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We confirmed methyl termination on
n-Si(111) surface by ATR-FTIR measurement, which was fabricated by a photo
chloro-reaction and its methylation. The coverage of the methylation was about
63.7%, and the surface was not re-terminated by hydrogen. Photoelectrochemical properties of the n-Si(111) were measured as an electrode for a photoelectrochemical cell, and an onset
potential obtaining photocurrent for the methyl terminated n-Si(111) electrode
was observed as
negative shift at 70 mV comparing with that of the hydrogen terminated
n-Si(111) electrode. Therefore, the negative shift would be expected for
improving open circuit voltage towards solar cell.
An electrode development was needed
with high efficiency and low costs as next generation solar cells. We attempted
the electrode fabrication for a photoelectrochemical cell by immobilizing
functional groups on a n-Si(111) surface. The immobilization was applied by
hydrosilylation terminated with ester (hydrophobic) or carbonyl (hydrophilic)
group. Results confirmed the immobilization on the Si surface by measuring
ATR-FTIR and XPS.
Development of novel functional devices has been expected by modification
for Si surface. This study investigated immobilization and roles of the Si
surface with flowing surfactant by in situ ATR-FTIR method. This result
suggested that the surfactant prevented oxidation of the hydrogen-terminated Si
surface from the higher concentration in aqueous solution. These would guard
the Si surface against H2O molecules.