Special Issue "Nanostructured Photodetectors and Photovoltaic Devices"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (31 December 2017)

Special Issue Editors

Guest Editor
Prof. Dr. Shoou-Jinn Chang

Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Website | E-Mail
Interests: optical and electronic devices, semi-conductive materials, nanotechnology
Guest Editor
Prof. Dr. Teen­Hang Meen

Chair of IEEE Tainan Section Sensors Council Department of Electronic Engineering National Formosa University, Yunlin 632
Website | E-Mail
Interests: photovoltaic device; dye-sensitized solar cells; nanotechnology
Guest Editor
Dr. Stephen D. Prior

Aeronautics, Astronautics and Computational Engineering, University of Southampton, Southampton SO16 7QF, UK
Website | E-Mail
Interests: microsystem design; nanotechnology

Special Issue Information

Dear Colleagues,

Nanomaterials, which provide one of the greatest potentials for improving the performance and extended capabilities of products in a number of industrial sectors, are a new class of materials, having dimensions in the 1~100 nm range. Nanostructures can be divided into zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D) based on their shapes. The recent emphasis in the nanomaterials research is put on 1D nanostructures at the expense of 0D and 2D ones, perhaps due to the intriguing possibility of using them in a majority of short-term future applications. The most successful examples are seen in the microelectronic devices, where ‘‘smaller’’ have always meant a greater performance ever since the invention of transistors; for example, a higher density of integration, faster response, lower cost, and less power consumption.

In recent years, applications of nanomaterials on photodetectors and photovoltaic devices have been highly developing fields, due to the flexibility and light weight for daily use, which have the potential to be deployable. Therefore, the fields of nanostructure devices have been the subject of reviews. Thus, we invite investigators to contribute original research articles, as well as review articles, that will stimulate the continuing efforts to understand the photodetectors and photovoltaic devices with nanostructure. Potential topics include, but are not limited to:

  • Fabrications and properties of photodetectors and photovoltaic devices

  • Preparation and applications of nanostructures (nanoparticles, nanowires, nanosheets, etc.)

  • Recent development on nanostructures with new optical and photoelectric properties

  • Processing techniques of nanostructures for photodetectors and photovoltaic devices

  • Nanostructures for electro-optical applications

Prof. Dr. Shoou-Jinn Chang
Prof. Dr. Teen-Hang Meen
Dr. Stephen D. Prior
Guest Editors

Manuscript Submission Information

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Keywords

  • Nanomaterials and nanostructured

  • Photodetectors

  • Photovoltaic devices

Published Papers (3 papers)

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Research

Open AccessArticle
Trade-off between Photon Management Efficacy and Material Quality in Thin-Film Solar Cells on Nanostructured Substrates of High Aspect Ratio Structures
Appl. Sci. 2018, 8(4), 616; https://doi.org/10.3390/app8040616
Received: 12 January 2018 / Revised: 14 February 2018 / Accepted: 18 February 2018 / Published: 13 April 2018
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Abstract
Although texturing of the transparent electrode of thin-film solar cells has long been used to enhance light absorption via light trapping, such texturing has involved low aspect ratio features. With the recent development of nanotechnology, nanostructured substrates enable improved light trapping and enhanced [...] Read more.
Although texturing of the transparent electrode of thin-film solar cells has long been used to enhance light absorption via light trapping, such texturing has involved low aspect ratio features. With the recent development of nanotechnology, nanostructured substrates enable improved light trapping and enhanced optical absorption via resonances, a process known as photon management, in thin-film solar cells. Despite the progress made in the development of photon management in thin-film solar cells using nanostructures substrates, the structural integrity of the thin-film solar cells deposited onto such nanostructured substrates is rarely considered. Here, we report the observation of the reduction in the open circuit voltage of amorphous silicon solar cells deposited onto a nanostructured substrate with increasing areal number density of high aspect ratio structures. For a nanostructured substrate with the areal number density of such nanostructures increasing in correlation with the distance from one edge of the substrate, a correlation between the open circuit voltage reduction and the increase of the areal number density of high aspect ratio nanostructures of the front electrode of the small-size amorphous silicon solar cells deposited onto different regions of the substrate with graded nanostructure density indicates the effect of the surface morphology on the material quality, i.e., a trade-off between photon management efficacy and material quality. This observed trade-off highlights the importance of optimizing the morphology of the nanostructured substrate to ensure conformal deposition of the thin-film solar cell. Full article
(This article belongs to the Special Issue Nanostructured Photodetectors and Photovoltaic Devices)
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Open AccessArticle
Oxygen Vacancy-Mediated ZnO Nanoparticle Photocatalyst for Degradation of Methylene Blue
Appl. Sci. 2018, 8(3), 353; https://doi.org/10.3390/app8030353
Received: 4 December 2017 / Revised: 9 January 2018 / Accepted: 14 January 2018 / Published: 28 February 2018
Cited by 10 | PDF Full-text (5940 KB) | HTML Full-text | XML Full-text
Abstract
ZnO nanoparticles (NPs) are synthesized by deoxidizing ZnO powder in a vacuum drying process. This process reduces the size of the NPs and increases the concentration of oxygen vacancies on their surfaces. ZnO NPs with sufficient oxygen vacancies are highly effective for the [...] Read more.
ZnO nanoparticles (NPs) are synthesized by deoxidizing ZnO powder in a vacuum drying process. This process reduces the size of the NPs and increases the concentration of oxygen vacancies on their surfaces. ZnO NPs with sufficient oxygen vacancies are highly effective for the photodecomposition of methylene blue (MB) dye in water under ultraviolet irradiation. The MB degradation efficiency exceeds 99 percent after 50 min of light irradiation, and the catalytic property of the NPs remains stable over several complete degradation cycles. It is revealed that the concentration of oxygen vacancies on the surface, and the photocatalytic activity, are both higher for smaller NPs. Oxygen vacancies reduce the recombination rate of photo-generated charge carriers by capturing the electrons and hence, improve the efficiency of redox reactions. In addition, a smaller particle size leads to a larger specific surface area and a higher photonic efficiency for the ZnO NPs. Full article
(This article belongs to the Special Issue Nanostructured Photodetectors and Photovoltaic Devices)
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Open AccessArticle
All-Carbon Electrodes for Flexible Solar Cells
Appl. Sci. 2018, 8(2), 152; https://doi.org/10.3390/app8020152
Received: 16 December 2017 / Revised: 8 January 2018 / Accepted: 20 January 2018 / Published: 23 January 2018
Cited by 3 | PDF Full-text (1663 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Transparent electrodes based on carbon nanomaterials have recently emerged as new alternatives to indium tin oxide (ITO) or noble metal in organic photovoltaics (OPVs) due to their attractive advantages, such as long-term stability, environmental friendliness, high conductivity, and low cost. However, it is [...] Read more.
Transparent electrodes based on carbon nanomaterials have recently emerged as new alternatives to indium tin oxide (ITO) or noble metal in organic photovoltaics (OPVs) due to their attractive advantages, such as long-term stability, environmental friendliness, high conductivity, and low cost. However, it is still a challenge to apply all-carbon electrodes in OPVs. Here, we report our efforts to develop all-carbon electrodes in organic solar cells fabricated with different carbon-based materials, including carbon nanotubes (CNTs) and graphene films synthesized by chemical vapor deposition (CVD). Flexible and semitransparent solar cells with all-carbon electrodes are successfully fabricated. The best power conversion efficiency achieved for the devices with all-carbon electrodes is 0.63%, comparable to the reported performance of OPVs using pristine CVD graphene films as anodes on rigid substrates (glass). Moreover, the current densities of as-obtained devices are comparable to those assembled with all-carbon active layers and standard electrodes (e.g., ITO and metal), which indicates that the all-carbon electrodes made of CNT and graphene films are suitably effective for carrier collection and extraction. Our results present the feasibility and potential of applying all-carbon electrodes based on graphitic nanomaterials in next-generation carbon-based photovoltaics. Full article
(This article belongs to the Special Issue Nanostructured Photodetectors and Photovoltaic Devices)
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