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Issue 19, 2017
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Efficiency improvement of dye-sensitized solar cells by in situ fluorescence resonance energy transfer

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Abstract

A 1,8-naphthalimide derivative (H-NIM) containing an alkyl carboxylic chain has been rationally designed and synthesized for efficient utilization of fluorescence resonance energy transfer (FRET) in dye-sensitized solar cells (DSSCs). The H-NIM fluorophore, which can absorb ultraviolet light and emit green light under illumination, is doped into a TiO2 mesoporous film with N719 molecules by a co-adsorption method. The H-NIM fluorophore adsorbs on the TiO2 by the same method as N719, via its carboxylic groups, ensuring more efficient energy transfer from H-NIM (FRET donor) to N719 (FRET acceptor) via in situ FRET and thereby promoting light harvesting of N719 molecules in the spectral range of ultraviolet light. The co-adsorption of H-NIM and N719 also reduces charge recombination by shielding the contact area between TiO2 and the electrolyte. Our results show that the optimal doping ratio of the H-NIM fluorophore is 17%, at which the power conversion efficiency (PCE) of the DSSC is improved by 10.8% and 21% under one sun (AM1.5G) and 600 lux illumination by T5 fluorescent lamps, respectively, compared with a DSSC in which only N719 molecules were adsorbed.

Graphical abstract: Efficiency improvement of dye-sensitized solar cells by in situ fluorescence resonance energy transfer

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Supplementary files

Article information


Submitted
19 Jan 2017
Accepted
11 Apr 2017
First published
12 Apr 2017

J. Mater. Chem. A, 2017,5, 9081-9089
Article type
Paper

Efficiency improvement of dye-sensitized solar cells by in situ fluorescence resonance energy transfer

Y. Lin, J. Chen, P. Hsiao, Y. Tung, C. Chang and C. Chen, J. Mater. Chem. A, 2017, 5, 9081
DOI: 10.1039/C7TA00638A

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