Dye-sensitized solar cells (DSSCs) were fabricated using Ti 02 nanotube arrays (NTAs) as the photoanodes, which were adhered onto transparent conducting glass substrates by a carbon nanotube (CNT)-Ti02 composite paste. The effect of the CNT contents on the DSSC performance was investigated by adjusting the ratios of CNTs to TiO2 in the paste. It was found that DSSC efficiencies firstly increased and then decreased with increasing the CNT contents. The optimized DSSC efficiency of 6.77% was achieved at a suitable CNT concentration (0.1 wt%), which was due to a balance of the electron transport and light harvesting. 2014 Elsevier B.V. All rights reserved.