http://dx.doi.org/10.1039/C5TA01665G">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Co-sensitization of 3D bulky phenothiazine-cored photosensitizers with planar squaraine dyes for efficient dye-sensitized solar cells

Language

English

Abstract

© The Royal Society of Chemistry. A series of new phenothiazine-cored 3D bulky organic sensitizers TP1-TP4 have been prepared and employed in dye-sensitized solar cells (DSSCs). The 3D bulky configuration of these molecules can effectively retard the charge recombination at the TiO2/electrolyte interface. Amongst the four dyes, the co-adsorbent-free DSSC based on the dye TP3 exhibited the best conversion efficiency (η) of 8.00%. Subsequently, the photosensitizer TP3 with strong UV-visible absorption and excellent performance in adsorbent-free DSSCs was co-sensitized with a near-infrared (NIR) absorbing squaraine dye YR6 to realize a UV-visible-NIR light-harvesting capability, which can effectively suppress the dye aggregation of YR6 with a planar structure and retard the charge recombination in the as prepared DSSC. Upon optimization, the co-sensitized DSSCs exhibited remarkable overall efficiency enhancements of 33% and 356% as compared with the devices based on TP3 and YR6 alone, respectively, and a high efficiency up to 9.84% was achieved at the TP3/YR6 molar ratio of 25 : 1.

Publication Date

2015

Source Publication Title

Journal of Materials Chemistry A

Volume

3

Issue

26

Start Page

13848

End Page

13855

Publisher

Royal Society of Chemistry

ISSN (print)

20507488

ISSN (electronic)

20507496

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