Efficient Sensitization of Nanocrystalline TiO2 Films by a Near-IR-Absorbing Unsymmetrical Zinc Phthalocyanine

Authors

  • Paidi Yella Reddy Dr.,

    1. Aisin Cosmos R&D Co., Ltd. 50, Hachiken-cho, 5-Chome, Kariya, Aichi 448-8650, Japan
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  • Lingamallu Giribabu Dr.,

    1. Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India
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  • Christopher Lyness,

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • Henry J. Snaith Dr.,

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • Challuri Vijaykumar,

    1. Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India
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  • Malapaka Chandrasekharam Dr.,

    1. Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India
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  • Mannepalli Lakshmikantam Dr.,

    1. Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India
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  • Jun-Ho Yum Dr.,

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • Kuppuswamy Kalyanasundaram Dr.,

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • Michael Grätzel Prof.,

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • Mohammad K. Nazeeruddin Dr.

    1. LPI, Institut des Sciences et Ingénierie Chimiques, Faculté des Sciences de Base, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland, Fax: (+41) 21-693-4111
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  • We acknowledge financial support of this work by the Swiss Federal Office for Energy (OFEN). P.Y.R. and G.L. are thankful to IICT and AISIN COSMOS R&D Co. Ltd. for financial support.

Abstract

original image

Pushing and pulling by three tert-butyl and two carboxylic acid groups, respectively, results in a sensitizer (see picture) that exhibits an incident photon-to-current conversion efficiency of 75 %. A cell sensitized with this compound gives a short-circuit photocurrent density of (6.50±0.20) mA cm−2, an open-circuit voltage of (635±30) mV, and a fill factor of 0.74±0.03, which corresponds to an overall conversion efficiency of 3.05 %.

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