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 %.
|頁（從 - 到）||44-48|
|期刊||Materials Research Society Symposium Proceedings|
|出版狀態||Published - 2007|
|事件||Organic and Nanoparticle Hybrid Photovoltaic Devices - 2007 MRS Spring Meeting - San Francisco, CA, United States|
持續時間: 2007 4月 9 → 2007 4月 13
All Science Journal Classification (ASJC) codes