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Title: Efficient charge transfer and field-induced tunneling transport in hybrid composite device of organic semiconductor and cadmium telluride quantum dots

Temperature and photo-dependent current–voltage characteristics are investigated in thin film devices of a hybrid-composite comprising of organic semiconductor poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) and cadmium telluride quantum dots (CdTe QDs). A detailed study of the charge injection mechanism in ITO/PEDOT:PSS-CdTe QDs/Al device exhibits a transition from direct tunneling to Fowler–Nordheim tunneling with increasing electric field due to formation of high barrier at the QD interface. In addition, the hybrid-composite exhibits a huge photoluminescence quenching compared to aboriginal CdTe QDs and high increment in photoconductivity (∼ 400%), which is attributed to the charge transfer phenomena. The effective barrier height (Φ{sub B} ≈ 0.68 eV) is estimated from the transition voltage and the possible origin of its variation with temperature and photo-illumination is discussed.
Authors:
; ; ; ;  [1] ;  [2]
  1. Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
  2. Department of Physics, Gitam University, Hyderabad 502329 (India)
Publication Date:
OSTI Identifier:
22412898
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM; CADMIUM TELLURIDES; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ILLUMINANCE; INTERFACES; ORGANIC SEMICONDUCTORS; PHOTOCONDUCTIVITY; PHOTOLUMINESCENCE; QUANTUM DOTS; TEMPERATURE DEPENDENCE; THIN FILMS; TUNNEL EFFECT