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MEH-PPV GIWAXS

MEH-PPV GIWAXS. (100). (100). ITO. ITO. cb06ls. cbhs2. MEH-PPV GIWAXS. (100). (100). ITO. ITO. tlls. tl06xhsw. (the ellipse may indicate a scattering feature due to the ordering of the alkyl side chains,

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MEH-PPV GIWAXS

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  1. MEH-PPV GIWAXS (100) (100) ITO ITO cb06ls cbhs2

  2. MEH-PPV GIWAXS (100) (100) ITO ITO tlls tl06xhsw (the ellipse may indicate a scattering feature due to the ordering of the alkyl side chains, however, I would like to look into this some more in the data from the annealed films

  3. Observations (Detlef Smilgies, CHESS) • all samples look quite similar: • only the MEH-PPV (100) reflection is visible: the film has very limited order • (001) is quite broad: only short-range order (use Scherrer formula) • (001) is preferentially aligned along the surface normal with a width of roughly 5 deg: • the polymer chains seem to want to be parallel to the substrate with the a stacking • of the aromatic rings perpendicular to the substrate. • for cb solvent there seems to be very little difference between ls and hs • for tl solvent films also look similar with respect to structure. It seems that the ls film • is quite a bit thicker than the hs film judging from the scattering intensity, however: • Remarks: • 1) These observations are only meaningful, if all data files were collected at the • minimum just past the MEH-PPV critical angle, and if the exposure times were equal ! • –> I assume this is the case, but I did not check. (The intensity of the ITO powder ring • is quite different in the two tl samples which indicates that exposures or incident angles • were different.) Please check the your log. • 2) Better information about thickness can be obtained from the XR data, if they are • good enough. • next step: • radial and angular distribution of the (100) peak, in order to compare samples • in detail; this is done using the fit2d CAKE feature with the special integration • option, when RADIAL BINS or ANGULAR bins is set to 1. • needed for this: distance calibration – I will work on this next, and will provide the • integrations as an example how to treat the other GIWAXS data

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