Nano Letters · 2008 · 59 citations · 19 references
EngineeringElectrical EngineeringMaterials ScienceOptoelectronicsSemiconductor DevicesSemiconductor MaterialsCarrier TransportNanotubesOptoelectronic DevicesOptoelectronic MaterialsSemiconductor HeterostructuresSemiconductor PhysicsCarrier Transport In SemiconductorsElectron Transport In SemiconductorsHeterojunctionsOhmic ConductionOhmic ContactsSemiconductor HeterojunctionsSemiconductor JunctionsTransport In Semiconductors
Heterojunctions consisting of nanotubes and an industrialized semiconductor-GaAs have been produced, and their transport properties were studied. We found that the p-doped GaAs forms an ohmic contact with a nanotube but the n-doped GaAs/nanotube heterojunction is rectifying. Analysis of measurement results at various temperatures shows that tunneling transport plays an important role. We also observed photovoltaic effects in n-GaAs/nanotube junction with the illumination of a green laser or desk lamp.
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