Abstract
The electrostatic potential distribution across single, isolated, colloidal heterostructured nanorods (NRs) with component materials expected to form a p-n junction within each NR has been measured using scanning Kelvin probe microscopy (SKPM). We compare CdS to bicomponent CdS-CdSe, CdS-PbSe, and CdS-PbS NRs prepared via different synthetic approaches to corroborate the SKPM assignments. The CdS-PbS NRs show a sharp contrast in measured potential across the material interface. We find the measured built-in potential within an individual NR to be attenuated by long-range electrostatic forces between the sample substrate, cantilever, and the measuring tip. Surface potential images were deconvoluted to yield built-in potentials ranging from 375 to 510 meV in the heterostructured NRs. We deduce the overall built-in potential as well as the charge distribution across each segment of the heterostructured NRs by combining SKPM data with simulations of the system.
Original language | American English |
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Pages (from-to) | 1278-1284 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 13 |
Issue number | 3 |
DOIs | |
State | Published - 2013 |
NREL Publication Number
- NREL/JA-5900-56714
Keywords
- built-in potential
- Charge transfer doping
- colloidal nanorods
- heterostructured nanomaterials
- scanning Kelvin probe microscopy