Chemistry An Asian Journal 2012-02-06

New organic dye based on a 3,6-disubstituted carbazole donor for efficient dye-sensitized solar cells.

Woochul Lee, Nara Cho, Jongchul Kwon, Jaejung Ko, Jong-In Hong

Index: Chem. Asian J. 2nd ed., 7 , 343-350, (2012)

Full Text: HTML

Abstract

We have synthesized and characterized four organic dyes (H1-H4) based on a 3,6-disubstituted carbazole donor as sensitizers in dye-sensitized solar cells. These dyes have high molar extinction coefficients and energy levels suitable for electron transfer from an electrolyte to nanocrystalline TiO(2) particles. Under standard air mass 1.5 global (AM 1.5 G) solar irradiation, a device using dye H4 exhibits a short-circuit current density (J(sc)) of 13.7 mA cm(-2), an open-circuit voltage (V(oc)) of 0.68 V, a fill factor (FF) of 0.70, and a calculated efficiency of 6.52%. This performance is comparable to that of a reference cell based on N719 (7.30%) under the same conditions. After 1000 hours of visible-light soaking at 60 °C, the overall efficiency remained at 95% of the initial value.Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.