Victor ReshetnyakPhysics Faculty Kiev Taras Shevchenko Shevchenko, Pr. Glushkova, 6, Kyiv, 03680, UkraineWe have carried out experiments that indicate a surface-charge-mediated photorefractive effect in nominally pure liquid crystal homeotropically aligned on ITO-electrodes. We suggest that interfering beams modulate distribution of the charges in a layer of LC molecules adsorbed by the ITO-electrodes surfaces. It results in a tangential component of dc-field applied to the cell which re-arranges liquid crystal molecules in the adsorbed layer. This re-arrangement causes an easy axis modulation and the grating recording. A bulk-mediated mechanism related to an instability induced by the dc-field may give a contribution to the grating formation in specific range of the recording parameters.