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The effect of cesium carbonate on 1-(3-methoxycarbonyl)propyl-1-phenyl 6,6 C-61 aggregation in films

TitleThe effect of cesium carbonate on 1-(3-methoxycarbonyl)propyl-1-phenyl 6,6 C-61 aggregation in films
Publication TypeJournal Article
Year of Publication2014
AuthorsLindemann, WR, Wang, WJ, Fungura, F, Shinar, J, Shinar, R, Vaknin, D
JournalApplied Physics Letters
Volume105
Pagination191605
Date Published11
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000345216100024
Keywordsc-60-propylamine adduct monolayers, cathode, efficiency, heterojunction solar-cells, interfacial layer, neutron, organic photovoltaics, polymer, short-circuit current, x-ray
Abstract

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-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. (C) 2014 AIP Publishing LLC.

DOI10.1063/1.4901444
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Photonics