Journal
JOURNAL OF POWER SOURCES
Volume 247, Issue -, Pages 939-946Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.08.103
Keywords
Long-term; In-situ; PVB; Quasi-solid; UV; ECD
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Leakage of liquid electrolyte and damage to dye-sensitized solar devices due to ultraviolet irradiation typically result in the poor long-term stability of liquid-electrolyte-based dye-sensitized solar cells (DSSCs). In this study, a simple in situ gelation (ISG) process is developed for the quasi-solid-state electrolyte (QSE) in DSSCs using polyvinyl butyral (PVB), a polymer used worldwide in laminated glass. The diffusion coefficients and ionic conductivities of the QSEs are analyzed, and the optimal ionic conductivity is found to be approximately 2.64 x 10(-3) S cm(-1), which is approximately six orders of magnitude higher than that of the original PVB thin film. The ISG-QSE devices exhibit a high conversion efficiency of 4.86% at 100 mW cm(-2): this is approximately 98% of the efficiency of corresponding liquid electrolyte (LSE) cells. Moreover, the devices can maintain a remarkable 98% of their original efficiency after 2100 working hours owing to the addition of 5% UV absorber to the ISG electrolyte. In addition, the ISG-electrolyte-based DSSCs can drive a 5 x 5 cm(2) electrochromic (EC) device, demonstrating the potential for the application of this combination in smart windows in the future. (C) 2013 Elsevier B.V. All rights reserved.
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