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Crystals
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Organic Photovoltaic
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Organic Photovoltaic

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Organic Crystalline Materials".

Deadline for manuscript submissions: closed (30 September 2020) | Viewed by 8123

Special Issue Editors

Prof. Dr. Hyeok Kim

E-Mail Website
Guest Editor
School of of Electrical and Computer Engineering, University of Seoul, Seoul, Korea
Interests: organic electronics; energy harvesting
Prof. Dr. Jin-Hyuk Bae

E-Mail Website
Guest Editor
Kyungpook National University, Daegu, South Korea
Interests: flexible and transparent electronics; energy harvesting

Special Issue Information

Dear Colleagues,

Organic photovoltaic devices, which convert photon to electron in electricity, are in line with the development of highly functional material synthesis and device optimization. These newly suggested materials and device schemes have contributed to improving photovoltaic performance in organic photovoltaic devices, with a power conversion efficiency of above 17% for each ray of sunlight, which is a record high. For the last three decades, those efforts have made organic photovoltaic devices (OPVs) viable with a comparably cost-effective advantage similar to that of inorganic photovoltaics (PVs). For these low-cost PVs to continue to evolve, crucial development is required, such as stability against efficiency degradation, a fabrication technique for modules in a large area, several more excavation applications in indoor PVs to power wireless sensor networks (WSN) in a smart home, or portable power sources. To fulfill these requirements, OPVs still need to be improved in terms of spectral match, low energy loss, and fill factor. In this regard, there is plenty of room for contributions to commercialize OPVs.

We encourage our colleagues to submit their work concerning realization of OPVs into a viable market.

Prof. Dr. Hyeok Kim
Prof. Dr. Jin-Hyuk Bae
Guest Editors

Manuscript Submission Information

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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 2100 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
  • Efficiency
  • Solar cell
  • Semiconductor
  • Flexible
  • Green energy

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Published Papers (2 papers)

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Research

12 pages, 3941 KiB  
Article
Polyethylenimine-Ethoxylated Interfacial Layer for Efficient Electron Collection in SnO2-Based Inverted Organic Solar Cells
by Ikram Anefnaf, Safae Aazou, Guy Schmerber, Siham Refki, Nicolas Zimmermann, Thomas Heiser, Gérald Ferblantier, Abdelilah Slaoui, Aziz Dinia, Mohammed Abd-Lefdil and Zouheir Sekkat
Crystals 2020, 10(9), 731; https://doi.org/10.3390/cryst10090731 - 20 Aug 2020
Cited by 13 | Viewed by 4831
Abstract
In this work, we studied inverted organic solar cells based on bulk heterojunction using poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C71-butyric acid methyl ester (P3HT:PCBM) as an active layer and a novel cathode buffer bilayer consisting of tin dioxide (SnO2) combined with polyethylenimine-ethoxylated (PEIE) to overcome the [...] Read more.
In this work, we studied inverted organic solar cells based on bulk heterojunction using poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C71-butyric acid methyl ester (P3HT:PCBM) as an active layer and a novel cathode buffer bilayer consisting of tin dioxide (SnO2) combined with polyethylenimine-ethoxylated (PEIE) to overcome the limitations of the single cathode buffer layer. The combination of SnO2 with PEIE is a promising approach that improves the charge carrier collection and reduces the recombination. The efficient device, which is prepared with a cathode buffer bilayer of 20 nm SnO2 combined with 10 nm PEIE, achieved Jsc = 7.86 mA/cm2, Voc = 574 mV and PCE = 2.84%. The obtained results exceed the performances of reference solar cell using only a single cathode layer of either SnO2 or PEIE. Full article
(This article belongs to the Special Issue Organic Photovoltaic)
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13 pages, 2732 KiB  
Article
Theoretical Study of a Class of Organic D-π-A Dyes for Polymer Solar Cells: Influence of Various π-Spacers
by Nguyen Van Trang, Tran Ngoc Dung, Ngo Tuan Cuong, Le Thi Hong Hai, Daniel Escudero, Minh Tho Nguyen and Hue Minh Thi Nguyen
Crystals 2020, 10(3), 163; https://doi.org/10.3390/cryst10030163 - 2 Mar 2020
Cited by 9 | Viewed by 2726
Abstract
A class of D-π-A compounds that can be used as dyes for applications in polymer solar cells has theoretically been designed and studied, on the basis of the dyes recently shown by experiment to have the highest power conversion efficiency (PCE), namely the [...] Read more.
A class of D-π-A compounds that can be used as dyes for applications in polymer solar cells has theoretically been designed and studied, on the basis of the dyes recently shown by experiment to have the highest power conversion efficiency (PCE), namely the poly[4,8-bis(5-(2-butylhexylthio)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl-alt-TZNT] (PBDTS-TZNT) and poly[4,8-bis(4-fluoro-5-(2-butylhexylthio)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl-alt-TZNT] (PBDTSF-TZNT) substances. Electronic structure theory computations were carried out with density functional theory and time-dependent density functional theory methods in conjunction with the 6−311G (d, p) basis set. The PBDTS donor and the TZNT (naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole)) acceptor components were established from the original substances upon replacement of long alkyl groups within the thiophene and azole rings with methyl groups. In particular, the effects of several π-spacers were investigated. The calculated results confirmed that dithieno[3,2-b:2′,3′-d] silole (DTS) acts as an excellent π-linker, even better than the thiophene bridge in the original substances in terms of well-known criteria. Indeed, a PBDTS-DTS-TZNT combination forms a D-π-A substance that has a flatter structure, more rigidity in going from the neutral to the cationic form, and a better conjugation than the original compounds. The highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gap of such a D-π-A substance becomes smaller and its absorption spectrum is more intense and red-shifted, which enhances the intramolecular charge transfer and makes it a promising candidate to attain higher PCEs. Full article
(This article belongs to the Special Issue Organic Photovoltaic)
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