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

The energy band diagrams of NiO-based solar cell structures that use various n-type oxide semiconductors such as ZnO, Mg{sub 0.3}Zn{sub 0.7}O, Zn{sub 0.5}Sn{sub 0.5}O, In{sub 2}O{sub 3}:Sn (ITO), SnO{sub 2}, and TiO{sub 2} were evaluated by photoelectron yield spectroscopy. The valence band discontinuities were estimated to be 1.6 eV for ZnO/NiO and Mg{sub 0.3}Zn{sub 0.7}O/NiO, 1.7 eV for Zn{sub 0.5}Sn{sub 0.5}O/NiO and ITO/NiO, and 1.8 eV for SnO{sub 2}/NiO and TiO{sub 2}/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 (V{sub oc}) of 0.96 V, short circuit current density (J{sub sc}) of 2.2 μA/cm{sup 2}, and fill factor of 0.44.
Authors:
;  [1] ;  [2]
  1. Faculty of Science and Technology/Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510 (Japan)
  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980–8577 (Japan)
Publication Date:
OSTI Identifier:
22308133
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CURRENT DENSITY; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; ELECTRONIC STRUCTURE; EV RANGE; FILL FACTORS; HETEROJUNCTIONS; INDIUM OXIDES; LAYERS; NICKEL OXIDES; PHOTOVOLTAIC EFFECT; SEMICONDUCTOR MATERIALS; SOLAR CELLS; SPECTROSCOPY; THIN FILMS; TIN OXIDES; TITANIUM ADDITIONS; TITANIUM OXIDES; ZINC OXIDES