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色素増感太陽電池の高効率化において，その構成要素であるTiO2多孔質電極，色素の吸着，電解液組成の検討を行った。色素増感太陽電池は，ポーラスなTiO2多孔質電極を用いることにより色素吸着量が高くなり，高い変換効率を示す。高温で色素吸着を行うと，吸着量は向上するが，色素の凝集が起こるため，短絡電流が低下する。また，短絡電流が電解液のイオン導電率に比例することがわかった。これらにより，変換効率8%を達成した。結晶シリコン太陽電池並みの変換効率を達成するには，色素のブロードバンド化の研究開発が必要である。
A TiO2 porous light electrode, absorption of a dye and composition of electrolyte were investigated for the improvement in energy conversion efficiency of the dye-sensitized solar cell. It is found that increase in the porosity of TiO2 porous light electrode causes increase in the efficiency because more dye is absorbed on the electrode. Dye uptake increases with absorption temperature, when the temperature is over 90℃, however, short circuit current (Jsc) decreases because of dye aggregation. It is also found that high Jsc can be obtained by increasing the ionic conductivity of electrolyte.
Finally, the efficiency of 8% was obtained. It is necessary to develop a new dye with broad absorbance in order to obtain the efficiency as high as silicon solar cell.
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