[13p-B4-1~8] 12.5 Organic solar cells

[13p-B4-2] Photoinduced electron transfer of CdSe QDs / single crystal rutile TiO₂ sensitization system: size dependence of the transfer rate constant and the transfer component

〇Taro Toyoda^1,6, Witoon Yindeesuk¹, Keita Kamiyama², Kenji Katayama³, Hisayoshi Kobayashi⁴, Shuzi Hayase^5,6, Qing Shen^1,6 (1.Univ. Electro-Commun., 2.Bunkoukeiki Co. Ltd, 3.Chuo Univ., 4.Kyoto Inst. Tech., 5.Kyushu Inst. Tech., 6.JST-CREST)

Keywords:quantum dot, photoinduced electron transfer, quantum dot sensitized solar cell

Semiconductor quantum dots (QDs) have many desirable characteristics. Despite the potential advantages, no major advance in the efficiency of quantum-dot-sensitized solar cells (QDSCs) has yet been reported. The poor efficiency can be attributed to photoinduced electron-transfer (ET) reactions. We describe the photoinduced ET of CdSe QDs on single crystal rutile TiO₂ with different crystal orientations. The photoinduced ET rate constant decreases as the QD size increases, although the crystal quality of the QD increases. The component of the photoinduced ET increases with the increase of the QD size. The crystal quality, ET rate constant, and the component depend on the crystal orientation of the substrate.