The dye sensitized solar cell, whose production is easy and cheap, is expected as a low cost solar cell. The aluminum-doped zinc oxide film and titanium oxide film are used as an electrode of a dye sensitized solar cell,. The dye adheres to this electrode and emits electrons. The formation of an electrode with large surface area, therefore, leads to production of a highly efficient solar cell. Researches of the electrode of porosity or whiskers are actually done widely. In this study, we produced the zinc oxide nanorod electrodes with large surface area for a dye sensitized solar cell by the gas evaporation method, which is one of the methods of producing metal ultrafine particles [1].

We used the powder Zn containing 2 wt% powder aluminum as the evaporation source materials. Ar atmosphere gas of pressure 0.01~0.8 atm was enclosed in the vacuum chamber evacuated to 4 Pa with the rotary pump. The nanorod film was deposited on the slide glass substrate, which was heated at 300~550 ^oC with a ceramic heater. The prepared film was observed with the scanning electron microscope. The nanorod wound intricately rather than was straight. The diameter of the nanorod was controlled by distance of an evaporation source and a substrate in 100 to 1000 nm. After the sample oxidized at 460-520 ^oC in the air, it was investigated by x-ray diffraction. The oxidized film was nonconductive. Therefore, 2 wt% aluminum-doped zinc oxide was sputtered on the film to have conductivity. The efficiency of the dye sensitized solar cell using this electrode will be discussed at the presentation.

 [1] M.Dohi et al. Jpn. J. Appl. Phys. 29, 2445(1990).

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