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Progress in Organic and Hybrid Photovoltaics: Research and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (30 March 2022) | Viewed by 3167

Special Issue Editor


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Guest Editor
Departamento de Física and i3N – Institute of Nanostructures, Nanomodelling and Nanofabrication, Universidade de Aveiro, 3810-193 Aveiro, Portugal
Interests: organic semiconductors; light emitting diodes (OLEDs); photovoltaics (OPVs); field effect transistors (OFETs); chemical/biological sensors for environment and human analytes

Special Issue Information

Dear Colleagues,
 
The search for clean energy sources has been a fundamental key in materials research. Particularly, the photovoltaic (PV) field attracts significant scientific and technological resources towards concepts like low costs, efficiency, lifespan, niche applications as well as suitable and reliable power generation. In the pathway, the known third-generation PVs still being evaluated as an advanced emerging technology. Under focus, organic photovoltaics (OPVs), perovskite solar cells and dye-sensitized solar cells (DSSCs), appears as the most promising for applications. In the last years, due to new materials and fabrication process, these new PVs technologies became more than a simple laboratory curiosity, achieving compatible marks for industrial deployment.
So far, the high versatility of fabrication process, including printing, solution deposition even in large-scale methods, low-cost and simplicity, induces a high technological attractiveness. Additionally, these kind of emerging PVs can be of interest in specific and complementary niche applications.
In the complex photovoltaic process, from the light absorption until charge collection at electrodes, the final figures of merit are strongly dependent on the materials properties, device structure and on the molecular conformation. Each framework, with proper physical models related with the energy stepwise conversion, needs to be fully understand to allow reliable improvements. Factors like absorption coefficients, diffusion lengths, carrier mobilities and interface / phase properties, materials and film formation, modulates all the macroscopic PV behavior and being currently the relevant framework. We expect that may contributes significantly to accelerating the R&D in this area. The progress of such interrelationship roadmap, will determine how fast will be the reality of the awaited outstanding applications.

This Special Issue aims to focus the novel achievements on research and development of organic / hybrid photovoltaics devices, including, but not limited to, the following topics:
• Donor / Acceptor materials and D/A interface optimization;
• Thermal and photo-stability;
• Photovoltaic active layer morphology and molecular ordering;
• Novel third-generation PVs structures;
• Physical and electrical modulation for new devices and materials approach;
• Figures of merit side based on electrical carrier transport and trapping effects;
• Encapsulation technologies;
• Eco-friendly materials and process;
• Materials for non-conventional substrates, towards lightweight, flexible, thin and outstanding technological applications;
• Materials and process for industrialization, scaling-up and recycling of organic / hybrid photovoltaics;
• Pushing strategies for mid-term organic and hybrid photovoltaics.
 
Guest Editor
Prof. Dr. Luiz Fernando Ribeiro Pereira 

Keywords

  • • New donor-acceptor materials
    • Photovoltaics film morphology and molecular ordering
    • Impurities effects in photovoltaic figures of merit
    • Scaling-up of flexible / lightweight panels
    • New D-A layers interfaces improvement
    • Novel materials and electrical carrier modulation
    • Photovoltaic lifetime and stability
    • Niche applications of organic / hybrid photovoltaics
    • Stability / efficiency trade-off 

Published Papers (1 paper)

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Research

23 pages, 3095 KiB  
Article
PffBT4T-2OD Based Solar Cells with Aryl-Substituted N-Methyl-Fulleropyrrolidine Acceptors
by Hugo Gaspar, Flávio Figueira, Karol Strutyński, Manuel Melle-Franco, Dzmitry Ivanou, João P. C. Tomé, Carlos M. Pereira, Luiz Pereira, Adélio Mendes, Júlio C. Viana and Gabriel Bernardo
Materials 2019, 12(24), 4100; https://0-doi-org.brum.beds.ac.uk/10.3390/ma12244100 - 08 Dec 2019
Cited by 2 | Viewed by 2686
Abstract
Novel C60 and C70 N-methyl-fulleropyrrolidine derivatives, containing both electron withdrawing and electron donating substituent groups, were synthesized by the well-known Prato reaction. The corresponding highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels were determined by cyclic voltammetry, [...] Read more.
Novel C60 and C70 N-methyl-fulleropyrrolidine derivatives, containing both electron withdrawing and electron donating substituent groups, were synthesized by the well-known Prato reaction. The corresponding highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels were determined by cyclic voltammetry, from the onset oxidation and reduction potentials, respectively. Some of the novel fullerenes have higher LUMO levels than the standards PC61BM and PC71BM. When tested in PffBT4T-2OD based polymer solar cells, with the standard architecture ITO/PEDOT:PSS/Active-Layer/Ca/Al, these fullerenes do not bring about any efficiency improvements compared to the standard PC71BM system, however they show how the electronic nature of the different substituents strongly affects the efficiency of the corresponding organic photovoltaic (OPV) devices. The functionalization of C70 yields a mixture of regioisomers and density functional theory (DFT) calculations show that these have systematically different electronic properties. This electronic inhomogeneity is likely responsible for the lower performance observed in devices containing C70 derivatives. These results help to understand how new fullerene acceptors can affect the performance of OPV devices. Full article
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