scholarly journals Organic Solar Cells: Problems and Perspectives

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
G. Chidichimo ◽  
L. Filippelli
Keyword(s):  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Photovoltaic Cells ◽  
Electric Energy ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Good Efficiency ◽  
Inorganic Semiconductors ◽  
Research Challenge

For photovoltaic cells to convert solar into electric energy is probably the most interesting research challenge nowadays. A good efficiency of these devices has been obtained by using inorganic semiconductor materials. On the other hand, manufacture processes are very expensive in terms of both materials and techniques. For this reason organic-based photovoltaic (OPV) cells are attracting the general attention because of the possible realization of more economical devices. Organic materials are abundant and easily handling. Unfortunately OPV cells efficiency is significantly lower than that of inorganic-based devices, representing a big point of weakness at the present. This is mainly due to the fact that organic semiconductors have a much higher band gap with respect to inorganic semiconductors. In addition, OPV cells are very susceptible to oxygen and water. In this paper we will describe some of the different approaches to the understanding and improving of organic photovoltaic devices.

scholarly journals Free Charge Photogeneration in a Single Component High Photovoltaic Efficiency Organic Semiconductor

2021 ◽  
Author(s):  
Justin Hodgkiss ◽  
Michael Price ◽  
Paul Hume ◽  
Aleksandra Ilina ◽  
Isabella Wagner ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Organic Photovoltaics ◽  
Photovoltaic Cells ◽  
Single Component ◽  
Dielectric Constants ◽  
Organic Photovoltaic ◽  
Free Charge ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Charge Generation

Abstract Organic photovoltaic cells promise cheap, flexible and scalable solar energy. Whereas light directly generates free charges in silicon photovoltaic cells, bound electron and hole pairs known as excitons are understood to be the primary excitations in organic semiconductors due to their low dielectric constants. These excitons must then be split apart at molecular heterojunctions in order to extract current. Recent record efficiency organic photovoltaics utilise the small molecule, Y6, as a key component in the photon-absorbing blend layer. This molecule and its analogues – unlike previous organic semiconductors – have both low band-gaps and high dielectric constants. Here we show that, in a neat film of Y6, these factors lead to intrinsic free charge generation without the need for a molecular heterojunction to split the exciton. We use a suite of intensity-dependent optical spectroscopy measurements to show that a significant (20-90%) fraction of free charges exist in equilibrium with bound states at light intensity equivalent to 1 sun. Rapid bimolecular charge recombination constrains single component Y6 organic photovoltaic devices to low efficiencies, but this recombination is reduced by the introduction of small quantities of donor polymer. Quantum-chemical calculations reveal charge generation pathways through strong coupling between exciton and CT states, and an intermolecular polarisation pattern that drives exciton dissociation. Our results challenge the understanding of how current record efficiency organic photovoltaics operate, and point towards new future possibilities – offering a molecular picture of intrinsic charge generation as a platform to improve charge yields, and renewing the possibility of efficient single-component organic photovoltaic devices.

Photosensitive self-assembling materials as functional dopants for organic photovoltaic cells

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11577-11590 ◽  
Author(s):  
Alexej Bubnov ◽  
Agnieszka Iwan ◽  
Martin Cigl ◽  
Bartosz Boharewicz ◽  
Igor Tazbir ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Liquid Crystalline ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Organic Photovoltaic Cells ◽  
Self Assembling

New photosensitive liquid crystalline compounds with a specific molecular structure have been designed in order to use them as functional dopants for organic photovoltaic devices.

Efficient inverted quasi-bilayer organic solar cells fabricated by using non-halogenated solvent processes

2014 ◽  
Vol 2 (33) ◽  
pp. 13398-13406 ◽  
Author(s):  
Jung-Hao Chang ◽  
Hsiao-Fang Wang ◽  
Wei-Chieh Lin ◽  
Kai-Ming Chiang ◽  
Kuan-Chen Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Halogen Free

Here we demonstrate the fabrication of novel, “quasi-bilayer” inverted organic photovoltaic devices using halogen-free solvents.

Engineering of modular organic photovoltaic devices with dye sensitized architecture

2016 ◽  
Vol 4 (41) ◽  
pp. 16108-16118 ◽  
Author(s):  
Pousali Chal ◽  
Arnab Shit ◽  
Arun K. Nandi
Keyword(s):  
Solar Cells ◽  
Citric Acid ◽  
Organic Solar Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Dye Sensitized

Dye sensitized organic solar cells based on citric acid doped PANI–perylenetetracarboxyldiimide exhibit a moderate efficiency of 4.32%.

scholarly journals Impact of substituents on the performance of small-molecule semiconductors in organic photovoltaic devices via regulating morphology

2022 ◽  
Author(s):  
Mitsuharu Suzuki ◽  
Kanta Suzuki ◽  
Taehyun Won ◽  
Hiroko Yamada
Keyword(s):  
Organic Semiconductors ◽  
Active Layer ◽  
Small Molecule ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Photovoltaic Applications

This review summarizes recent prominent examples of substituent engineering on small-molecule organic semiconductors for photovoltaic applications, focusing on flexible substituents that regulate the active-layer morphology.

scholarly journals Synthetically Facile Organic Solar Cells with > 4% Efficiency using P3HT and a Silicon Phthalocyanine Non-Fullerene Acceptor

2021 ◽  
Author(s):  
Trevor M. Grant ◽  
Chloé Dindault ◽  
Nicole Rice ◽  
Sufal Swaraj ◽  
Benoit Hugo Lessard
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Silicon Phthalocyanine

We demonstrate organic photovoltaic devices with extremely low synthetic complexity by paring poly(3-hexithiophene) (P3HT) with a novel non-fullerene acceptor (NFA) bis(tri-n-propylsilyl oxide) silicon phthalocyanine ((3PS)2-SiPc). (3PS)2-SiPc possesses a relatively unique...

scholarly journals Increased thermal stabilization of polymer photovoltaic cells with oligomeric PCBM

2016 ◽  
Vol 4 (34) ◽  
pp. 8121-8129 ◽  
Author(s):  
Hasina H. Ramanitra ◽  
Simon A. Dowland ◽  
Bruna A. Bregadiolli ◽  
Michael Salvador ◽  
Hugo Santos Silva ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Amorphous Polymer ◽  
Photovoltaic Cells ◽  
Thermal Stabilization ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

Both crystalline and amorphous polymer-based organic photovoltaic devices are stabilized against thermal degradation by an ATRAP prepared PCBM oligomer.

Structure and crystallinity of water dispersible photoactive nanoparticles for organic solar cells

2015 ◽  
Vol 3 (33) ◽  
pp. 17022-17031 ◽  
Author(s):  
E. B. L. Pedersen ◽  
M. C. Pedersen ◽  
S. B. Simonsen ◽  
R. G. Brandt ◽  
A. P. L. Böttiger ◽  
...  
Keyword(s):  
Solar Cells ◽  
Internal Structure ◽  
Organic Solar Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Water Dispersible

By studying water dispersible photoactive nanoparticles used for organic photovoltaic devices, we provide new insights into the internal structure, crystallinity and the previously unreported drastic changes that occur when the particles are cast into a film.

scholarly journals Direct observation of trap-assisted recombination in organic photovoltaic devices

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Stefan Zeiske ◽  
Oskar J. Sandberg ◽  
Nasim Zarrabi ◽  
Wei Li ◽  
Paul Meredith ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Deep Trap ◽  
Organic Photovoltaic ◽  
Trap States ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Loss Mechanism ◽  
Operational Conditions ◽  
Gap States

AbstractTrap-assisted recombination caused by localised sub-gap states is one of the most important first-order loss mechanism limiting the power-conversion efficiency of all solar cells. The presence and relevance of trap-assisted recombination in organic photovoltaic devices is still a matter of some considerable ambiguity and debate, hindering the field as it seeks to deliver ever higher efficiencies and ultimately a viable new solar photovoltaic technology. In this work, we show that trap-assisted recombination loss of photocurrent is universally present under operational conditions in a wide variety of organic solar cell materials including the new non-fullerene electron acceptor systems currently breaking all efficiency records. The trap-assisted recombination is found to be induced by states lying 0.35-0.6 eV below the transport edge, acting as deep trap states at light intensities equivalent to 1 sun. Apart from limiting the photocurrent, we show that the associated trap-assisted recombination via these comparatively deep traps is also responsible for ideality factors between 1 and 2, shedding further light on another open and important question as to the fundamental working principles of organic solar cells. Our results also provide insights for avoiding trap-induced losses in related indoor photovoltaic and photodetector applications.

scholarly journals Optimized Stoichiometry for CuCrO2 Thin Films as Hole Transparent Layer in PBDD4T-2F:PC70BM Organic Solar Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2109
Author(s):  
Lorenzo Bottiglieri ◽  
Ali Nourdine ◽  
Joao Resende ◽  
Jean-Luc Deschanvres ◽  
Carmen Jiménez
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Organic Photovoltaic ◽  
Atmospheric Conditions ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Solution Composition

The performance and stability in atmospheric conditions of organic photovoltaic devices can be improved by the integration of stable and efficient photoactive materials as substituent of the chemically unstable poly (3,4-ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS), generally used as organic hole transport layer. Promising candidates are p-type transparent conductive oxides, which combine good optoelectronic and a higher mechanical and chemical stability than the organic counterpart. In this work, we synthesize Cu-rich CuCrO2 thin films by aerosol-assisted chemical vapour deposition as an efficient alternative to PEDOT:PSS. The effect of stoichiometry on the structural, electrical, and optical properties was analysed to find a good compromise between transparency, resistivity, and energy bands alignment, to maximize the photovoltaic performances., Average transmittance and bandgap are reduced when increasing the Cu content in these out of stoichiometry CuCrO2 films. The lowest electrical resistivity is found for samples synthesized from a solution composition in the 60–70% range. The optimal starting solution composition was found at 65% of Cu cationic ratio corresponding to a singular point in Hackee’s figure of merit of 1 × 10−7 Ω−1. PBDD4T-2F:PC70BM organic solar cells were fabricated by integrating CuCrO2 films grown from a solution composition ranging between 40% to 100% of Cu as hole transport layers. The solar cells integrating a film grown with a Cu solution composition of 65% achieved a power conversion efficiency as high as 3.1%, representing the best trade-off of the optoelectronic properties among the studied candidates. Additionally, despite the efficiencies achieved from CuCrO2-based organic solar cells are still inferior to the PEDOT:PSS counterpart, we demonstrated a significant enhancement of the lifetime in atmospheric conditions of optimal oxides-based organic photovoltaic devices.

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