Figure 1
From: A p-i-n junction diode based on locally doped carbon nanotube network
Assembled random network of carbon nanotubes and their optical absorption characteristics before and after doping.
(a) A scanning electron microscope (SEM, Model Zeiss Ultra 55) image of assembled random network of carbon nanotubes. (b) UV-Vis-NIR spectra of pristine, OA-doped and PEI-doped SWNT network. (c) Schematic diagram showing the doping process of OA and PEI to SWNTs, respectively. OA forms a charge-transfer complex with the SWNTs, injecting holes into the SWNT network. Electrons from amine groups are donated to the SWNT network when PEI winds around the carbon nanotube.
