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Issue 13, 2016
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Phenothiazine-based dyes for efficient dye-sensitized solar cells

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Abstract

As an emerging photovoltaic technology, dye-sensitized solar cells (DSSCs) have attracted a great deal of academic and industrial interest due to their reasonably high power conversion efficiency, low material cost and facile fabrication process. Metal-free organic dyes, as one of the key components of DSSCs, play a pivotal role in light harvesting and electron injection. Among the various species of organic dyes, easily tunable 10H-phenothiazine-based dyes hold a large proportion. The electron-rich nitrogen and sulfur atoms render 10H-phenothiazine a stronger donor character than other amines, even better than triphenylamine, tetrahydroquinoline, carbazole and iminodibenzyl. On the other hand, the unique non-planar butterfly conformation of the 10H-phenothiazine ring can sufficiently suppress molecular aggregation and the formation of excimers. The positions N-10, C-3 and C-7 of the 10H-phenothiazine ring system can easily be furnished with electron-donating or electron-withdrawing groups. Thus, the structural features of 10H-phenothiazine-based dyes guarantee the fabrication of efficient DSSCs. Some 10H-phenothiazine-based dyes show high photovoltaic performance, even better than the commercial ruthenium complex (N719). This paper reviews the recent significant scientific progress in 10H-phenothiazine-based DSSCs and focuses especially on the relationship between the molecular structure and the photoelectric conversion properties.

Graphical abstract: Phenothiazine-based dyes for efficient dye-sensitized solar cells

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Publication details

The article was received on 28 Dec 2015, accepted on 29 Feb 2016 and first published on 03 Mar 2016


Article type: Review Article
DOI: 10.1039/C5TC04418A
Citation: J. Mater. Chem. C, 2016,4, 2404-2426
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    Phenothiazine-based dyes for efficient dye-sensitized solar cells

    Z. Huang, H. Meier and D. Cao, J. Mater. Chem. C, 2016, 4, 2404
    DOI: 10.1039/C5TC04418A

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