dye. The results of ultraviolet–visible absorption spectra helped identify the bandgap of metal oxides and a suitable wavelength for photocatalytic irradiation. Finally, we concluded that the electrochemical studies revealed that the synthesized materials are well suitable for sensor applications. Full article
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Article
Investigation of TiO2 Nanoparticles Synthesized by Sol-Gel Method for Effectual Photodegradation, Oxidation and Reduction Reaction
Crystals 2021, 11(12), 1456; https://doi.org/10.3390/cryst11121456 - 25 Nov 2021
Viewed by 226
Abstract
Metal oxide titanium dioxide (TiO2) nanoparticles were synthesized by using a simple and economical sol-gel method. The prepared nanoparticles were used to evaluate methylene blue dye degradation and as catalysts in the oxidation of benzaldehyde. The crystallite size of the titanium [...] Read more.
Metal oxide titanium dioxide (TiO2) nanoparticles were synthesized by using a simple and economical sol-gel method. The prepared nanoparticles were used to evaluate methylene blue dye degradation and as catalysts in the oxidation of benzaldehyde. The crystallite size of the titanium dioxide nanoparticle was 18.3 nm, which was confirmed by X-ray diffraction analysis. The spherical morphology was confirmed by scanning electron microscopy (SEM), and the elemental composition of the nanoparticle was found by energy dispersive X-ray (EDAX) analysis. The anatase form of the nanoparticle was confirmed by the bandgap 3.2 eV, which was measured using UV–DRS analysis. The bond between metal and oxygen was confirmed by the peaks at 485 and 606 cm–1 analyzed by Fourier transform infrared analysis (FTIR). The efficiency of the catalyst in dye degradation was 60.08, 68.38, and 80.89% with respect to 50, 75, and 100 mg catalyst weight. The yield % of benzoic acid was 94%, and the reduction efficiency against 4-nitrophenol was 98.44%. Full article
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Article
Study and Analysis of Simple and Precise of Contact Resistance Single-Transistor Extracting Method for Accurate Analytical Modeling of OTFTs Current-Voltage Characteristics: Application to Different Organic Semiconductors
Crystals 2021, 11(12), 1448; https://doi.org/10.3390/cryst11121448 - 24 Nov 2021
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Abstract
Contact resistance (Rc) characterizes the interface of source-drain electrodes/organic semiconductors and controls the injection efficiency of carriers in organic thin-film transistors (OTFTs). This research paper presents and assesses two methods for extracting the value of the contact resistance from the [...] Read more.
Contact resistance (Rc) characterizes the interface of source-drain electrodes/organic semiconductors and controls the injection efficiency of carriers in organic thin-film transistors (OTFTs). This research paper presents and assesses two methods for extracting the value of the contact resistance from the measured current-voltage characteristics of OTFTs made with various p-type organic semiconductors as active layers. These two methods are the transition voltage method (TVM) and the transfer line method (TLM). The obtained Rc values by the TVM method are in fair agreement with those obtained by TLM, with a maximum percentage of difference around 10%, demonstrating the accuracy of the used transition-voltage method. An analytical model was employed to calculate output characteristics in the linear regime of OTFTs made with various organic semiconductors using the contact resistance values obtained by the transition voltage method. The calculated results are in reasonably good agreement with the experimental ones of each fabricated device, which affirms the ability of the used model to characterize the charge transport correctly in these types of devices. It can be concluded that the used TVM method is not only an easy and practical method, but also a precise way for extracting Rc in OTFTs produced using different organic semiconductor materials. Full article
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