1/f Tunnel Current Noise through Si-bound Alkyl Monolayers
Nicolas Clement, Stephane Pleutin, Oliver Seitz, Stephane Lenfant, Dominique Vuillaume
Abstract
We report low frequency tunnel current noise characteristics of an organic monolayer tunnel junction. The measured devices, n-Si/alkyl chain (C18H37)/Al junctions, exhibit a clear 1/ f γ power spectrum noise with 1< γ <1.2. We observe a slight bias-dependent background of the normalized current noise power spectrum (SI/I2). However, a local increase is also observed over a certain bias range, mainly if V > 0.4 V, with an amplitude varying from device to device. We attribute this effect to an energy-dependent trap-induced tunnel current. We find that the background noise, SI, scales with >. A model is proposed showing qualitative agreements with our experimental data.
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