Assertion: semiconductor's impurity | /r/HasProperty | na+ ions
Facets:
Source sentences:
text: To observe quantum effects at the Si/SiO 2 interface, two basic conditions must be met: (1) the SiO 2 insulator, of amorphous nature, should neither have high concentration of impurities (Na+ ions) nor trapped charge and (2) the smoothness of the Si/SiO 2 interface should be controlled at the atomic size level, because a rough surface on top of the inversion channel would greatly decrease the electron mobility in the inversion layer.