2013 Fiscal Year Final Research Report

Development of the solar cells using the ferroelectric semiconductor heterointerface

Research Project

Project/Area Number	24760545
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Inorganic materials/Physical properties
Research Institution	University of Yamanashi
Principal Investigator	YANAGI Hiroshi 山梨大学, 医学工学総合研究部, 准教授 (30361794)
Project Period (FY)	2012-04-01 – 2014-03-31
Keywords	太陽電池 / 強誘電体
Research Abstract	BiFeO3 epitaxial films were prepared by hydrothermal synthesis method on the SrTiO3 single crystalline substrates. The resistance of the BiFeO3 epitaxial films was too large to measure ultraviolet photoelectron spectroscopy for determining the band diagram (the energy positions of the conduction band minimum and the valence band maximum) and too small to polarize them. Then, polarized BaTiO3 was employed as the test sample for the confirmation of the band slope induced by the polarization: clear band slope was observed by XPS measurements with a low-energy electron flood gun. As a result, open-circuit voltage which is larger than the band gap energy can be expected in polarized ferroelectric solar cells.

(3 results)