Journal
RSC ADVANCES
Volume 2, Issue 8, Pages 3467-3472Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra01251k
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Funding
- MKE [M2009010025]
- NRF
- MEST [2010-0000406, 2010-0019119]
- BK21 (Brain Korea 21)
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3,4,5-Tris(dodecyloxy) benzoic acid (DOBA) and the Z907 dye were coadsorbed to form a light-sensitizing monolayer in a solid-state dye-sensitized solar cell (sDSC). Coadsorption of DOBA which has three hydrocarbon chains permitted preparation of a denser monolayer of dyes and DOBA. This dense monolayer formed interlayer between TiO2 and Spiro-OMeTAD (hole conductor), effectively preventing charge recombination, while half of the photocurrent was dissipated via recombination reaction when Z907 solely anchored on the surface of TiO2. Moreover, the DOBA induced a lower population of density-of-state (DOS) in the surface of TiO2, shifting the position of the conduction band (CB) toward negative values. This resulted in higher open-circuit voltage (V-OC) for the device made with Z907 and DOBA than that of the Z907-sensitized device. These surface properties were investigated using electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent/photovoltage spectroscopy (IMPS and IMVS).
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