Origin of Nonlinear Device Performance with Illuminated Sun Intensity in Mesoscopic Sb<sub>2</sub>S<sub>3</sub>-sensitized Photoelectrochemical Solar Cells using Cobalt Electrolyte

Im, Sang-Hyuk; Lee, Yong-Hui; Kim, Hi-Jung; Lim, Choong-Sun; Kang, Yong-Ku; Seok, Sang-Il

doi:2011.2.3.174

J. Electrochem. Sci. Technol > Volume 2(3); 2011 > Article

Article

Journal of Electrochemical Science and Technology 2011;2(3):174-179.
DOI: https://doi.org/10.5229/JECST.2011.2.3.174

Origin of Nonlinear Device Performance with Illuminated Sun Intensity in Mesoscopic Sb₂S₃-sensitized Photoelectrochemical Solar Cells using Cobalt Electrolyte

Sang-Hyuk Im, Yong-Hui Lee, Hi-Jung Kim, Choong-Sun Lim, Yong-Ku Kang, Sang-Il Seok

KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology;

Abstract

The mesoscopic $Sb_2S_3$-sensitized photoelectrochemical solar cells using cobalt redox electrolyte exhibit nonlinear behavior of power conversion efficiency with illuminated sun intensity. From the measurement of bulk diffusion and electrochemical impedance spectroscopy studies, we suggest that the nonlinearity of device performance with illuminated sun intensity is attributed not to the slow bulk diffusion problem of cobalt electrolyte but to the limited mass transport in narrowed pore volume in mesoscopic $TiO_2$ electrode.

Key Words: $Sb_2S_3$, Photoelectrochemical solar cell, $TiO_2$, Cobalt electrolyte