TiO2 nanocrystals – MEH-PPV composite thin films as photoactive material

Petrella, Andrea; Tamborra, M.; Cozzoli, P. Davide; Curri, M. Lucia; Striccoli, Marinella; Cosma, Pinalysa; Farinola, Gianluca M.; Babudri, Francesco; Naso, Francesco; Agostiano, Angela

doi:10.1016/j.tsf.2003.10.106

Cited by 70 publications

(62 citation statements)

References 18 publications

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“…[16,17] Photoluminescence quenching and photoelectrochemical activity have been observed in blends of nc-TiO 2 rods and particles capped with oleic acid as surfactant in poly((2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV), but photovoltaic devices were not reported. [18] Following these attempts, and by using a higher hole mobility polymer such as poly(3-hexylthiophene) (P3HT), efficient hybrid blend devices based on isotropic, commercial nc-TiO 2 have been reported with external quantum efficiencies up to 15%, resulting in an overall AM1.5 solar power conversion efficiency h of 0.42%. [19] More recently, efficient photovoltaic devices based on nc-TiO 2 nanorod/MEH-PPV blends have been reported with comparable performances (h ¼ 0.49%) by using additional hole-blocking layers processed from a pure nc-TiO 2 nanorod colloid.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods

Bouclé

Chyla

Shaffer

et al. 2008

Adv Funct Materials

149

133

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Hybrid bulk heterojunction solar cells based on nanocrystalline TiO2 (nc‐TiO2) nanorods capped with trioctylphosphine oxide (TOPO) and regioregular poly(3‐hexylthiophene) (P3HT) are processed from solution and characterized in order to relate the device function (optical absorption, charge separation, and transport and photovoltaic properties) to active‐layer properties and device parameters. Annealing the blend films is found to greatly improve the polymer–metal oxide interaction at the nc‐TiO2/P3HT interface, resulting in a six‐fold increase of the charge separation yield and improved photovoltaic device performance under simulated solar illumination. In addition, the influence of the organic ligand at the nc‐TiO2 particle surface is found to be crucial for charge separation. Ligand‐exchange procedures applied on the TOPO‐capped nc‐TiO2 nanorods with an amphiphilic ruthenium‐based dye are found to further improve the charge‐separation yield at the polymer–nanocrystal interface. However, the poor photocurrents generated in the hybrid blend devices, before and after ligand exchange, suggest that transport within or between nanoparticles limits performance. By comparison with other donor–acceptor bulk heterojunction systems, we conclude that charge transport in the nc‐TiO2:P3HT blend films is limited by the presence of an intrinsic trap distribution mainly associated with the nc‐TiO2 particles.

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Section: Introductionmentioning

confidence: 99%

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods

Bouclé

Chyla

Shaffer

et al. 2008

Adv Funct Materials

149

133

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“…3 The shape of TiO 2 nanocrystals was also shown to affect the charge transfer between poly ͑2-methoxy-5-͑ 2Ј-ethyl-hexyloxy͒-p-phenylene vinylene͒ ͑MEH-PPV͒ and TiO 2 by affecting the number of available percolation paths. 21 Consequently, it is expected that improved photovoltaic performance can be obtained for TiO 2 layer morphology resulting in easy polymer infiltration and a large number of percolation pathways.…”

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confidence: 99%

Titania bicontinuous network structures for solar cell applications

Wang

Oey

Djurišić

et al. 2005

Applied Physics Letters

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“…The absorption spectrum of the pristine polymer MEH-PPV shows a peak at 490 nm. The broad band peaked at 490 nm is ascribed to the π-π* transitions of the conjugated polymer as reported in [3]. Figure 2a reveals that with addition of TiO 2 nanocrystals the absorption peak of MEH-PPV shifts to shorter wavelengths and the optical density of the absorption spectra in the hybrid films increase with respect to the pristine polymer.…”

Section: Morphology Of the Hybrid Tio 2 Nanocrystals -Meh-ppv Thin Filmmentioning

confidence: 51%

Study on Electrical and Optical Properties of the Hybrid Nanocrystalline TiO2 and Conjugated Polymer Thin Films

Hà

Định

Long³

et al. 2009

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Abstract.Recently, the conjugated polymer -inorganic nanocomposites have been increasingly studied due to the potential applications of these advanced materials in developing optoelectronic devices. In this work nanocomposite materials thin films based on poly [2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) and nanocrystalline TiO 2 (nc-TiO 2 ) have been fabricated. The photoluminescence (PL) spectra of pure MEH-PPV and nanohybrid films have shown that the excitation at a 470 nm wavelength leads to the strong quenching in photoluminescent intensity due to the compositions of TiO 2 component. Current-voltage (I-V) characteristics of multi-layer device with structure of Al//MEH-PPV:nc-TiO 2 //PEDOT:PSS//ITO//glass were investigated. The obtained results suggest the application of the hybrid MEH-PPV:nc-TiO 2 materials in polymeric solar cells.

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TiO2 nanocrystals – MEH-PPV composite thin films as photoactive material

Cited by 70 publications

References 18 publications

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods

Titania bicontinuous network structures for solar cell applications

Study on Electrical and Optical Properties of the Hybrid Nanocrystalline TiO2 and Conjugated Polymer Thin Films

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TiO2 nanocrystals – MEH-PPV composite thin films as photoactive material

Cited by 70 publications

References 18 publications

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO2 Nanorods

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO2 Nanorods

Titania bicontinuous network structures for solar cell applications

Study on Electrical and Optical Properties of the Hybrid Nanocrystalline TiO2 and Conjugated Polymer Thin Films

Contact Info

Product

Resources

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Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods

Hybrid Solar Cells from a Blend of Poly(3‐hexylthiophene) and Ligand‐Capped TiO₂ Nanorods