title: Novel Blue Organic Dye for Dye-Sensitized Solar Cells Achieving High Efficiency in Cobalt-Based Electrolytes and by Co-Sensitization.
abstract: Blue and green dyes as well as NIR-absorbing dyes have attracted great interest because of their excellent ability of absorbing the incident photons in the red and near-infrared range region. A novel blue D-π-A dye (Dyenamo Blue), based on the diketopyrrolopyrrole (DPP)-core, has been designed and synthesized. Assembled with the cobalt bipyridine-based electrolytes, the device with Dyenamo Blue achieved a satisfying efficiency of 7.3% under one sun (AM1.5 G). The co-sensitization strategy was further applied on this blue organic dye together with a red D-π-A dye (D35). The successful co-sensitization outperformed a panchromatic light absorption and improved the photocurrent density; this in addition to the open-circuit potential result in an efficiency of 8.7%. The extended absorption of the sensitization and the slower recombination reaction between the blue dye and TiO2surface inhibited by the additional red sensitizer could be the two main reasons for the higher performance. In conclusion, from the results, the highly efficient cobalt-based DSSCs could be achieved with the co-sensitization between red and blue D-π-A organic dyes with a proper design, which showed us the possibility of applying this strategy for future high-performance solar cells.
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.
authors: Yan
authors: Y
authors: Hao
authors: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.
authors: Yasemin
authors: Y
authors: Saygili
authors: Applied Physical Chemistry, School of Chemical Science and Engineering, Department of Chemistry, KTH Royal Institute of Technology , Teknikringen 30, SE-100 44 Stockholm, Sweden.
authors: Jiayan
authors: J
authors: Cong
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.
authors: Anna
authors: A
authors: Eriksson
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.
authors: Wenxing
authors: W
authors: Yang
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.
authors: Jinbao
authors: J
authors: Zhang
authors: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.
authors: Enrico
authors: E
authors: Polanski
authors: Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.
authors: Kazuteru
authors: K
authors: Nonomura
authors: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.|Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors: Shaik Mohammed
authors: SM
authors: Zakeeruddin
authors: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.
authors: Michael
authors: M
authors: Grätzel
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.|Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland.|Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors: Anders
authors: A
authors: Hagfeldt
authors: Department of Chemistry-Ångström Laboratory, Center of Molecular Devices, Uppsala University , SE-751 20 Uppsala, Sweden.
authors: Gerrit
authors: G
authors: Boschloo
keywords: blue color; co-sensitization; cobalt electrolyte; dye-sensitized solar cells; organic dyes