Browsing by Author "Jhang, Jia-Cih"

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Improvement of the efficiency of dye-sensitized solar cells with fluorinated carbon-based liquid crystal dopant
(2017-08-01)
You, Chang-Feng
;
Cheng, Cheng-En
;
Lei, Bi-Cheng
;
Jhang, Jia-Cih
;
Yu, Fang-Cheng
The long-term stability of dye-sensitized solar cells (DSSCs) can be improved using a liquid crystal (LC) dopant. However, the high viscosity of the LC dopant reduces the power conversion efficiency (PCE) of these cells. In this study, low-viscosity LC is doped into the DSSCs. The results indicate that the polar fluoro groups of the LCs effectively interact with the cyano groups of the organic solvent in the liquid electrolyte, enhancing the long-term stability of the DSSCs. The viscosity of the LC dopant is a key factor that affects the light-to-electrical energy conversion efficiency of the LC-doped DSSCs. The short-current density and related PCE of the DSSCs is not reduced because of the low viscosity of the doped fluorinated carbon-based LCs. (C) 2017The Physical Society of the Republic of China(Taiwan). Published by ElsevierB.V. All rights reserved.
Liquid crystal-doped liquid electrolytes for dye-sensitized solar cell applications
(2016-04-01)
Huang, Chi-Yen
;
You, Chang-Feng
;
Cheng, Cheng-En
;
Lei, Bi-Cheng
;
Jhang, Jia-Cih
We investigate the effects of liquid crystals (LCs) on the power conversion efficiency of dye-sensitized solar cells (DSSCs). The photovoltaic and electrochemical impedance spectra indicate that minute amounts of LC dopant decrease the short-current density of DSSCs because the doped LCs reduce the electrochemical reaction rate between DSSC counter electrode and electrolyte. The doped LCs delay the degradation rates of DSSCs because of the interaction between cyano groups of the doped LCs and organic solvent in the liquid electrolyte. Owing to the molecular interaction, the doped LCs increase the viscosity and stability, thereby inhibiting the evaporation rate of the liquid electrolyte. (C) 2016 Optical Society of America