A novel efficient, iodide-free redox mediator for dye-sensitized solar cells

Zhipan Zhang; Peter Chaoyu Chen; Shaik Mohammed Zakeeruddin; Jacques Edouard Moser; Michael Grätzel

doi:10.1557/proc-1013-z06-02

A novel efficient, iodide-free redox mediator for dye-sensitized solar cells

Zhipan Zhang, Peter Chaoyu Chen, Shaik Mohammed Zakeeruddin, Jacques Edouard Moser, Michael Grätzel

Department of Photonics

Research output: Contribution to journal › Conference article › peer-review

Abstract

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 %.

Original language	English
Pages (from-to)	44-48
Number of pages	5
Journal	Materials Research Society Symposium Proceedings
Volume	1013
DOIs	https://doi.org/10.1557/proc-1013-z06-02
Publication status	Published - 2007
Event	Organic and Nanoparticle Hybrid Photovoltaic Devices - 2007 MRS Spring Meeting - San Francisco, CA, United States Duration: 2007 Apr 9 → 2007 Apr 13

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/proc-1013-z06-02

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title = "A novel efficient, iodide-free redox mediator for dye-sensitized solar cells",

abstract = "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 %.",

author = "Zhipan Zhang and Chen, {Peter Chaoyu} and Zakeeruddin, {Shaik Mohammed} and Moser, {Jacques Edouard} and Michael Gr{\"a}tzel",

year = "2007",

doi = "10.1557/proc-1013-z06-02",

language = "English",

volume = "1013",

pages = "44--48",

journal = "Materials Research Society Symposium Proceedings",

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publisher = "Materials Research Society",

note = "Organic and Nanoparticle Hybrid Photovoltaic Devices - 2007 MRS Spring Meeting ; Conference date: 09-04-2007 Through 13-04-2007",

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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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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 -

A novel efficient, iodide-free redox mediator for dye-sensitized solar cells

Abstract

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