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Title: Electronic properties and morphology of Cu-phthalocyanine—C{sub 60} composite mixtures

Phthalocyanines in combination with C{sub 60} are benchmark materials for organic solar cells. Here, we have studied the morphology and electronic properties of co-deposited mixtures (blends) of these materials forming a bulk heterojunction as a function of the concentration of the two constituents. For a concentration of 1:1 of Cu-Phthalocyanine (CuPc):C{sub 60}, a phase separation into about 100 nm size domains is observed, which results in electronic properties similar to layered systems. For low C{sub 60} concentrations (10:1 CuPc:C{sub 60}), the morphology, as indicated by Low-Energy Electron Microscopy images, suggests a growth mode characterized by (amorphous) domains of CuPC, whereby the domain boundaries are decorated with C{sub 60}. Despite of these markedly different growth modes, the electronic properties of the heterojunction films are essentially unchanged.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [1] ;  [3]
  1. Center for Free-Electron Laser Science/DESY, Notkestraße 85, D-22607 Hamburg (Germany)
  2. Institute of Optics and Atomic Physics, TU Berlin, Straße des 17. Juni 135, D-10623 Berlin (Germany)
  3. (Germany)
  4. Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, D-10587 Berlin (Germany)
Publication Date:
OSTI Identifier:
22275779
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; 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; AMORPHOUS STATE; COMPOSITE MATERIALS; CONCENTRATION RATIO; COPPER COMPLEXES; COPPER COMPOUNDS; DOMAIN STRUCTURE; ELECTRON MICROSCOPY; FULLERENES; HETEROJUNCTIONS; MIXTURES; MORPHOLOGY; ORGANIC SOLAR CELLS; PHTHALOCYANINES; THIN FILMS