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Kelvin probe microscopic visualization of charge storage at polystyrene interfaces with pentacene and gold
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15.See supplementary material at http://dx.doi.org/10.1063/1.3684977 for the plot of offset surface potential, plots of the surface potentials of gold/PS samples, and the output curves for lateral transistors before and after charging. [Supplementary Material]
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Figures

Image of FIG. 1.

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FIG. 1.

(Color online) (a) The schematic of the sample heterojunction, with the KPM scan line in red. (b) The uncharged sample surface potential at various applied biases. The sample was initially scanned in the negative direction to −10 V then the bias was stepped up to +9 V and finally back to 0 V. (c) The sample was removed from the KPM and charged at +200 V for 10 min, then returned to the KPM and rescanned.

Image of FIG. 2.

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FIG. 2.

(Color online) The difference in surface potential between PS and gold 5 μm from either end of the KPM scan; the five data points nearest to the 5 μm location were averaged and the difference between the pair of averages for each scan was taken for every incremental bias applied. The 5 μm location was selected as the position where plots such as those of Figure 1 were fully level. Center, uncharged; upper, +100 V; lower, −100 V.

Image of FIG. 3.

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FIG. 3.

(Color online) Thermally stimulated discharge current for the two PS samples. The glass transition temperature for PS is ∼100 °C.

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/content/aip/journal/apl/100/7/10.1063/1.3684977
2012-02-14
2014-04-16

Abstract

Charge carriers trapped in polystyrene (PS) were investigated with Kelvin probe microscopy (KPM) and thermally stimulated discharge current (TSDC). Lateral heterojunctions of pentacene/PS were scanned using KPM, effectively observing polarization along a side view of a lateral nonvolatile organic field-effect transistordielectric interface. TSDC was used to observe charge migration out of PS films and to estimate the trap energy level inside the PS, using the initial rise method.

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Scitation: Kelvin probe microscopic visualization of charge storage at polystyrene interfaces with pentacene and gold
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/7/10.1063/1.3684977
10.1063/1.3684977
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