Journal
DYES AND PIGMENTS
Volume 99, Issue 1, Pages 74-81Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2013.04.023
Keywords
Dye-sensitized solar cell; Non-planar; Sensitizer; Triphenylamine; Recombination; Open-circuit voltage
Funding
- National Natural Science Foundation of China [21272079, 20873183, 21072064]
- Natural Science Foundation of Guangdong Province, China [10351064101000000, S2012010010634]
- Guangzhou Science and Technology Project, China [2012J4100003]
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Three novel sensitizers with dendritic triphenylamine moieties were synthesized and used for dye-sensitized solar cells (DSSCs). Their absorption spectra, electrochemical and photovoltaic properties were extensively investigated. All three DSSCs exhibit high open-circuit voltage over 0.8 V. The photovoltaic results indicate that the dendritic triphenylamine units improve the open-circuit voltage, which is attributed to the retardation of charge recombination, demonstrating that non-planar and larger molecules exert better blocking function. Under standard global AM 1.5 solar conditions, the best performance of the DSSCs exhibits a short-circuit current density of 10.35 mA cm(-2), an open-circuit voltage of 0.836 V and a fill factor of 0.68, corresponding to an overall conversion efficiency of 5.87%. (C) 2013 Elsevier Ltd. All rights reserved.
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