期刊
CHEMSUSCHEM
卷 7, 期 7, 页码 1909-1914出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201400081
关键词
cobalt complex; electrochemistry; dye-sensitized solar cells; perovskites; redox potential
资金
- National Research Foundation (NRF), Singapore through CRP [NRF-CRP4-2008-03]
- Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE) CREATE programme
In this work, we report a new cobalt(III) complex, tris[2-(1H-pyrazol-1-yl) pyrimidine] cobalt(III) tris[bis(trifluoromethylsulfonyl)imide] (MY11), with deep redox potential (1.27 V vs NHE) as dopant for 2,2', 7,7'-tetrakis-(N, N-di-p-methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). This dopant possesses, to the best of our knowledge, the deepest redox potential among all cobalt-based dopants used in solar cell applications, allowing it to dope a wide range of hole-conductors. We demonstrate the tuning of redox potential of the Co dopant by in-corporating pyrimidine moiety in the ligand. We characterize the optical and electrochemical properties of the newly synthesized dopant and show impressive spiro-to-spiro(+) conversion. Lastly, we fabricate high efficiency perovskite-based solar cells using MY11 as dopant for molecular hole-conductor, spiro-OMeTAD, to reveal the impact of this dopant in photovoltaic performance. An overall power conversion efficiency of 12% is achieved using MY11 as p-type dopant to spiro-OMeTAD.
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