Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells

Erik Gabrielsson; Haining Tian; Susanna K. Eriksson; Jiajia Gao; Hong Chen; Fusheng Li; Johan Oscarsson; Junliang Sun; Håkan Rensmo; Lars Kloo; Anders Hagfeldt; Licheng Sun

doi:10.1039/C4CC06432A

Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells†

Erik Gabrielsson,

^a Haining Tian,*^ab Susanna K. Eriksson,^b Jiajia Gao,^c Hong Chen,^d Fusheng Li,^a Johan Oscarsson,^e Junliang Sun,^d Håkan Rensmo,^e Lars Kloo,^c Anders Hagfeldt^b and Licheng Sun*^af

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* Corresponding authors

^a Department of Chemistry, Organic Chemistry, Center of Molecular Devices, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
E-mail: lichengs@kth.se

^b Department of Chemistry – Ångström Laboratory, Physical Chemistry, Uppsala University, Box 523, 751 20 Uppsala, Sweden
E-mail: haining.tian@kemi.uu.se

^c Department of Chemistry, Applied Physical Chemistry, Center of Molecular Devices, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden

^d Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden

^e Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden

^f State Key Lab of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), 116024 Dalian, China

Abstract

Dipicolinic acid was investigated as a new anchoring group for DSSCs. A pilot dye (PD2) bearing this new anchoring group was found to adsorb significantly stronger to TiO₂ than its cyanoacrylic acid analogue. The electrolyte composition was found to have a strong effect on the photoelectrochemical properties of the adsorbed dye in the device, allowing the dye LUMO energy to be tuned by 0.5 eV. Using a pyridine-free electrolyte, panchromatic absorption of the dye on TiO₂ extending to 900 nm has been achieved. Solar cells using PD2 and a Co(bpy)₃ based electrolyte showed unique stability under simulated sunlight and elevated temperatures.

Chemical Communications

Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells†

Abstract

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Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells

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