Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106183
Title: Cobalt dopant with deep redox potential for organometal halide hybrid solar cells
Authors: Mhaisalkar, Subodh Gautam
Grimsdale, Andrew C.
Li, Hairong
Koh, Teck Ming
Dharani, Sabba
Prabhakar, Rajiv Ramanujam
Mathews, Nripan
Keywords: DRNTU::Science::Chemistry::Physical chemistry
Issue Date: 2014
Source: Koh, T. M., Dharani, S., Li, H., Prabhakar, R. R., Mathews, N., Grimsdale, A. C., et al. (2014). Cobalt Dopant with Deep Redox Potential for Organometal Halide Hybrid Solar Cells. ChemSusChem, 7(7), 1909–1914.
Series/Report no.: ChemSusChem
Abstract: 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 incorporating 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.
URI: https://hdl.handle.net/10356/106183
http://hdl.handle.net/10220/19633
ISSN: 1864-5631
DOI: 10.1002/cssc.201400081
Rights: © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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