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Title: The effect of cesium carbonate on 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C{sub 61} aggregation in films

Surface-pressure versus molecular area isotherms, X-ray reflectivity, and X-ray near-total reflection fluorescence were used to study the properties of 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C{sub 61} (PCBM) that was pre-mixed with cesium carbonate and spread as a film at the air-water interface. The pre-mixed PCBM with cesium carbonate demonstrated a strikingly strong effect on the organization of the film. Whereas films formed from pure PCBM solution were rough due to strong inter-molecular interactions, the films formed from the mixture were much smoother. This indicates that the cesium carbonate moderates the inter-molecular interactions among PCBM molecules, hinting that the cesium diffusion observed in inverted organic photovoltaic structures and the likely ensuing ionic Cs-PCBM interaction decrease aggregation tendency of PCBM. This implies that the use of cesium salts affects the morphology of the organic layer and consequently improves the efficiency of these devices.
Authors:
; ; ;  [1] ; ;  [2]
  1. Ames Laboratory and the Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
  2. The Microelectronics Research Center and the Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States)
Publication Date:
OSTI Identifier:
22391937
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AGGLOMERATION; CESIUM; CESIUM CARBONATES; EFFICIENCY; FILMS; FLUORESCENCE; FULLERENES; ISOTHERMS; LAYERS; MATHEMATICAL SOLUTIONS; MOLECULES; MORPHOLOGY; ORGANIC SOLAR CELLS; REFLECTIVITY; X RADIATION