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Title: Morphological origin for the stratification of P3HT:PCBM blend film studied by neutron reflectometry

Understanding the origin for the film stratification of electron donor/acceptor blend is crucial for high efficiency organic photovoltaic cell. In this study, P3HT:PCBM blend is deposited onto hydrophilic and hydrophobic substrate to examine the film stratifications. The neutron reflectivity results show that, on the different surfaces, PCBM diffuses toward the two interfacial regions in an identical fashion during thermal annealing. This evidences that the film stratification is not affected by the substrates. Instead, since P3HT remains more amorphous in the interfacial regions and PCBM is miscible with amorphous P3HT, PCBM preferentially diffuses to the interfacial regions, resulting in the stratification.
Authors:
 [1] ;  [2] ; ;  [1] ; ; ;  [3]
  1. Neutron Science Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. (United States)
  3. Center for Nanophase Material Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22253962
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 22; 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; ANNEALING; BINDING ENERGY; DEPOSITS; ELECTRONS; FILMS; ORIGIN; PHOTOVOLTAIC CELLS; REFLECTIVITY; STRATIFICATION; SUBSTRATES