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Photonics
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Photophysical Processes in Non-fullerene Organic Solar Cells
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Photophysical Processes in Non-fullerene Organic Solar Cells

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 July 2024) | Viewed by 2851

Special Issue Editors

Dr. Wei Zhang

E-Mail Website
Guest Editor
School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
Interests: polymer solar cells; nanostructured materials; ultrafast spectroscopy; ultrafast dynamics; carrier recombination
Special Issues, Collections and Topics in MDPI journals
Dr. Rong Hu

E-Mail Website
Co-Guest Editor
Material Science and Engineering / New Materials Research Institute, Chongqing University of Arts and Science, Chongqing 402171, China
Interests: organic photovoltaic devices; spectroelectrochemistry; time-resolved spectrum; interface engineering; solvent processing; device service life

Special Issue Information

Dear Colleagues,

In the past few years, the development of non-fullerene acceptors represented by Y6 has greatly improved the power conversion efficiency of organic solar cells. At present, the power conversion efficiency of organic solar cells exceeds 19%, showing their broad commercial prospect. On the one hand, the improvement in the photoelectric conversion efficiency of non-fullerene solar cells benefits from the good photon absorption characteristics of non-fullerene materials in the near-infrared region; on the other hand, this is attributed to their unique photophysical properties, which differ from those of fullerene solar cells. For example, the exciton diffusion length of the newly emerging Y acceptors can exceed 50 nm, which is much longer than that of traditional acceptors and conducive to exciton dissociation in non-fullerene solar cells. In addition, the low driving force and better device stability in non-fullerene organic solar cells enables non-fullerene solar cells to be exploited for their advantages in practical applications. However, the physical processes underlying these issues need to be further clarified. In this Special Issue, we aim to discuss various topics related to the photophysical mechanism in non-fullerene solar cells, including advances in device physics and photoelectric conversion dynamics.

Both original research articles and reviews are welcome for this Special Issue. We look forward to receiving your contributions.

Dr. Wei Zhang
Dr. Rong Hu
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. Photonics 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 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

  • polymer solar cell
  • organics solar cell
  • charge photogeneration
  • carrier recombination
  • exciton diffusion
  • non-fullerene acceptors
  • all polymer solar cells

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Published Papers (2 papers)

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Research

19 pages, 3849 KiB  
Article
Comparative Study of Quasi-Solid-State Dye-Sensitized Solar Cells Using Z907, N719, Photoactive Phenothiazine Dyes and PVDF-HFP Gel Polymer Electrolytes with Different Molecular Weights
by Rakesh A. Afre, Ka Yeon Ryu, Won Suk Shin and Diego Pugliese
Photonics 2024, 11(8), 760; https://doi.org/10.3390/photonics11080760 - 14 Aug 2024
Viewed by 1139
Abstract
The present study investigates the influence of photosensitizer selection and the polymer electrolyte composition on the performance of quasi-solid-state dye-sensitized solar cells (QsDSSCs). Two benchmark ruthenium dyes, N719 and Z907, alongside a novel photoactive phenothiazine dye were used. Each dye was incorporated into [...] Read more.
The present study investigates the influence of photosensitizer selection and the polymer electrolyte composition on the performance of quasi-solid-state dye-sensitized solar cells (QsDSSCs). Two benchmark ruthenium dyes, N719 and Z907, alongside a novel photoactive phenothiazine dye were used. Each dye was incorporated into a QsDSSC architecture employing poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the gel electrolyte matrix, with varying molecular weights, to investigate their impacts on the overall device performance and long-term stability. Our results demonstrated that the N719 dye exhibited the highest power conversion efficiency (PCE), attributed to its strong absorption in the visible spectrum and efficient electron injection into the TiO2 photoanode. Z907, on the other hand, showed moderate PCE due to its broader absorption profile but slower electron injection kinetics. The phenothiazine dye revealed promising PCE, with tunable absorption properties and efficient charge transfer. Furthermore, the impact of PVDF-HFP polymer gel electrolytes with varying molecular weights on cell stability was explored. The QsDSSC incorporating the PVH80 polymer with the phenothiazine dye exhibited reduced dye desorption, due to the effective dye molecules’ immobilization by the gel matrix, and consequently enhanced long-term stability over 600 h. This comparative study sheds light on the interplay between dye selection, the polymer gel’s properties, and QsDSSCs’ performance. These insights are crucial in designing robust and efficient QsDSSCs for practical applications. Full article
(This article belongs to the Special Issue Photophysical Processes in Non-fullerene Organic Solar Cells)
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12 pages, 3828 KiB  
Article
Effects of Acceptors on the Charge Photogeneration Dynamics of PM6-Based Solar Cells
by Rong Hu, Liping Zhou, Yurong Liu, Zekai Cai, Guanzhao Wen and Wei Zhang
Photonics 2023, 10(9), 989; https://doi.org/10.3390/photonics10090989 - 30 Aug 2023
Viewed by 1213
Abstract
In this work, we investigated the effects of different acceptors (IT−4F and PC71BM) on the charge dynamics in PM6-based solar cells. The correlation between different acceptors and the performance of organic solar cells was studied by atomic force microscope, steady-state absorption [...] Read more.
In this work, we investigated the effects of different acceptors (IT−4F and PC71BM) on the charge dynamics in PM6-based solar cells. The correlation between different acceptors and the performance of organic solar cells was studied by atomic force microscope, steady-state absorption spectrum, transient absorption spectrum, and electrical measurements. Optical absorption exhibited that IT−4F has strong absorption in the near-infrared region for the active layer. Transient absorption measurements showed that different acceptors (IT−4F and PC71BM) had a significant influence on the behaviors of PM6 excitons and charge dynamics. That is, the exciton dissociation rate and delocalized polaron transport in the PM6:IT−4F active layer were significantly faster than that in the PM6:PC71BM active layer. The lifetime of localized polaron in the PM6:PC71BM active layer was longer than that in the PM6:IT−4F active layer. Conversely, the lifetime of delocalized polaron in the PM6:IT−4F active layer was longer than that in the PM6:PC71BM active layer. Electrical measurement analysis indicated that lower bimolecular recombination, higher charge transport, and charge collection ability were shown in the PM6:IT−4F device compared with the PM6:PC71BM device. Therefore, PM6:IT−4F solar cells achieved a higher power conversion efficiency (12.82%) than PM6:PC71BM solar cells (8.78%). Full article
(This article belongs to the Special Issue Photophysical Processes in Non-fullerene Organic Solar Cells)
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