The conductivity of a silver salt of N,N'-dicyanoquinonediimine irreversibly varied in approximate proportion to an illumination of a wide range of wavelengths. Depending on the illumination conditions, four different states (beta, gamma, delta, and epsilon) were obtained with different structures. The b structure is in particular important, where the formal charge of the N,N'-dicyanoquinonediimine molecules continuously decreased to -0.4 - -0.35 with retaining the crystal structure, when we kept the temperature < 155 degrees C during the illumination. The non-illuminated area of the sample retained its original electrical property with a well-defined interface, which enabled a fabrication of a junction-structure in the single crystal.