NDLI: Improvement of photovoltaic performance of DSSCs by modifying panchromatic zinc porphyrin dyes with heterocyclic units

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhou, Xing-Fu Ju, Xue-Hai Ju, Ze-Min Jia, Hai-Lang Zhang, Ming-Dao Zheng, He-Gen Sun, Hong-Xia
Copyright Year	2014
Abstract	A series of novel panchromatic D–D–π–A porphyrin dyes have been synthesized and applied to dye-sensitized solar cells. Three porphyrin dyes named JP1, JP2 and JP3, and their photophysical and electrochemical properties and photovoltaic performance were investigated and compared with reference dye YD2-O-C8. 2-Hexylthiophene chromophores were introduced to the donor groups, which extended the π-conjugation system effectively, then broadened the range of spectral response and improved the charge separation between the donor and acceptor moieties in the excited state. Moreover, this paper used thiophene-2-carboxylic acid instead of the traditional benzoic acid as an anchor group, which can make the molecules arrange to tilted orientation when adsorbed on the TiO2 surface, and this may effectively suppress the dye aggregation and prevent charge recombination. These dyes were clearly red-shifted when compared with dye YD2-O-C8. Especially for dye JP3, its maximum absorption peak was red shifted 20 nm with respect to dye YD2-O-C8 from 645 to 665 nm, and the molar extinction coefficient (6.2 × 104 M−1 cm−1) of JP3 is double that of YD2-O-C8 (3.1 × 104 M−1 cm−1) at the Q band. Dye JP3 extended the spectral response to 750 nm. The density functional theory (DFT) calculations indicated that the electronic density of the HOMO was increased by the additional thiophene units in these dyes when compared with YD2-O-C8, and this will improve the conjugation and electron donating ability. The power conversion efficiencies of JP1, JP2 and JP3 are 5.09%, 5.62% and 6.40% respectively under AM 1.5G irradiation, which are 74.5%, 82.3% and 93.7% of the YD2-O-C8 based-device (6.83%) under the same conditions.
Starting Page	20841
Ending Page	20848
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	2
Issue Number	48
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta04704d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	HOMO Panchromatic film Porphyrin Dye-sensitized solar cell Electrochemistry Solar cell Dye Thiophene Carboxylic acid Carrier generation and recombination Molar attenuation coefficient Q band Density functional theory Electronic density Amplitude modulation
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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