Journal
NANO LETTERS
Volume 14, Issue 4, Pages 2000-2005Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl500081m
Keywords
pn-junction in a nanorod; scanning tunneling spectroscopy; mapping of band-edges across a pn-junction in a nanorod; density of states
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Funding
- Nano Mission projects
- CSIR Fellowship [09/080(0779)/2011-EMR-1, 510847, 9/080(0647)/2009-EMR-I, 507031]
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We map band-edges across a pn-junction that was formed in a nanorod. We form a single junction between p-type Cu2S and n-type CdS through a controlled cationic exchange process of CdS nanorods. We characterize nanorods of the individual materials and the single junction in a nanorod with an ultrahigh vacuum scanning tunneling microscope (UHV-STM) at 77 K. From scanning tunneling spectroscopy and correspondingly the density of states (DOS) spectra, we determine the conduction and valence band-edges at different points across the junction and the individual nanorods. We could map the band-diagram of nanorod-junctions to bring out the salient features of a diode, such as p- and n-sections, band-bending, depletion region, albeit interestingly in the nanoscale.
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