NOVELTY - An organic thin-film photovoltaic cell comprises a transparent conductor layer (1); a hole transport layer (2) formed on the transparent conductor layer; a photoelectric conversion layer (8) formed on the hole transport layer; an electron transport layer (4, 5) formed on the photoelectric conversion layer; and a counter electrode (6) formed on the electron transport layer. The photoelectric conversion layer is made of a mixture of a p-type semiconductor molecule or p-type polymer and an n-type semiconductor molecule. The electron transport layer contains the n-type semiconductor molecule.    USE - An organic thin-film photovoltaic cell.    ADVANTAGE - The recombination (leakage current) occurring between a bulk heterojunction layer and the counter electrode can be suppressed without increasing the internal series resistance, thus improving the photoelectric conversion efficiency.    DETAILED DESCRIPTION - An organic thin-film photovoltaic cell comprises a transparent conductor layer (1); a hole transport layer (2) formed on the transparent conductor layer; a photoelectric conversion layer (8) formed on the hole transport layer; an electron transport layer (4, 5) formed on the photoelectric conversion layer; and a counter electrode (6) formed on the electron transport layer. The photoelectric conversion layer is made of a mixture of a p-type semiconductor molecule or p-type polymer and an n-type semiconductor molecule. The electron transport layer contains the n-type semiconductor molecule. The p-type semiconductor molecule or p-type polymer contained in the photoelectric conversion layer and exposed at an interface between the photoelectric conversion layer and the electron transport layer is in contact with the n-type semiconductor molecule contained in the electron transport layer.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic vertical sectional view illustrating the organic thin-film photovoltaic cell.    Transparent conductor layer (1)    Hole transport layer (2)    Electron transport layer (4, 5)    Counter electrode (6)    Photoelectric conversion layer (8)