Investigations of Porphyrins and Aromatic Tetracarboxylic Acid Diimides for use in Photovoltaics

Güster, Stefan; Siebentritt, Susanne; Elbe, J.; Kreienhoop, Lutz; Tennigkeit, Bernd; Wöhrle, Dieter; Memming, R.; Meißner, D.

doi:10.1080/10587259208047026

Cited by 20 publications

(11 citation statements)

References 8 publications

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“…Although the maximum brightness of complex 129 is only B500 cd m À2 , its doped devices yield peak electroluminescence efficiencies of 20.0 cd A À1 , 14.9 lm W À1 , and 6.6%. (137)(138)(139)(140)(141)(142) for electroluminescence applications. 64 The emissions of these complexes can be precisely tuned from green to yellow by varying the substituents on the N^C^N-coordinating ligand 1,3-di(2-pyridyl)benzene.…”

Section: 222mentioning

confidence: 99%

Recent progress in metal–organic complexes for optoelectronic applications

et al. 2014

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The design and characterization of metal-organic complexes for optoelectronic applications is an active area of research. The metal-organic complex offers unique optical and electronic properties arising from the interplay between the inorganic metal and the organic ligand. The ability to modify chemical structure through control over metal-ligand interaction on a molecular level could directly impact the properties of the complex. When deposited in thin film form, this class of materials enable the fabrication of a wide variety of low-cost electronic and optoelectronic devices. These include light emitting diodes, solar cells, photodetectors, field-effect transistors as well as chemical and biological sensors. Here we present an overview of recent development in metal-organic complexes with controlled molecular structures and tunable properties. Advances in extending the control of molecular structures to solid materials for energy conversion and information technology applications will be highlighted.

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Section: 222mentioning

confidence: 99%

Recent progress in metal–organic complexes for optoelectronic applications

et al. 2014

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“…37,40,41 Attempts to incorporate porphyrins into polymer solar-cell devices have not achieved power conversion efficiencies as high as electrochemical cells. Similar to the early electrochemical devices, solid-state devices consisting of a vacuum-deposited film of porphyrin sandwiched between metal electrodes 29 or twolayer organic p-n junction devices sandwiched between metal electrodes 49 show low efficiencies because of the low exciton diffusion length in the evaporated film. The high efficiencies exhibited by copper phthalocyanine/C 60 p-n junction devices 50 can largely be attributed to the longer exciton diffusion length in phthalocyanine films as compared to porphyrin films, which is reported to be as high as 68 nm.…”

Section: Introductionmentioning

confidence: 98%

Understanding and Improving Solid-State Polymer/C₆₀-Fullerene Bulk-Heterojunction Solar Cells Using Ternary Porphyrin Blends

et al. 2007

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Solid-state heterojunction solar cells formed from binary blends of conjugated polymers and fullerenes provide a promising class of organic devices. We demonstrate that ternary blends incorporating porphyrins can be of similar morphology to the binary mixture and retain full device functionality. They allow, for the first time, the construction of efficient devices containing less than 10% polymer. By analyzing the absorption spectra as a function of concentration, we determine the proportion of light absorbed by each individual component in both binary and ternary mixtures. This analysis reveals that the majority of the light is absorbed by the fullerene in 1:4 polymer/C 60 -fullerene blends, with over 50% of the photocurrent produced under AM 1.5 conditions occurring subsequent to C 60 -fullerene absorption. This result provides for a consistent understanding of the origin of primary charge separation in general polymer/C 60 -fullerene blends, polymer/C 70 -fullerene blends, and polymer-fullerene dyad molecules. Porphyrins are demonstrated to add broad-band character to the device and may be used to tune for particular wavelengths; they also are shown to initiate primary charge separation through electron-transfer to the fullerene. Finally, addition of the porphyrin is shown to increase the internal quantum efficiency following polymer absorption from ca. 60 to 80%.

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“…However, previous studies of heterostructures with amorphous dye films have shown that only molecules in close proximity to the interface contribute to the photocurrent. 15,[30][31][32][33] This implies that excitons are not able to migrate over large distances 14,33 and only those created near the interface between TiO 2 and ZnTCPP dissociate into a conduction-band electron and a hole in the HOMO of ZnTCPP.…”

Section: Introductionmentioning

confidence: 99%

Hole transport in porphyrin thin films

Savenije

Goossens

2001

Phys. Rev. B

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Hole transport in p-type organic semiconductors is a key issue in the development of organic electronic devices. Here the diffusion of holes in porphyrin thin films is investigated. Smooth anatase TiO 2 films are coated with an amorphous thin film of zinc-tetra͑4-carboxyphenyl͒ porphyrin ͑ZnTCPP͒ molecules acting as sensitizer. Optical excitation of the porphyrin stimulates the injection of electrons into the conduction band of TiO 2 . The remaining holes migrate towards the back electrode where they are collected. Current-voltage and capacitance-voltage analysis reveal that the TiO 2 / ZnTCPP system can be regarded as an n-p heterojunction, with a donor density of N D ϭ2.

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Investigations of Porphyrins and Aromatic Tetracarboxylic Acid Diimides for use in Photovoltaics

Cited by 20 publications

References 8 publications

Recent progress in metal–organic complexes for optoelectronic applications

Recent progress in metal–organic complexes for optoelectronic applications

Understanding and Improving Solid-State Polymer/C₆₀-Fullerene Bulk-Heterojunction Solar Cells Using Ternary Porphyrin Blends

Hole transport in porphyrin thin films

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Investigations of Porphyrins and Aromatic Tetracarboxylic Acid Diimides for use in Photovoltaics

Cited by 20 publications

References 8 publications

Recent progress in metal–organic complexes for optoelectronic applications

Recent progress in metal–organic complexes for optoelectronic applications

Understanding and Improving Solid-State Polymer/C60-Fullerene Bulk-Heterojunction Solar Cells Using Ternary Porphyrin Blends

Hole transport in porphyrin thin films

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Product

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Understanding and Improving Solid-State Polymer/C₆₀-Fullerene Bulk-Heterojunction Solar Cells Using Ternary Porphyrin Blends