TY - JOUR
T1 - A novel efficient, iodide-free redox mediator for dye-sensitized solar cells
AU - Zhang, Zhipan
AU - Chen, Peter Chaoyu
AU - Zakeeruddin, Shaik Mohammed
AU - Moser, Jacques Edouard
AU - Grätzel, Michael
PY - 2007
Y1 - 2007
N2 - A stable organic molecular radical, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), has been electrochemically studied and employed as a new redox mediator in nanocrystalline TiO2 dye-sensitized solar cells (DSCs) when it is doped with nitrosonium tetrafluoroborate (NOBF4). Reasonable photocurrents can be achieved despite of driving force of only 0.2 eV for the TEMPO/TEMPO+ system as compared to 0.6 eV for the iodide/triiodide redox system. Judicious selections of a 5 μm photoanode made from TiO 2 mesoscopic particles (60 nm in diameter) and an organic sensitizer with high molar extinction coefficient yield an overall power conversion of 5.0 % under AM 1.5 illumination at 100 mW cm-2 and an incident photon-to-current conversion efficiencies (IPCE) in excess of 50 %.
AB - A stable organic molecular radical, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), has been electrochemically studied and employed as a new redox mediator in nanocrystalline TiO2 dye-sensitized solar cells (DSCs) when it is doped with nitrosonium tetrafluoroborate (NOBF4). Reasonable photocurrents can be achieved despite of driving force of only 0.2 eV for the TEMPO/TEMPO+ system as compared to 0.6 eV for the iodide/triiodide redox system. Judicious selections of a 5 μm photoanode made from TiO 2 mesoscopic particles (60 nm in diameter) and an organic sensitizer with high molar extinction coefficient yield an overall power conversion of 5.0 % under AM 1.5 illumination at 100 mW cm-2 and an incident photon-to-current conversion efficiencies (IPCE) in excess of 50 %.
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U2 - 10.1557/proc-1013-z06-02
DO - 10.1557/proc-1013-z06-02
M3 - Conference article
AN - SCOPUS:70349914392
SN - 0272-9172
VL - 1013
SP - 44
EP - 48
JO - Materials Research Society Symposium Proceedings
JF - Materials Research Society Symposium Proceedings
T2 - Organic and Nanoparticle Hybrid Photovoltaic Devices - 2007 MRS Spring Meeting
Y2 - 9 April 2007 through 13 April 2007
ER -