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Energies
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High-Efficiency Organic Photovoltaics
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High-Efficiency Organic Photovoltaics

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A2: Solar Energy and Photovoltaic Systems".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 13246

Special Issue Editors

Prof. Dr. Fujun Zhang

E-Mail Website
Guest Editor
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China
Interests: orgnaic photodetectors; organic solar cells
Special Issues, Collections and Topics in MDPI journals
Dr. Xiaoling Ma

E-Mail Website
Guest Editor
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing, China
Interests: organic optoelectronic materials and devices

Special Issue Information

Dear Colleagues,

Organic photovoltaics (OPVs) have attracted extensive attention due to their advantages of low cost, environmental friendliness, flexibility and large-area preparation. Benefiting from materials synthesis and device engineering, great progress has been achieved for single layer bulk heterojunction OPVs with a simple fabrication process. At present, further improving the performance of single layer bulk heterojunction OPVs is still a major goal in this region.

The synthesis of highly efficient organic photovoltaic materials and interfacial layer materials is the cornerstone to improve the performance of OPVs. In recent years, emerging as a new material in the OPVs filed, nonfullerene materials have attracted intense attention due to their excellent optical absorption ability, easily tunable chemical structures and energy levels. From the device engineering side, ternary OPVs, including the blends of two donors/one acceptor or one donor/two acceptors with complementary absorption spectra, constitute an increasingly promising approach.

This Special Issue focuses on the latest advancements realized in the field of OPVs, including fundamental investigations of working mechanism and exciton/charge carrier dynamic process, industrialization-oriented researches, such as semitransparent OPVs, thick-film OPVs and so on.

We invite papers on recent developments of OPVs from materials innovation and device engineering sides, as well as reviews relevant to the future development direction and application prospects of OPVs.

Prof. Dr. Fujun Zhang
Dr. Xiaoling Ma
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. Energies 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 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

  • Organic photovoltaics
  • Ternary strategy
  • Semitransparent OPVs
  • Thick-film OPVs

Published Papers (5 papers)

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Editorial

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3 pages, 181 KiB  
Editorial
Advanced Progress of Organic Photovoltaics
by Xinlei Wu, Yuanpeng Zhang, Kaihang Shi, Xiaoling Ma and Fujun Zhang
Energies 2023, 16(3), 1375; https://0-doi-org.brum.beds.ac.uk/10.3390/en16031375 - 29 Jan 2023
Viewed by 1384
Abstract
Modern civilization and economic development of humankind have been largely based on the exploitation and utilization of fossil energy [...] Full article
(This article belongs to the Special Issue High-Efficiency Organic Photovoltaics)

Research

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13 pages, 2267 KiB  
Article
Double Cathode Modification Improves Charge Transport and Stability of Organic Solar Cells
by Tao Lin and Tingting Dai
Energies 2022, 15(20), 7643; https://0-doi-org.brum.beds.ac.uk/10.3390/en15207643 - 16 Oct 2022
Cited by 2 | Viewed by 1459
Abstract
Introducing a cathode modification layer is an effective method to obtaining highly efficient organic solar cells (OSCs) and improving their stability. Herein, we innovatively introduced a double cathode modification layer (SnO2/ZnO) into a non-fullerene OSCs based on PM7:IT-4F and explored the [...] Read more.
Introducing a cathode modification layer is an effective method to obtaining highly efficient organic solar cells (OSCs) and improving their stability. Herein, we innovatively introduced a double cathode modification layer (SnO2/ZnO) into a non-fullerene OSCs based on PM7:IT-4F and explored the mechanisms. The effects of SnO2/ZnO film on charge carriers transfer in OSCs are studied via a variety of electrical testing methods including Photo-CELIV measurements. As a result, a cathode buffer layer with low recombination rate and high carrier mobility could be introduced, which is beneficial to electron transport and collection. The champion device based on the double cathode modification layer acquires an efficiency of 12.91%, obviously higher than that of the single cathode modification layer (SnO2 or ZnO) device. Moreover, The SnO2/ZnO double layer is demonstrated to be of great help in the improvement of device stability, and our work could provide a new inspiration for the preparation of OSCs cathode modification layer. Full article
(This article belongs to the Special Issue High-Efficiency Organic Photovoltaics)
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10 pages, 2044 KiB  
Article
Formation of a Fast Charge Transfer Channel in Quasi-2D Perovskite Solar Cells through External Electric Field Modulation
by Xixiang Zhu, Liping Peng, Jinpeng Li, Haomiao Yu and Yulin Xie
Energies 2021, 14(21), 7402; https://0-doi-org.brum.beds.ac.uk/10.3390/en14217402 - 05 Nov 2021
Cited by 1 | Viewed by 1672
Abstract
Quasi-2D perovskites solar cells exhibit excellent environmental stability, but relatively low photovoltaic properties, compared with 3D perovskites solar cells. However, charge transport and extraction in quasi-2D perovskite solar cells are still limited by the inevitable quantum well effect, resulting in low power conversion [...] Read more.
Quasi-2D perovskites solar cells exhibit excellent environmental stability, but relatively low photovoltaic properties, compared with 3D perovskites solar cells. However, charge transport and extraction in quasi-2D perovskite solar cells are still limited by the inevitable quantum well effect, resulting in low power conversion efficiency (PCE). To date, most efforts concentrate on crystal orientation and favorable alignment during materials and films processing. In this paper, we demonstrated that the quasi-2D perovskite [(BA)2(MA)3Pb4I13 (n = 4)] solar cells show an optimized device performance through forming a fast charge transfer channel among 2D quantum wells through external electric field modulation, with appropriate modulation bias and time after the device has been fabricated. Essentially, ions will move directionally due to local polarization in quasi-2D perovskite solar cells under the action of electric field modulation. More importantly, the mobile ions function as a dopant to de-passivate the defects when releasing at grain boundaries, while decreasing built-in potential by applying forward modulation bias with proper modulation time. The capacitance-voltage characteristics indicate that electric field modulation can decrease the charge accumulation and improve the charge collection in quasi-2D perovskite solar cells. Photoluminescence (PL) studies confirm that the non-radiative recombination is reduced by electric field modulation, leading to enhanced charge transfer. Our work indicates that external electric field modulation is an effective method to form a fast charge transfer channel among 2D quantum wells, leading to enhanced charge transfer and charge collection through local polarization toward developing high–performance quasi-2D perovskite devices. Full article
(This article belongs to the Special Issue High-Efficiency Organic Photovoltaics)
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10 pages, 1524 KiB  
Article
Easily Prepared Transparent Electrodes for Low-Cost Semitransparent Inverted Polymer Solar Cells
by Jiaxin Guo, Ziming Bu, Shuo Han, Yanyu Deng, Chunyu Liu and Wenbin Guo
Energies 2021, 14(18), 5837; https://0-doi-org.brum.beds.ac.uk/10.3390/en14185837 - 15 Sep 2021
Viewed by 1574
Abstract
The continuous thin film of silver (Ag) film is important for semitransparent electrodes in polymer solar cells, while the Ag atoms form as non-continuous below a critical thickness. Here, semitransparent inverted polymer solar cells were fabricated using thermally evaporated Ag/germanium (Ge)/Ag as highly [...] Read more.
The continuous thin film of silver (Ag) film is important for semitransparent electrodes in polymer solar cells, while the Ag atoms form as non-continuous below a critical thickness. Here, semitransparent inverted polymer solar cells were fabricated using thermally evaporated Ag/germanium (Ge)/Ag as highly transparent electrodes. An ultra-thin Ge film was introduced to modify the growth mode of Ag. The dependence of the device performance and the thickness of the outer Ag film was investigated. Ag/Ge/Ag electrodes exhibited excellent optical and electrical properties, which were proved by the transmittance and reflectance spectra. A champion efficiency of 5.1% was achieved with an open-circuit voltage level of 0.703 V, a short current density of 11.63 mA/cm2, and a fill factor of 63%. The average visible transmittance (300–800 nm) of devices with Ag/Ge/Ag was calculated as 25%. Full article
(This article belongs to the Special Issue High-Efficiency Organic Photovoltaics)
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Review

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27 pages, 6330 KiB  
Review
Recent Progress of Organic Photovoltaics with Efficiency over 17%
by Xuelin Wang, Qianqian Sun, Jinhua Gao, Jian Wang, Chunyu Xu, Xiaoling Ma and Fujun Zhang
Energies 2021, 14(14), 4200; https://0-doi-org.brum.beds.ac.uk/10.3390/en14144200 - 12 Jul 2021
Cited by 76 | Viewed by 5589
Abstract
The power conversion efficiency (PCE) of organic photovoltaics (OPVs) has exceeded 18% with narrow bandgap, non-fullerene materials Y6 or its derivatives when used as an electron acceptor. The PCE improvement of OPVs is due to strong photon harvesting in near-infrared light range and [...] Read more.
The power conversion efficiency (PCE) of organic photovoltaics (OPVs) has exceeded 18% with narrow bandgap, non-fullerene materials Y6 or its derivatives when used as an electron acceptor. The PCE improvement of OPVs is due to strong photon harvesting in near-infrared light range and low energy loss. Meanwhile, ternary strategy is commonly recognized as a convenient and efficient means to improve the PCE of OPVs. In this review article, typical donor and acceptor materials in prepared efficient OPVs are summarized. From the device engineering perspective, the typical research work on ternary strategy and tandem structure is introduced for understanding the device design and materials selection for preparing efficient OPVs. Full article
(This article belongs to the Special Issue High-Efficiency Organic Photovoltaics)
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