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Fullerene & pentacene flux-control data
Fullerene must first be thermally-annealed in vacuum in order to obtain a stable vapour pressure
1,2
. Figure 1 shows uncontrollable pressure fluctuations from as-supplied C
60,
measured with a quartz crystal microbalance (QCM).
Figure 2 shows stable flux-control QCM data following thermal annealing for twenty hours at 350ÂșC.
In contrast, as-supplied pentacene exhibits a stable vapour pressure, without recourse to pre-annealing (figure 3)
Figure 4 shows the linear flux change with valve position.
Figure 5 shows the fullerene beam profile at 150mm from a single-apertured ORG50V evaporator.
1 Pan, C. et al., J. Phys. Chem. 96, 6752, 1992
2 Popovic, A. et al., Rapid Comm. Mass Spec. 8, 985, 1994
Valved Organic evaporators ORG50V
Last updated: 23rd July 2010
Copyright 2008 The Vacutec Group
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