Hydrogen diffusion behavior in CH4N-molecularion-implanted wafers for three-dimensional stacked CMOS image sensors

Abstract

In this study, the diffusion behavior of hydrogen in a CH4N-molecular-ion-implanted epitaxial wafer was investegated by reaction kinetic analysis. Two hydrogen-trapping sites, carbon aggregate and end of range (EOR) defects, were formed in the CH4N-implanted region. The C-H2 binding state was formed in the carbon aggregate region. On the other hand, the N-H binding state was formed in the EOR defect region. This result indicates that CH4N-molecular-ion-implanted epitaxial wafers contribute to the reduction in Dit at the SiO2/Si interface due to hydrogen desorption from the CH4N-implanted region during heat treatment in the device process.