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Title: Electroabsorption and oppositely directed built-in fields in a photovoltaic organic heterostructure

The directions and intensities of local electric fields spontaneously built into organic nanoscale structures of Schottky-diode type, indium tin oxide (ITO)-CuPc-Al and ITO-C{sub 60}-Al, with donor and acceptor layers of copper phthalocyanine (CuPc) and fullerene (C{sub 60}) have been investigated using an improved spectral electroabsorption technique. It is established that, in the absence of external field and illumination, the built-in fields in the bulk of these structures are directed differently: from Al to ITO in the case of CuPc and from ITO to Al in the case of C{sub 6}0. The best studied photovoltaic heterostructure ITO-CuPc-C{sub 6}0-Al contains simultaneously strong built-in fields in CuPc and C{sub 60} layers, with strengths of about 15 and -22 V/{mu}m, respectively. A high (on the order of 10{sup -3} C/m{sup 2}) positive space charge arises at the donor-acceptor interface, and the oppositely directed fields may either increase or reduce the efficiency of light-energy converters, depending on the heterostructure parameters.
Authors:
; ;  [1]
  1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
Publication Date:
OSTI Identifier:
22210418
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 58; Journal Issue: 6; Other Information: Copyright (c) 2013 Pleiades Publishing, Inc.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COPPER COMPLEXES; EFFICIENCY; ELECTRIC FIELDS; FULLERENES; NANOSTRUCTURES; PHOTOVOLTAIC EFFECT; PHTHALOCYANINES; SCHOTTKY BARRIER DIODES; SPACE CHARGE; TIN OXIDES