A quantitative study of PCBM diffusion during annealing of P3HT: PCBM blend films

Title: A quantitative study of PCBM diffusion during annealing of P3HT: PCBM blend films
Creator: Watts, Benjamin; Belcher, Warwick J.; Thomsen, Lars; Ade, Harald; Dastoor, Paul C.
Relation: Macromolecules Vol. 42, Issue 21, p. 8392-8397
Publisher Link: http://dx.doi.org/10.1021/ma901444u
Publisher: American Chemical Society
Resource Type: journal article
Date: 2009
Description: Scanning transmission X-ray microscopy has been used to quantitatively map the composition of P3HT:PCBM blend films in the vicinity of PCBM crystals formed during annealing at 140°C. The observed PCBM concentration profiles around these crystals have been fitted to Fick’s second law of diffusion and the diffusion constant found to be 2.5 x 10⁻¹⁴ m² s⁻¹. The PCBM concentration at the crystal boundary was found to be 19% (v/v) and is interpreted, together with the annealing temperature of 140°C, as a point on the bimodal line of the composition-temperature phase diagram. The diffusion ofPCBM through P3HT is observed to be bulk-dominated, in contrast to the surface/interface-dominated diffusion observed in MDMO-PPV:PCBM blend films by Yang et al.
Subject: PCBM; P3HT; blend films; polymer solar cells; diffusion
Identifier: http://hdl.handle.net/1959.13/916234
Identifier: uon:7933
Identifier: ISSN:8392-8397
Language: eng
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