Abstract: A solar battery is formed by forming a film of a specific merocyanine dye on an n-type semiconductor substrate thereby producing a p-n junction in the interface between the dye film and the semiconductor substrate and connecting electrodes one each to the two layers.

Abstract: To photosynthetizing living organisms such as spinach was added an organic olvent selected from the group consisting of methyl alcohol, acetone, methyl ethyl ketone and butylcarbitol in a weight amount of 3 - 8 times as much as the living organisms and the mixture is thoroughly triturated and then treated by the following route: after removal of insoluble matters, the liquid is admixed with dioxane in a volumetric amount of 1/8- 1/8 of the volume of the organic solvent and then with a phosphate buffer solution until the liquid becomes turbid, and thereafter allowed to stand in a cooled dark place, and the precipitated crystalline chlorophyll is separated from the solution.