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International Journal of Photoenergy
Volume 2014 (2014), Article ID 872617, 7 pages
Research Article

Structure-Property Relationship of New Organic Sensitizers Based on Multicarbazole Derivatives for Dye-Sensitized Solar Cells

Daegu Gyeongbuk Institute of Science and Technology, 50-1 Sang-ri, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea

Received 10 April 2014; Accepted 13 June 2014; Published 30 June 2014

Academic Editor: Ching-Song Jwo

Copyright © 2014 Hyo Jeong Jo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new multicarbazole based organic dye (C2A1, C2S1A1) with a twisted structure was designed and synthesized, and the corresponding dye (C1A1) without the twisted structure was synthesized for comparison. They were successfully applied in dye-sensitized solar cells (DSSCs). The results showed that the nonplanar structure of C2A1 and C2S1A1 can efficiently retard the dye aggregation and charge recombination. The organic dye (C2S1A1) with thiophene units also exhibited a higher molar extinction coefficient and red-shifted absorption, which leads to an improved light harvesting efficiency. The C2S1A1-sensitized solar cell produced a solar-to-electricity conversion efficiency of 5.1%, high open circuit voltage ( ) of 0.69 V, and short-circuit photocurrent density of 10.83 mA cm−2 under AM 1.5 irradiation (100 mW cm−2) conditions.