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Applied Sciences
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Emerging Functional Devices and Advanced Photovoltaic Cells
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Emerging Functional Devices and Advanced Photovoltaic Cells

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

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 8971

Special Issue Editor

Prof. Dr. Joondong Kim

E-Mail Website
Guest Editor
Department of Electrical Engineering, Incheon National University, 119 Academy Rd., Yeonsu, Incheon 22012, Korea
Interests: photovoltaic photovoltaics; transparent conductors; neuromorphic device; 2D materials; metal oxide optoelectronics; solar cells; photoelectric applications

Special Issue Information

Dear Colleagues,

Researchers have tried to alternate the conventional and addictive fossil fuels to the renewable energy methods. Due to the limit of fossil energy-resources, human beings have been expected to encounter the energy shortage in future. However, developing, actually allowing the use of shale oil resources, the human beings may not entered the stage of oil shortage in the near future. But we know the fossil fuel is not permanent and causes the inevitable global warming and degrades the air quality.

Sustainable energy is ultimately desirable and clean method is highly required.

We may resolve the issue by developing high-efficient photovoltaic (PV) cells and functional photoelectric devices. High-performing efficiency of solar cells can accelerate their competition in market. Moreover neo-concept of photovoltaics cells will induce the appearance of new needs, such as transparent PV cells.

Transparent photovoltaic (TPV) device is the solar cell having high transparency in the visible-range light. And thus, human beings may not recognize the existence of TPV entities but the electric energy is generated through the invisible power generator. This kind of invisible TPV may open a new era for on-demand energy supplying system, by being applied in windows of cell phones, displays, vehicles, and buildings.

Various approaches are undertaking for the high-performing solar cells and functional electric devices. Dealing of electrical and optical aspects, different types of issues are considerable, including, junction processes, heterojunction structures, tandem designs, light management designs, and functional material adoptions and so on. This special issue covers the neo-concept designs and suggestions for photovoltaics cells, photoelectric devices and functional devices for energy applications.

Prof. Dr. Joondong Kim
Guest Editor

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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • Emerging photoelectric devices
  • Photovoltaics
  • Solar cells
  • Transparent solar cells
  • Tandem solar cells
  • Silicon
  • GaAs
  • Semiconductor
  • Heterojunction
  • Quantum dots
  • Nanostructures
  • Transparent electrodes
  • Transparent conductive oxide
  • Metal oxide
  • 2D materials
  • Functional devices

Published Papers (3 papers)

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Research

9 pages, 1753 KiB  
Article
Neuromorphic Spatiotemporal Information Processing Using Neuro-Photodetector Systems
by Mohit Kumar and Joondong Kim
Appl. Sci. 2020, 10(23), 8358; https://doi.org/10.3390/app10238358 - 25 Nov 2020
Cited by 3 | Viewed by 2251
Abstract
Spatiotemporal information processing within the human brain is done by a joint task of neurons and synapses with direct optical inputs. Therefore, to mimic this neurofunction using photonic devices could be an essential step to design future artificial visual recognition and memory storage [...] Read more.
Spatiotemporal information processing within the human brain is done by a joint task of neurons and synapses with direct optical inputs. Therefore, to mimic this neurofunction using photonic devices could be an essential step to design future artificial visual recognition and memory storage systems. Herein, we proposed and developed a proof-of-principle two-terminal device that exhibits key features of neuron (integration, leaky, and relaxation) and synapse (short- and long-term memory) together in response with direct optical input stimuli. Importantly, these devices with processing and memory features, are further effectively integrated to build an artificial neural network, which are enabled to do neuromorphic spatiotemporal image sensing. Our approach provides a simple but effective route to implement for an artificial visual recognition system, which also has applications in edge computing and the internet of things. Full article
(This article belongs to the Special Issue Emerging Functional Devices and Advanced Photovoltaic Cells)
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12 pages, 2639 KiB  
Article
High-Quality ITO/Al-ZnO/n-Si Heterostructures with Junction Engineering for Improved Photovoltaic Performance
by Chong Tong, Manjeet Kumar, Ju-Hyung Yun, Joondong Kim and Sung Jin Kim
Appl. Sci. 2020, 10(15), 5285; https://doi.org/10.3390/app10155285 - 30 Jul 2020
Cited by 3 | Viewed by 2619
Abstract
A heterostructure of Sn-doped In2O3 (ITO)/Al-doped ZnO (AZO)/n-Si was proposed and studied for photovoltaics. The top ITO worked as a transparent conducting layer for excellent optical transparency and current collection. The AZO/n-Si served as the active junction and provided the [...] Read more.
A heterostructure of Sn-doped In2O3 (ITO)/Al-doped ZnO (AZO)/n-Si was proposed and studied for photovoltaics. The top ITO worked as a transparent conducting layer for excellent optical transparency and current collection. The AZO/n-Si served as the active junction and provided the built-in potential (qVbi) for the photovoltaic devices. To achieve a higher open circuit voltage (Voc), which is the main challenge for AZO/Si heterojunctions due to the junction interfacial defects, the AZO and AZO/Si junction properties were systematically investigated. By modulating the Al doping in the AZO thin films via a dual beam co-sputtering technique, the AZO/n-Si junction quality was significantly improved with qVbi increased from 0.21 eV to 0.74 eV. As a result, the Voc of our best device was enhanced from 0.14 V to 0.42 V, with a short circuit current (Jsc) of 26.04 mA/cm2 and a conversion efficiency (Eff) of 5.03%. To our best knowledge, this is the highest Voc reported for ZnO/Si heterojunctions prepared by the sputtering method. The results confirmed the validity of our proposed structure and junction engineering approach and provided new insights and opportunities for ZnO/Si heterojunction optoelectronics. Full article
(This article belongs to the Special Issue Emerging Functional Devices and Advanced Photovoltaic Cells)
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9 pages, 3198 KiB  
Article
Effects of Laser Doping on the Formation of the Selective Emitter of a c-Si Solar Cell
by Jeong Eun Park, Won Seok Choi, Jae Joon Jang, Eun Ji Bae and Donggun Lim
Appl. Sci. 2020, 10(13), 4554; https://doi.org/10.3390/app10134554 - 30 Jun 2020
Cited by 4 | Viewed by 3657
Abstract
Laser doping, though able to improve cell characteristics, enables the formation of a selective emitter without the need for additional processing. Its parameters should be investigated to minimize laser defects, such as the heat-affected zone (HAZ), and to obtain a low contact resistance. [...] Read more.
Laser doping, though able to improve cell characteristics, enables the formation of a selective emitter without the need for additional processing. Its parameters should be investigated to minimize laser defects, such as the heat-affected zone (HAZ), and to obtain a low contact resistance. Herein, the laser fluence and speed were changed to optimize process conditions. Under a laser fluence of 1.77 J/cm2 or more, the surface deteriorated due to the formation of the HAZ during the formation of the laser doping selective emitter (LDSE). The HAZ prevented the formation of the LDSE and impaired cell characteristics. Therefore, the laser speeds were changed from 10 to 70 mm/s. The lowest contact resistivity of 1.8 mΩ·cm2 was obtained under a laser fluence and speed of 1.29 J/cm2 and 10 mm/s, respectively. However, the surface had an irregular structure due to the melting phenomenon, and many by-products were formed. This may have degraded the efficiency due to the increased contact reflectivity. Thus, we obtained the lowest contact resistivity of 3.42 mΩ·cm2, and the damage was minimized under the laser fluence and speed of 1.29 J/cm2 and 40 mm/s, respectively. Full article
(This article belongs to the Special Issue Emerging Functional Devices and Advanced Photovoltaic Cells)
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