Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 38, Pages 11842-11847Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12681a
Keywords
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Funding
- Global Research Laboratory (GRL) Program
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Education, Science and Technology of Korea
- Korea Research Institute of Chemical Technology (KRICT), Republic of Korea
- Center for Advanced Molecular Photovoltaics [KUS-C1-015- 21]
- CE-Mesolight EPFL ECR advanced grant [247404]
- King Abdullah University of Science and Technology (KAUST)
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For using 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) as a hole conductor in solar cells, it is necessary to improve its charge-transport properties through electrochemical doping. With the aim of fabricating efficient mesoscopic TiO2/CH3NH3PbI3 heterojunction solar cells, we used tris[2-(1H-pyrazol-1-yl)-4-tert-butylpyridine)cobalt(III) tris(bis(trifluoromethylsulfonyl) imide)] (FK209) as a p-dopant for spiro-OMeTAD. The mixture of spiro-OMeTAD, FK209, lithium bis(trifluoromethylsulfonyl)imide (Li-TFSI), and 4-tert-butylpyridine (TBP) exhibited significantly higher performance than mixtures of pristine spiro-OMeTAD, spiro-OMeTAD, and FK209, and spiro-OMeTAD, Li-TFSI, and TBP. Such a synergistic effect between the Co-complex and Li-TFSI in conjunction with spiro-OMeTAD effectively improved the power conversion efficiency (PCE) of the fabricated solar cells. As a result, we achieved PCE of 10.4%, measured under standard solar conditions (AM 1.5G, 100 mW cm(-2)).
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