The modification of stearic acid-coumarin Langmuir-Blodgett (LB) films prepared from a coumarin derivative and stearyl chloride on the performance of n-Si/Ni electrode was studied. The deposition of the LB film was Z-type. There was a shift of absorption peak (from 343 nm to 325 nm) after the film was perpared on a glass plate. Under the illumination of 60 m W.cm-2 bromine-tungsten lamp light, the energy conversion efficiency of n-Si/Ni/3LB/Fe(CN)63-/4-/Pt cell has been increased by 100% and the stability was apparently enhanced. The a.c. impedance measurement has shown that the charge transfer resistance of n-Si/Ni/3LB electrode decreased greatly under the irradiation The research results indicates that the modification of stearic acid-coumarin LB films on the photoelectron transfer process on n-Si/Ni electrode is good.

Key words: SILICON, NICKEL, COUMARIN P, ELECTRO-DEPOSITION, CHEMICAL MODIFIED ELECTRODE, STEARIC ACID P, CHARGE TRANSFER, SEMICONDUCTOR ELECTRODE, L-B MEMBRANE, FUEL CELL