Research and development of next-generation inorganic solar cells using interfacial charge-transfer transitions as a novel operating principle

2015 Fiscal Year Final Research Report

• Project/Area Number: 25620054
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Functional solid state chemistry
• Research Institution: Gunma University (2014-2015); The University of Tokyo (2013)
• Principal Investigator: Fujisawa Jun-ichi 群馬大学, 大学院理工学府, 准教授 (20342842)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 太陽電池 / 光エネルギー変換 / 界面

Outline of Final Research Achievements

Interfacial charge-transfer transitions enable direct photoinduced charge separation without loss of energy. In this work, we found that interfacial charge-transfer transitions take place from the surface-bound sulfur atoms on TiO2 to the conduction band of TiO2 in a TiO2-benzenedithiol surface complex. In addition, I applied this material to photovoltaic cells. We observed that photoelectric conversion occurs by the surfur-to-TiO2 interfacial charge-transfer transitions with an internal quantum efficiency of about 65%. This result reveals the possibility that a new hybrid material for ICT transitions can be produced by combining titanium dioxide with sulfur-containing compounds.

Free Research Field

光化学