Full text loading...
(Color online) (a) AFM and EFM images of a single CdSe/CdTe hetero-NW, (b) without illumination, and (c) at 12 μW excitation power at the position indicated by a white circle. The diameter of the white circles represents the width of the laser spot. #1 and #2 in (a) label the acquisition position of the Raman spectra shown in Fig. 2(b). Bright features in the EFM image correspond to a negative charge.
(Color online) (a) AFM topography and EFM charge profiles for different excitation powers along the axis of the NW shown in Fig. 1. The vertical dashed line marks the interface of the two segments. (b) Raman spectra taken at the positions labeled in Fig. 1(a). The solid lines are Lorentzian fits to the data points. Curve #2 is offset for clarity. (c) Alignment of the conduction band (CB) and valence band (VB) along the axis of a hetero-NW. (d) Integrated EFM charge signal in the negatively (filled squares) and in the positively charged segment (open circles).
(Color online) EFM images taken (a) while illuminating the CdSe segment (indicated by the white circle) and (b) without illumination. (c) EFM charge profiles of the images shown in (a) and (b) along the NW axis.
Article metrics loading...