16 September 2011 Scanning photocurrent microscopy in single nanowire devices
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Scanning photocurrent microscopy (SPCM) is a powerful technique for investigating local electronic structures and charge transport in semiconductor nanowires. Here we apply this technique to explore colloidal PbSe nanowires and VO2 nanobeams. Field effect transistors incorporating single colloidal PbSe nanowires were fabricated. A fast, sensitive polarization-dependent photoresponse was observed. SPCM of as-grown PbSe nanowires showed a downward band bending towards the metal electrodes, consistent with their p-type nature. At 54 °C, SPCM of VO2 nanobeams revealed band bending at the metallic/insulating domain boundaries. At room temperature, we observed photocurrent spots in the middle of the VO2 nanobeams, indicating local electric fields likely caused by defects.
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Rion Graham, Rion Graham, Chris Miller, Chris Miller, Mark Triplett, Mark Triplett, Dong Yu, Dong Yu, } "Scanning photocurrent microscopy in single nanowire devices", Proc. SPIE 8106, Nanoepitaxy: Materials and Devices III, 81060K (16 September 2011); doi: 10.1117/12.899410; https://doi.org/10.1117/12.899410

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