Masahiro Hiramoto
Institute for Molecular Science, Japan
Title: Band gap science for organic solar cells
Biography
Biography: Masahiro Hiramoto
Abstract
Conversion efficiency of organic thin-film solar cell reached 12%. In 1991, I proposed pin junction incorporating codeposited i-interlayer consisting of two kinds of organic semiconductors (so-called bulk heterojunction), which is an indispensable for present organic solar cells. In this paper, band gap science for organic thin-film solar cells including: Sevennines purification of organic semiconductors; p-n-control of organic semiconductors by impurity doping; doping mechanisminvestigated by Kelvin band-mapping; p-n-control of the photovoltaic co-deposited films; ionization sensitization of doping and; ppm-doping effects in the simplest n+p- homo junction organic photovoltaic cells will be presented.