New organic discotic materials for photovoltaic conversion

Oukachmih, Mimoun; Destruel, P.; Séguy, Isabelle; Ablart, G.; Jolinat, Pascale; Archambeau, S.; Mabiala, M.; Fouet, S.; Böck, Harald

doi:10.1016/j.solmat.2004.05.012

Cited by 61 publications

(38 citation statements)

References 19 publications

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“…[25] Co-deposition of hexabenzocoronenes and a perylenediimide acceptor from solutions leads to vertically segregated films of acceptor and donor. When incorporated into diodes structures, these films lead to solar cells with a maximum external quantum efficiency of 34 % at 490 nm.…”

Section: From 1d To 2d P-conjugated Systemsmentioning

confidence: 99%

“…[42][43][44][45][46][49][50][51] Shirota and co-workers have reported star-shaped molecules consisting of a TPA core substituted by three conjugated chains containing phenyl, thienyl, and selenophenyl groups (17)(18)(19)(20). [43] Hole drift mobilities on the order of 1 × 10 Cremer and Bäuerle have described a series of star-shaped donor-acceptor systems consisting in head-to-tail coupled nTs containing two to six thiophene units and terminal perylene imide units (25) attached onto a central TPA core. A bulk heterojunction fabricated from a 1:4 w/w mixture of 25 (n = 2) and PCBM gave a V oc of 0.60 V, a J sc of 1.4 mA cm -2 , and a fill factor of 0.29 resulting in a power conversion efficiency of 0.25 % under white light illumination at 100 mW cm -2 .…”

Section: Triphenylamine Based Pseudo-3d Conjugated Systemsmentioning

confidence: 99%

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From One‐ to Three‐Dimensional Organic Semiconductors: In Search of the Organic Silicon?

2007

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Organic semiconductors based on π‐conjugated systems are the focus of considerable interest in the emerging area of soft or flexible photonics and electronics. Whereas in recent years the performances of devices such as organic light‐emitting diodes (OLEDs), organic field‐effect transistors (OFETs), or solar cells have undergone considerable progress, a number of technical and fundamental problems related to the low dimensionality of organic semiconductors based on linear π‐conjugated systems remain unsatisfactorily resolved. This low dimensionality results in an anisotropy of the optical and charge‐transport properties, which in turn implies a control of the material organization/molecular orientation during or after device fabrication. Such a constraint evidently represents a problem when device fabrication by solution‐based processes, such as printing techniques, is envisioned. The aim of this short Review is to illustrate possible alternative strategies based on the development of organic semiconductors with higher dimensionality, capable to exhibit isotropic electronic properties.

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Section: From 1d To 2d P-conjugated Systemsmentioning

confidence: 99%

Section: Triphenylamine Based Pseudo-3d Conjugated Systemsmentioning

confidence: 99%

From One‐ to Three‐Dimensional Organic Semiconductors: In Search of the Organic Silicon?

2007

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“…1,2,3,4,5,6,7,8 These devices require high charge-carrier mobility for operation, and columnar liquid-crystalline materials displaying high charge-carrier mobility along their columnar stacks are particularly attractive for this purpose. 1,9,10,11,12 The transfer efficiency depends on the nature and intensity of the intermolecular interactions that maintain the molecular stacks order over long ranges in the columnar structure.…”

Section: Introductionmentioning

confidence: 99%

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Chico

Domínguez

Donnio

et al. 2016

Crystal Growth & Design

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Stable organometallic complexes [AuX(CN-TriPh)] [X = Cl, C6F5, C6F4O-C10H21, C6F4O-(R)-2-octyl], [(μ-4,4′-C6F4C6F4){Au(CN-TriPh)}2], [CuCl(CN-TriPh)], trans-[PtI2(CN-TriPh)2], and [Ag(CN-TriPh)2]BF4, bearing the previously unreported triphenylene-isocyanide ligand 1-isocyano-2,3,6,7,10,11-hexadodecyloxytriphenylene (CN-TriPh), have been synthesized. The coordination features of the metal ion determine their thermal behavior. The free isocyanide ligand and all of the monomeric gold derivatives display enantiotropic mesomorphic behavior over a wide range of temperature (from 5 to 220 °C), while the copper complex, with the same stoichiometry but not isostructural with the gold complexes, melts directly to an isotropic liquid. The bis-isocyanide platinum and silver complexes also melt directly to an isotropic liquid at low temperatures. In this case, the two trans coordinated isocyanide ligands, connected by a too short linker, cannot become coplanar, which prevents the formation of a mesogenic structure. On the contrary, in the dinuclear gold complex the two isocyanide trans ligands are, due to the long Au–C6F4–C6F4–Au bridge, sufficiently separated to become coplanar, and this complex gives rise to a mesophase. The structures of the mesophases were determined by small-angle X-ray scattering. All materials prepared show a fluorescent emission centered on the triphenylene core.

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“…PV parameters of some best-performing devices are tabulated in Table 3. The first report appeared in 2005 when Oukachmih et al 120 prepared two-layered devices using TP ether 5a (Figure 10) as a hole-transporting material and perylene derivatives 2d, 2f and 2g ( Figure 5) as electron-transporting materials. These devices showed EQE of around 3%.…”

Section: Tp Discotics In Pvsmentioning

confidence: 99%

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Kumar

2016

Polym J

140

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This article presents an overview of the developments in the field of organic photovoltaics (PVs) with liquid crystals (LCs). A brief introduction to the PV and LC fields is given first, followed by application of various LCs in organic PVs. Details of LCs used in bilayer solar cells, bulk heterojunction solar cells and dye-sensitized solar cells have been given. All the liquid crystalline materials used in PVs are structured and the efficiency of solar cells is tabulated. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of self-organizing supramolecular LC PV research is provided. Polymer Journal (2017) 49, 85-111; doi:10.1038/pj.2016.109; published online 9 November 2016 INTRODUCTIONFor the sustainable growth of the global economy, availability of cheap energy is essential. Our energy demand is increasing continuously to improve our lifestyle. At present, fossil energy sources are the primary sources for most of the world's current energy requirements and only a little is provided by hydropower, nuclear energy and biomass. The exponential growth of carbon dioxide level in the atmosphere owing to the burning of fossil fuels is leading to the threat of a universal climate change. Moreover, there will be limited availability of conventional energy sources in the long term. Future energy demand cannot be met with conventional sources of energy. Nuclear energy sources are one of the promising energy sources, but owing to their associated hazardousness and cost effectiveness, these energy sources does not appear to be socially acceptable universally. Moreover, nuclear fuel is also limited to tackle gigantic demand of energy. Despite several efforts, the problem of energy provision around the world remains unsolved, and there is a great need of finding alternative clean energy sources. To solve the energy crisis of the globe, exploitation of solar energy is undoubtedly the best answer. It is the most abundant inexhaustible source of regenerative energy. It is known since the evolution of life on the Earth that Mother Nature generates chemical energy from solar energy via photosynthesis. The supply of energy by Sun on Earth in an hour is more than that we use in a year. Therefore, only a fraction of solar energy is required to overcome our all energy requirements, if it can be converted to electric energy efficiently. The device that is developed to convert solar energy into electrical energy is known as photovoltaic (PV) solar cell.During the past 60 years, PV energy has been used as a promising candidate for energy devices because it is abundant, inexhaustible, cheap, straight to production ability and pollution-free that does not raise the green-house gases. The PV effect involves the generation of a photocurrent and photovoltage on absorption of light photons in a semiconductor. The three-step process, which is an

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New organic discotic materials for photovoltaic conversion

Cited by 61 publications

References 19 publications

From One‐ to Three‐Dimensional Organic Semiconductors: In Search of the Organic Silicon?

From One‐ to Three‐Dimensional Organic Semiconductors: In Search of the Organic Silicon?

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

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