Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 34, Pages 15417-15421Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp905366t
Keywords
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Funding
- Ministry of Education of P.R. China, Shanghai Pujiang Program [09pj 1401300]
- State Key Laboratory of Fine Chemicals, Dalian University of Technology [KF0606]
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This paper quantitatively describes how HCl-treatment of nanocrystalline TiO2 films prior to dye adsorption influences charge recombination and conduction band edge movement of dye sensitized solar cells based on dye N749 (the so-called black dye), [(C4H9)(4)N](3)[Ru(Htcterpy)(NCS)(3)] (tcterpy = 4,4',4 ''-tricarboxy-2,2': 6',2 ''-terpyridine), using intensity modulated photovoltage spectroscopy (IMVS). The surface protonation of TiO2 films causes a positive shift of the conduction build edge by 28 mV, corresponding to a decrease in open-circuit photovoltage (V-oc) by 28 in mV, and a slower charge recombination rate constant by a factor of 5, corresponding to an increase in V-oc by 50 mV. The experimentally observed V-oc enhancement (19 mV) by surface protonation of TiO2 films is in good agreement with the collective effect (50 mV - 28 mV = 22 mV) of both a positive shift of the conduction band edge and a slower charge recombination. These data indicate that surface protonation of TiO2 can simultaneously improve J(sc) due to the positive shift of conduction band edge and V-oc due to the suppression of charge recombination.
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