Development of new solar cell based on photosynthesis type double excitation

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Objective of this study is to develop new concept of solar cell based on double excitation in organic and inorganic semiconductor composite, that is similar with photosynthesis. In contrast to the conventional solar cell, the objective solar cell exhibits high electromotive forces by using excitation in organic and inorganic semiconductor. For the case of inorganic semiconductor, we found that ZnO nano tube array deposited by hydrothermal synthesis method shows large electromotive forces of 0. 5 V under irradiation of 500 W Xenon lump.On the other hand, among various organic dyes, it was found that Cuphthalocyanine and 2-amino anthraquinone shows relatively large photocurrent. However, in case of 2-amino anthraquinone is decomposed by electrolysis at 1. 0V. Therefore, the optimized dye for solar cell is Cu-phthalocyanine. Combination of ZnO and Cu-phthalocyanine electrodes shows 0. 7 V for open circuit potential and 1mA/cm2 short circuit current. The current issues is to high resistance of organic dye nd so improvement of organic dye electrode could improve the power generation property of new type solar cells. This study reveals that the concept of double excitation is used for solar cells with high efficiency.