Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 44, Pages 22492-22496Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp406506d
Keywords
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Funding
- Ministry of Science and Technology of China (863) [SS2013AA50303]
- National Natural Science Foundation of China [61106056]
- fundamental Research Funds for the Central Universities [HUSTNY022]
- Scientific Research Foundation for Returned Scholars, Ministry of Education of China
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The Lewis acid SnCl4 is employed as a p-type dopant for 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) for the solution process in solid-state dye sensitized solar cell. The UV-vis absorption spectra and time-resolved photoluminescence (PL) spectra are used to investigate the doping level of spiro-OMeTAD with a p-type dopant, indicating the strong molecular acceptor of SnCl4. X-ray photoelectron spectra (XPS) exhibiting close energy shifts of the Fermi level toward HOMO are observed when adding Li salt or SnCl4. A significant enhancement in fill factor of the photovoltaic devices, corresponding to the power conversion efficiency, is observed when doping with SnCl4. This is attributed to the low charge transport resistance of the hole transport film and high hole injection efficiency from the hole transport material to the counter electrode.
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