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Title: Perovskite LaRhO{sub 3} as a p-type active layer in oxide photovoltaics

Perovskite-type transition-metal oxides have a wide variety of physical properties and triggered intensive research on functional devices in the form of heteroepitaxial junctions. However, there is a missing component that is a p-type conventional band semiconductor. LaRhO{sub 3} (LRO) is one of very few promising candidates having its bandgap between filled t{sub 2g} and empty e{sub g} of Rh in low-spin state, but there has been no report on the synthesis of large-size single crystals or thin films. Here, we report on the junction properties of single-crystalline thin films of LRO grown on (110) oriented Nb-doped SrTiO{sub 3} substrates. The external quantum efficiency of the photo-electron conversion exceeds 1% in the visible-light region due to the wide depletion layer and long diffusion length of minority carriers in LRO. Clear indication of p-type band semiconducting character in a perovskite oxide of LRO will pave a way to explore oxide electronics of perovskite heterostructures.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3]
  1. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198 (Japan)
  2. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656 (Japan)
  3. (QPEC), University of Tokyo, Tokyo 113-8656 (Japan)
Publication Date:
OSTI Identifier:
22412654
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 7; Other Information: (c) 2015 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; CHARGE CARRIERS; DEPLETION LAYER; DIFFUSION LENGTH; DOPED MATERIALS; ELECTRIC CONTACTS; ELECTRONS; LANTHANUM COMPOUNDS; MONOCRYSTALS; PEROVSKITE; PHOTOVOLTAIC EFFECT; QUANTUM EFFICIENCY; RHODIUM OXIDES; SEMICONDUCTOR JUNCTIONS; SEMICONDUCTOR MATERIALS; SPIN; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; VISIBLE RADIATION