TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The photoelectric converter includes an insulator layer or a semiconductor layer as a blocking layer between the conductive substrate and the semiconductor electrode. Preferred Dimension: The semiconductor electrode is 100-10000 nm thick. The charge transport layer is 0.1-20 microns thick.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The antioxidant comprises a hindered amine or a hindered phenol. Preferred Composition: The weight content of the antioxidant is 0.01-20 wt.%, based on the weight of the charge transport layer. Preferred Property: The charge transport layer comprises a charge transport material having a molecular weight of 750-100000.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The charge transport layer comprises a polymer charge transport material and the antioxidant. It does not comprises binder resin. The polymer charge transport material is a conductive polymer. EXAMPLE - N N'-bis(3,4-dimethylphenyl)-3,3'-dimethylbiphenyl-4,4'-diamine (10 g), 4-ethoxycarbonylethyl-4'-iodophenyl (24 g), potassium carbonate (11 g), 11.0 g of copper sulfate pentahydrate (11 g), and 30 ml of n-tridecane (30 ml) were charged and reacted in flask (200 ml) at 230degreesC for 1 hour under a nitrogen atmosphere. The product was cooled and dissolved in toluene (10 ml). Insoluble substance was removed by filtering. The product was purified to give 15.2 g of oily N N'-bis(3,4-dimethylphenyl)-N N'-bis-4-ethoxy carbonylethylphenyl(1-1'-biphenyl)-4,4'-diamine. The diamine (10 g) having two ester groups was put into flask (100 ml), a solution of potassium hydroxide (2 g)dissolved in ethylene glycol (50 ml) was added. The mixture was reacted at 150degreesC for one hour under a nitrogen gas flow. After the reaction, the obtained liquid was cooled and hydrochloric acid was added until the liquid turned to acidic, formed precipitate was separated by filtering, washed with distilled water, and dried to obtain charge transport material (8.1 g) having two carboxyl groups. Photoelectric converter was prepared by placing a transparent conductive glass plate as a counter electrode on each charge transport material layer. The transparent conductive glass plate was prepared by coating fluorine-doped tin oxide on a glass plate followed by coating platinum. The photoelectric converter was used to prepare solar cells and evaluated. The solar cell had Irganox 1010(RTM: hindered phenol) having 516 molecular weight, Bisphenol Z type polycarbonate binder, photoelectric conversion efficiency of 0.21%, and decrease ratio of 14%.