| Abstract
| - In this paper, a nanoporous TiO2 electrode modified with an insulating materialBaCO3is synthesized forquasi-solid-state dye-sensitized solar cells (DSSCs). The formation of BaCO3 is confirmed from the X-rayphotoelectron spectrum (XPS) and Fourier transform infrared (FTIR) spectrum, while the components of themodified TiO2 film are studied by electron-probe microanalysis (EPMA). We find that BaCO3 modificationremarkably increases dye adsorption, resulting from the fact that the surface of BaCO3 is more basic thanthat of TiO2. When applied to quasi-solid-state DSSCs, BaCO3-modified TiO2 electrodes have an increasedopen-circuit photovoltage (Voc) and improved overall conversion efficiency (η). The η value improves from5.53 to 6.96% by 25.9% under 30 mW/cm2. The mechanism of BaCO3 modification is analyzed using thetransient photovoltage spectra, open-circuit photovoltage spectra, and dark current measurement. The resultsindicate that in the presence of BaCO3, the TiO2 conduction band shifts to the negative direction.
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