Experimental determination of band offsets of NiO-based thin film heterojunctions

Daisuke Kawade, Shigefusa F. Chichibu, Mutsumi Sugiyama

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The energy band diagrams of NiO-based solar cell structures that use various n-type oxide semiconductors such as ZnO, Mg0.3Zn0.7O, Zn0.5Sn0.5O, In2O3:Sn (ITO), SnO2, and TiO2 were evaluated by photoelectron yield spectroscopy. The valence band discontinuities were estimated to be 1.6 eV for ZnO/NiO and Mg0.3Zn0.7O/NiO, 1.7 eV for Zn0.5Sn0.5O/NiO and ITO/NiO, and 1.8 eV for SnO2/NiO and TiO2/NiO heterojunctions. By using the valence band discontinuity values and corresponding energy bandgaps of the layers, energy band diagrams were developed. Judging from the band diagram, an appropriate solar cell consisting of p-type NiO and n-type ZnO layers was deposited on ITO, and a slight but noticeable photovoltaic effect was obtained with an open circuit voltage (Voc) of 0.96 V, short circuit current density (Jsc) of 2.2 μA/cm2, and fill factor of 0.44.

Original languageEnglish
Article number163108
JournalJournal of Applied Physics
Volume116
Issue number16
DOIs
Publication statusPublished - 2014 Oct 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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