The molecularly controlled semiconductor resistor: How does it work?

Eyal Capua, Amir Natan, Leeor Kronik, Ron Naaman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We examine the current response of molecularly controlled semiconductor devices to the presence of weakly interacting analytes. We evaluate the response of two types of devices, a silicon oxide coated silicon device and a GaAs/AlGaAs device, both coated with aliphatic chains and exposed to the same set of analytes. By comparing the device electrical response with contact potential difference and surface photovoltage measurements, we show that there are two mechanisms that may affect the underlying substrate, namely, formation of layers with a net dipolar moment and molecular interaction with surface states. We find that whereas the Si device response is mostly correlated to the analyte dipole, the GaAs device response is mostly correlated to interactions with surface states. Existence of a silicon oxide layer, whether native on the Si or deliberately grown on the GaAs, eliminates analyte interaction with the surface states.

Original languageEnglish
Pages (from-to)2679-2683
Number of pages5
JournalACS Applied Materials and Interfaces
Issue number11
StatePublished - 25 Nov 2009
Externally publishedYes


  • band bending
  • dipole layer
  • molecularly controlled resistor
  • monolayer
  • surface states


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