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Thin Films and Heterostructures for Optoelectronics
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Thin Films and Heterostructures for Optoelectronics

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

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 2278

Special Issue Editors

Dr. Carmen Lǎzǎu

E-Mail Website
Guest Editor
National Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara, Dr. A.P. Podeanu No.144, 300569 Timisoara, Romania
Interests: thin films; hydrothermal methods; nanomaterials synthesis; heterojunctions for sensors development; composite structures; physical chemistry characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Cornelia Bandas

E-Mail Website
Guest Editor
National Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. P. Podeanu 144, 300569 Timisoara, Romania
Interests: materials; nanomaterials synthesis; composite structures; physical chemistry characterization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We invite you to submit your work dedicated to recent and current research in the field of thin films to this Special Issue on "Thin Films and Heterostructures for Optoelectronics". Over the last several decades, nanomaterials—especially semiconductors—have made great advances in the development of optoelectronics. The main focus has been directed to methods for the fabrication of several types of heterojunctions, such as organic–organic, organic–inorganic and inorganic–inorganic. These types of heterostructures/heterojunctions with new or enhanced optical and electrical properties are used in the development of optoelectronic devices, such as solar cells, photodetectors and light-emitting diodes. The aim of this Special Issue is to publish high-quality research papers addressing current and future advances on the preparation and characterization of thin films and optoelectronics devices.

In particular, the topics of interest for this Special Issue include, but are not limited to:

  • Nanostructured materials for optoelectronics applications;
  • Functional thin films and heterostructures (including deposition techniques and technology)
  • Design and synthesis of thin films/heterostructures;
  • Interface phenomena in oxide heterostructures;
  • Physico-chemical and electrical characterizations.

Dr. Carmen Lǎzǎu
Dr. Cornelia Bandas
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 submissions that pass pre-check are 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. Coatings 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 2600 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

  • thin films
  • heterostructures
  • optoelectronics devices
  • semiconductors

Published Papers (2 papers)

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Research

12 pages, 6516 KiB  
Article
Surface Photovoltage Method for Photovoltaic Quality Control of GaAs-Based Solar Cells
by Vesselin Donchev and Malina Milanova
Coatings 2023, 13(12), 2052; https://doi.org/10.3390/coatings13122052 - 7 Dec 2023
Viewed by 927
Abstract
In this paper, we demonstrate the potential of the contactless surface photovoltage (SPV) method for fast and reliable control of GaAs-based solar cells directly on epitaxial heterostructures before metallization and photolithography processes. The magnitude of the SPV corresponds to the generated photovoltage in [...] Read more.
In this paper, we demonstrate the potential of the contactless surface photovoltage (SPV) method for fast and reliable control of GaAs-based solar cells directly on epitaxial heterostructures before metallization and photolithography processes. The magnitude of the SPV corresponds to the generated photovoltage in the photoactive region, which is related to the open circuit voltage of the cell. The focus of this investigation is the potential of dilute nitride compounds grown by low-temperature liquid-phase epitaxy (LPE) for application as intermediate cells in multijunction solar cells. First, SPV spectroscopy is used to determine the photosensitivity spectral range and bandgap of the grown dilute nitride compound layers. Further, the photovoltaic quality of the grown solar cell heterostructures is evaluated by comparing the magnitude of their SPV signals with that of a reference GaAs solar cell. A drastic reduction in the measured SPV is observed for nitrogen-containing solar cell structures, which correlates with the lowering of solar cell open-circuit voltage values measured under standard test conditions. Finally, solar cell structures based on nitrogen-free GaAsSb compounds with the same long-wavelength photosensitivity limit as GaAsSbN are grown by LPE. They show one order of magnitude higher SPV signal and, therefore, have a great potential for solar cell application. Full article
(This article belongs to the Special Issue Thin Films and Heterostructures for Optoelectronics)
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17 pages, 4291 KiB  
Article
Development of Hybrid Electrodes Based on a Ti/TiO2 Mesoporous/Reduced Graphene Oxide Structure for Enhanced Electrochemical Applications
by Cornelia Bandas, Mina Ionela Popescu, Corina Orha, Mircea Nicolaescu, Aniela Pop and Carmen Lazau
Coatings 2023, 13(8), 1359; https://doi.org/10.3390/coatings13081359 - 3 Aug 2023
Cited by 1 | Viewed by 950
Abstract
Titanium/TiO2 mesoporous/reduced graphene oxide structure for construction of a hybrid electrode was successfully developed using a facile and effective spin-coating technique. The as-prepared structures were characterized using ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, RAMAN analysis, scanning electron microscopy (SEM) [...] Read more.
Titanium/TiO2 mesoporous/reduced graphene oxide structure for construction of a hybrid electrode was successfully developed using a facile and effective spin-coating technique. The as-prepared structures were characterized using ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, RAMAN analysis, scanning electron microscopy (SEM) coupled with elemental analysis (EDX), and atomic force microscopy (AFM). In addition, the electrochemical behavior was assessed by cyclic voltammetry (CV) in a 1M KNO3 supporting electrolyte and in the presence of 4 mM K3Fe(CN)6 to determine the electroactive surface area and apparent diffusion coefficient of the hybrid electrode. The charge transfer resistance was investigated via electrochemical impedance spectroscopy (EIS) in a 0.1 M Na2SO4 supporting electrolyte to confirm the role of reduced graphene oxide on the electrode’s surface. The potential application of as-obtained hybrid electrodes in electroanalysis was tested through cyclic voltammetry in the presence of doxorubicin as the target analyte, in the concentration range between 1 to 7 mg L−1 DOX. By using mesoporous TiO2 with a high specific surface area (~140 m2 g−1) in the synthesis of the composite material based on a Ti/TiO2(Ms)/rGO hybrid structure, was obtained a 2.3-times increase in electroactive surface area than the geometrical surface area of the hybrid electrode. These results provide new insights into the development of high-performance and cost-effective electrochemical sensors based on reduced graphene oxide films on metallic structures for applications in the detection processes of drugs from wastewater. Full article
(This article belongs to the Special Issue Thin Films and Heterostructures for Optoelectronics)
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