title: Phenothiazinedioxide-conjugated sensitizers and a dual-TEMPO/iodide redox mediator for dye-sensitized solar cells.
abstract: 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(-) /I3 (-) 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(.) ) and iodide was successfully synthesized and applied to the DSSCs. If the I(-) /I3 (-) 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%.
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei (Taiwan) a.edu.tw; Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan).
authors.forename: Ryan Yeh-Yung
authors.initials: RY
authors.lastname: Lin
authors.forename: Te-Chun
authors.initials: TC
authors.lastname: Chu
authors.forename: Ping-Wei
authors.initials: PW
authors.lastname: Chen
authors.forename: Jen-Shyang
authors.initials: JS
authors.lastname: Ni
authors.forename: Pei-Chieh
authors.initials: PC
authors.lastname: Shih
authors.forename: Yung-Chung
authors.initials: YC
authors.lastname: Chen
authors.forename: Kuo-Chuan
authors.initials: KC
authors.lastname: Ho
authors.forename: Jiann T
authors.initials: JT
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry*; D011211:Electric Power Supplies; D004563:Electrochemistry; D007454:Iodides / Q000737:chemistry*; D055620:Optical Phenomena; D010084:Oxidation-Reduction; D010640:Phenothiazines / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D004396:Coloring Agents; D003497:Cyclic N-Oxides; D007454:Iodides; D010640:Phenothiazines; C031637:phenothiazine; C003959:TEMPO
keywords: energy conversion; ionic liquids; metal-free; sensitizers; solar cells