Direct measurement of conduction miniband structure in superlattice by visible-light photoemission spectroscopy

Author

Ichihashi, Fumiaki ; Shimura, Daisuke ; Nishitani, Kenji ; Kawaguchi, Tatsuki ; Kuwahara, Masashi ; Ito, Takao ; Harada, Shingo ; Katsuno, Hiroyasu ; Tagawa, Masaki ; Ujihara, Toru

Author_Institution

Dept. of Mater. Sci. & Eng., Nagoya Univ., Nagoya, Japan

fYear

2014

fDate

8-13 June 2014

Firstpage

2882

Lastpage

2885

Abstract

We have proposed a novel angle-resolved photoemission spectroscopy to measure the conduction electrons emitted from a surface with negative electron affinity state. We call this method visible-light photoemission spectroscopy (VPS). In the present study, the conduction miniband structure formed in a superlattice was evaluated by the VPS method. As a result, we succeeded to obtain the dispersion of the miniband. In addition, the effective mass of the miniband was quantitatively determined from the observed dispersion. Therefore, we believe that VPS is a quite powerful tool for the evaluation of intermediate-band solar cells.

Keywords

aluminium compounds; conduction bands; effective mass; electron affinity; gallium arsenide; indium compounds; photoelectron spectra; semiconductor quantum wells; semiconductor superlattices; InGaAs-AlGaAs; angle-resolved photoemission spectroscopy; conduction electrons; conduction miniband structure; effective mass; miniband dispersion; negative electron affinity state; superlattice; visible-light photoemission spectroscopy; Dispersion; Energy measurement; Epitaxial growth; Epitaxial layers; Indexes; Optical variables measurement; Thickness measurement; intermediate-band solar cells; negative electron affinity surface; photoemission spectroscopy; superlattice structure;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th

Conference_Location

Denver, CO

Type

conf

DOI

10.1109/PVSC.2014.6925534

Filename

6925534