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New dG
Measurement
Methods Reveal
Nanodevice
Characteristics
Faster, at Lower Cost
Jennifer Makupson
Keithley Instruments, Inc.

Ohm's Law May Not Be Relevant                         importantmeasurementsmadeonnanoscale            Since differential conductance (dI/dV)
 The demand for smaller, lower power                  devices,butitpresentsauniquesetofchal-         is directly proportional to the density of
electronic devices is fueling nanotechnol-            lenges.Fortunately,newmeasurementtech-         states, it is the most direct measurement of
ogy development. Researchers are striving             niques are making this type of study much      this phenomenon. Such measurements can
to understand the quantum level structure             easier.                                        identifyconditionsunderwhichconductance
andbehaviorofnanoscaledevicesandhow                                                                  reaches a maximum, i.e., the electron ener-
theseaffectelectricalproperties.Thismakes             Applications for Differential                  gies(eV)wherenanoscalematerialelectrons
itpossible,forexample,toobserveorpredict              Conductance Measurements                       arethemostactive.Thisallowsresearchers
when tunneling occurs, calculate a device's            Differential conductance measurements         tocharacterizethenumberofenergyoptions
densityofstates,understandconductionphe-              areperformedinmanyapplicationsbutmay           availabletoanelectronasitfallsintoalower
nomenon in cryogenic environments, and                haveanumberofaliases.Theseinclude:             energylevelbygivingupenergyorasitas-
create artificial atoms in which energy quan-         

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