The effect of cesium carbonate on 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 aggregation in films

Lindemann, William R.; Wang, Wenjie; Fungura, Fadzai; Shinar, Joseph; Shinar, Ruth; Vaknin, David

doi:10.1063/1.4901444

Title: The effect of cesium carbonate on 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C₆₁ aggregation in films

Journal Article · Tue Nov 11 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4901444· OSTI ID:1225527

Lindemann, William R. ^[1]; Wang, Wenjie ^[1]; Fungura, Fadzai ^[2]; Shinar, Joseph ^[1]; Shinar, Ruth ^[2]; Vaknin, David ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)

Surface-pressure 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]C₆₁ (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 photovoltaics and the likely ensuing ionic Cs-PCBM interaction decrease aggregation tendency of PCBM. As a result, this implies that the use of cesium salts affects the morphology of the organic layer and consequently improves the efficiency of these devices.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1225527

Report Number(s):: IS-J-8538; APPLAB; PII: S0003267015013148

Journal Information:: Applied Physics Letters, Vol. 105, Issue 19; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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