I-V curves of n-p and p-n nanowires. (a) n-p Nanowires (n-doped at the top and p-doped at the bottom) and (b) p-n nanowires (p-doped at the top and n-doped at the bottom). Reprinted with permission from Hoffmann et al. .
Li et al. Nanoscale Research Letters 2013 8:175 doi:10.1186/1556-276X-8-175