Organic memory cells have been constructed utilizing conducting polymer, poly(3-hexylthiophene), PHT. The PHT film with Au electrodes at the bottom was coated with ultra thin Al having the thickness of 1 nm on the top. The cell showed the large photoconductivity, which was measured between Au bottom electrodes. The photoconductivity lasted for several hours after turn off the illumination, indicating photo induced memory effect. The phenomenon is discussed in terms of the persistent photoconduction, which is resulted from the electron trapping at Al donor sites in the depletion layer formed near the top of film.