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Fullerene & pentacene flux-control data

Fullerene must first be thermally-annealed in vacuum in order to obtain a stable vapour pressure1,2. Figure 1 shows uncontrollable pressure fluctuations from as-supplied C60, 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