Kuan Eng J Goh et al 2008 Nanotechnology 19 445718 doi:10.1088/0957-4484/19/44/445718
Kuan Eng J Goh, A Bannani1 and C Troadec
Show affiliationsThe well-known Au/n-Si(111) Schottky interface is modified by a discontinuous pentacene film (~1.5 nm thick) and studied using spatially resolved ballistic electron emission spectroscopy (BEES). The pentacene film introduced subtle changes to the interface which cannot be definitively detected by current–voltage measurements or a standard BEES analysis of the barrier height. In contrast, analyzing the BEES results in a dual-parameter (transmission attenuation and barrier height) space allows the effect of the pentacene film on the Au/n-Si(111) interface to be clearly demonstrated. We found that the pentacene film behaves like a tunneling barrier and increases the distribution of local barrier heights with a tendency toward lower values. Our results highlight the potential of the dual-parameter BEES analysis for understanding local interface modification by molecules.
73.30.+y Surface double layers, Schottky barriers, and work functions
73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
Issue 44 (5 November 2008)
Received 21 June 2008, in final form 3 September 2008
Published 2 October 2008
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