Journal of the American Chemical Society 2004-10-06

High efficiency of dye-sensitized solar cells based on metal-free indoline dyes.

Tamotsu Horiuchi, Hidetoshi Miura, Kouichi Sumioka, Satoshi Uchida

Index: J. Am. Chem. Soc. 126 , 12218, (2004)

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Abstract

We now report metal-free organic dyes having a new type of indoline structure, which exhibits high efficiencies in dye-sensitized solar cells. The solar energy to current conversion efficiencies with the new indoline dye was 6.51%. Under the same conditions, the N3 dye was 7.89% and the N719 dye was 8.26%. The new indoline dye was optimized for the amount of 4-tert-butyl pyridine in the electrolyte and cholic acid as a coadsorbent. Subsequently, the solar energy to current conversion efficiencies reached 8.00%. This value was the highest obtained efficiency for dye-sensitized solar cells based on metal-free organic dyes without an antireflection layer.