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Featured researches published by Feifei Gao.


Journal of the American Chemical Society | 2008

Enhance the Optical Absorptivity of Nanocrystalline TiO2 Film with High Molar Extinction Coefficient Ruthenium Sensitizers for High Performance Dye-Sensitized Solar Cells

Feifei Gao; Yuan Wang; Dong Shi; Jing Zhang; Mingkui Wang; Xiaoyan Jing; Robin Humphry-Baker; Peng Wang; Shaik M. Zakeeruddin; Michael Grätzel

We report two new heteroleptic polypyridyl ruthenium complexes, coded C101 and C102, with high molar extinction coefficients by extending the pi-conjugation of spectator ligands, with a motivation to enhance the optical absorptivity of mesoporous titania film and charge collection yield in a dye-sensitized solar cell. On the basis of this C101 sensitizer, several DSC benchmarks measured under the air mass 1.5 global sunlight have been reached. Along with an acetonitrile-based electrolyte, the C101 sensitizer has already achieved a strikingly high efficiency of 11.0-11.3%, even under a preliminary testing. More importantly, based on a low volatility 3-methoxypropionitrile electrolyte and a solvent-free ionic liquid electrolyte, cells have corresponding >9.0% and approximately 7.4% efficiencies retained over 95% of their initial performances after 1000 h full sunlight soaking at 60 degrees C. With the aid of electrical impedance measurements, we further disclose that, compared to the cell with an acetonitrile-based electrolyte, a dye-sensitized solar cell with an ionic liquid electrolyte shows a feature of much shorter effective electron diffusion lengths due to the lower electron diffusion coefficients and shorter electron lifetimes in the mesoporous titania film, explaining the photocurrent difference between these two type devices. This highlights the next necessary efforts to further improve the efficiency of cells with ionic liquid electrolytes, facilitating the large-scale production and application of flexible thin film mesoscopic solar cells.


Journal of the American Chemical Society | 2008

An Organic Sensitizer with a Fused Dithienothiophene Unit for Efficient and Stable Dye-Sensitized Solar Cells

Hao Qin; Sophie Wenger; Mingfei Xu; Feifei Gao; Xiaoyan Jing; Peng Wang; Shaik M. Zakeeruddin; Michael Grätzel

We report a high molar extinction coefficient organic sensitizer for high efficiency dye-sensitized solar cells. In combination with a solvent-free ionic liquid electrolyte, we have demonstrated a approximately 7% cell showing an excellent stability measured under the thermal and light soaking dual stress. This is expected to have an important practical consequence on the production of flexible, low-cost, and lightweight DSC based on plastic matrix.


Inorganic Chemistry | 2009

Conjugation of Selenophene with Bipyridine for a High Molar Extinction Coefficient Sensitizer in Dye-Sensitized Solar Cells

Feifei Gao; Yueming Cheng; Qingjiang Yu; Shi Liu; Dong Shi; Yunhui Li; Peng Wang

A high molar extinction coefficient heteroleptic polypyridyl ruthenium sensitizer, featuring a conjugated electron-rich selenophene unit in its ancillary ligand, has been synthesized and demonstrated as an efficient sensitizer in dye-sensitized solar cells. A nanocrystalline titania film stained with this sensitizer shows improved optical absorptivity, which is highly desirable for dye-sensitized solar cells with a thin photoactive layer. With preliminary testing, this sensitizer has already achieved a high efficiency of 10.6% measured under the air mass 1.5 global conditions.


Journal of Physical Chemistry C | 2009

Dye-Sensitized Solar Cells with a High Absorptivity Ruthenium Sensitizer Featuring a 2-(Hexylthio)thiophene Conjugated Bipyridine

Yiming Cao; Yu Bai; Qingjiang Yu; Yueming Cheng; Shi Liu; Dong Shi; Feifei Gao; Peng Wang


Chemical Communications | 2008

A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cell

Feifei Gao; Yuan Wang; Jing Zhang; Dong Shi; Mingkui Wang; Robin Humphry-Baker; Peng Wang; Shaik M. Zakeeruddin; Michael Grätzel


Advanced Materials | 2008

High-Performance Liquid and Solid Dye-Sensitized Solar Cells Based on a Novel Metal-Free Organic Sensitizer

Mingkui Wang; Mingfei Xu; Dong Shi; Renzhi Li; Feifei Gao; Guangliang Zhang; Zhihui Yi; Robin Humphry-Baker; Peng Wang; Shaik M. Zakeeruddin; Michael Grätzel


Archive | 2009

HIGH MOLECULAR EXTINCTION COEFFICIENT METAL DYES

Feifei Gao; Yuan Wang; Jing Zhang; Peng Wang; Shaik M. Zakeeruddin; Michael Graetzel


Archive | 2010

Pure organic dyestuff and dyestuff sensitization solar energy battery prepared therefrom

Zuckrudin Seke; Feifei Gao; Mingfei Xu; Hao Qin; Peng Wang; Glazer Michael


Archive | 2012

Organic dye-stuff with multi-heterocycle derivant as conjugation unit and dye sensitized solar battery produced with the same

Mingfei Xu; Feifei Gao; Peng Wang; Guangliang Zhang


Archive | 2011

Organic dyes using quinoline carboxylic acid as receptor and dye sensitized solar energy cell prepared by thereof

Michel Grether; Peng Wang; Yueming Cheng; Feifei Gao

Collaboration


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Peng Wang

Chinese Academy of Sciences

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Mingfei Xu

Chinese Academy of Sciences

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Dong Shi

King Abdullah University of Science and Technology

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Yueming Cheng

Chinese Academy of Sciences

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Michael Grätzel

École Polytechnique Fédérale de Lausanne

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Shaik M. Zakeeruddin

École Polytechnique Fédérale de Lausanne

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Jing Zhang

Chinese Academy of Sciences

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Mingkui Wang

Huazhong University of Science and Technology

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Qingjiang Yu

Chinese Academy of Sciences

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Robin Humphry-Baker

École Polytechnique Fédérale de Lausanne

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