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Title: Surface excitons on a ZnO (000-1) thin film

Elementary excitations at the polar (000-1) surface of a 20 nm pseudomorphically grown ZnO thin film are examined by steady state and time-resolved photoluminescence spectroscopy at low temperature. We control the density of emission centers through the deposition of prototypical organic molecules with a carboxylic acid anchor group by the Langmuir-Blodgett technique. Knowledge of the precise film thickness, defect concentrations and number density of deposited molecules leads us to associate the surface exciton emission to defect-related localization centers that are generated through a photochemical process.
Authors:
; ;  [1] ; ; ;  [2]
  1. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Str. 2A, Berlin D-12489 (Germany)
  2. Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, Berlin D-12489 (Germany)
Publication Date:
OSTI Identifier:
22254104
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 19; Other Information: (c) 2013 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; EXCITONS; PHOTOCHEMISTRY; PHOTOLUMINESCENCE; SURFACES; THICKNESS; THIN FILMS; TIME RESOLUTION; ZINC OXIDES