Open Access Nano Express

Effect of TiO2 nanoparticle-accumulated bilayer photoelectrode and condenser lens-assisted solar concentrator on light harvesting in dye-sensitized solar cells

Kook Joo Moon1, Sun Woo Lee2, Yong Hun Lee2, Ji Hoon Kim3, Ji Young Ahn3, Seung Jun Lee3, Deug Woo Lee23 and Soo Hyung Kim123*

Author Affiliations

1 Department of Samsung Advanced Integrated Circuit Engineering, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, South Korea

2 Department of Nanomechatronics Engineering, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, South Korea

3 Department of Nano Fusion Technology, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, South Korea

For all author emails, please log on.

Nanoscale Research Letters 2013, 8:283  doi:10.1186/1556-276X-8-283

Published: 12 June 2013

Abstract

TiO2 nanoparticles (NPs) with a size of 240 nm (T240), used as a light-scattering layer, were applied on 25-nm-sized TiO2 NPs (T25) that were used as a dye-absorbing layer in the photoelectrodes of dye-sensitized solar cells (DSSCs). In addition, the incident light was concentrated via a condenser lens, and the effect of light concentration on the capacity of the light-scattering layer was systematically investigated. At the optimized focal length of the condenser lens, T25/T240 double layer (DL)-based DSSCs with the photoactive area of 0.36 cm2 were found to have the short circuit current (Isc) of 11.92 mA, the open circuit voltage (Voc) of 0.74 V, and power conversion efficiency (PCE) of approximately 4.11%, which is significantly improved when they were compared to the T25 single layer (SL)-based DSSCs without using a solar concentrator (the corresponding values were the Isc of 2.53 mA, the Voc of 0.69, and the PCE of 3.57%). Thus, the use of the optimized light harvesting structure in the photoelectrodes of DSSCs in conjunction with light concentration was found to significantly enhance the power output of DSSCs.

Keywords:
Dye-sensitized solar cell; Solar concentrator; Plano-convex lens; Focal length; Light-scattering layer