Dependences of the optical absorption and interfacial electron transfer dynamics of quantum dots adsorbed on singlecrystal rutile TiO2.

2017 Fiscal Year Final Research Report

• Project/Area Number: 26390016
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials chemistry
• Research Institution: The University of Electro-Communications
• Principal Investigator: Toyoda Taro 電気通信大学, その他部局等, 名誉教授 (40217576)
• Co-Investigator(Kenkyū-buntansha): 沈 青 電気通信大学, 大学院情報理工学研究科, 教授 (50282926)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 量子ドット / 量子閉じ込め効果 / 光音響法 / 光電子収量法 / 過渡回折格子法 / ルチル型酸化チタン / セレン化カドミウム

Outline of Final Research Achievements

Quantum dots (QDs) provide an attractive alternative sensitizer to organic dyes. There is a lack of fundamental studies of QD on conventional nanocrystalline TiO2 electrodes with much amount of heteroigeneity. We have shown the dependences of the optical absorption, the ground state energy level, and interfacial electron transfer dynamics on the size of CdSe QDs on single crystal rutile-TiO2. The expenential optical absorption tail indicates a decrease in structural disorder with increasing size. The ground state energy level of the CdSe QDs shows anisotropic, depending on the surface orientation of TiO2. The interfacial electron transfer rate constant decreases with increasing size and depends on the surface orientation of TiO2.

Free Research Field

半導体量子ドットにおける光エネルギー変換