Journal
CHEMSUSCHEM
Volume 7, Issue 8, Pages 2221-2229Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402160
Keywords
energy conversion; ionic liquids; metal-free; sensitizers; solar cells
Funding
- National Taiwan University
- Academia Sinica (AS)
- National Science Council (NSC) Taiwan
- Instrumental Center of Institute of Chemistry (AS)
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Metal-free dyes containing a phenothiazinedioxide entity in the spacer were synthesized. The best conversion efficiency (7.47%) of the dye-sensitized solar cell (DSSC) by using new sensitizers with chenodeoxycholic acid as a co-adsorbent and the I-/I-3(-) electrolyte reached over 90% of that of the standard N719-based cell (8.10 %). A new type of ionic liquid containing the nitroxide radical (N-O-center dot) and iodide was successfully synthesized and applied to the DSSCs. If the I-/I-3(-) electrolyte was replaced with a dual redox electrolyte, that is, a TEMPO (2,2,6,6-tetramethylpiperidin- 1-oxyl) derivative with a dangling imidazolium iodide entity, the cell exhibited a high open-circuit voltage of 0.85 V and a cell efficiency of 8.36 %.
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