大马士革铜互连线织构的研究

采用EBSD研究了不同线宽和退火前后Cu互连线的织构和晶界特征分布.Cu互连线均具有多重织构,其中(111)织构强度最高.沉积态样品在室温下发生了自退火现象,并出现了一些异常长大的晶粒.随高宽比降低和退火处理,Cu互连线晶粒尺寸变大,(111)织构得到加强,而具有较低应变程度的织构与(111)织构强度的比例下降.沉积态样品出现了(111)<112>和(111)<231>织构组分.退火后,出现了(111)<110>组分,而且(111)<112>和(111)<231>组分得到增强.Cu互连线以大角度晶界为主,其中具有55°～60°错配角的晶界和∑3晶界比例最高,35°～40°的错配角和∑9晶界次之.随高宽比增加和退火处理,∑3晶界比例逐渐升高,∑9晶界比例下降.

Texture Analysis of Damascene Copper Interconnects

Texture and grain boundary character distribution of Cu interconnects with different line width for as-deposited and annealed conditions were measured by EBSD. All specimens appear mixed texture and (111) texture is the dominate component. As-deposited interconnects undergo the phenomenon of self-annealing at RT,in which some abnormally large grains are found. Lower aspect ratio of lines and anneal treatment procured larger grains and stronger (111) texture.Meanwhile, the intensity proportion of other textures with lower strain energy to (111) texture is decreased. As-deposited specimens reveal (111) <112> and (111) <231> components. (111) <110> component appeared and (111) <112> and (111)<231> components were developed during the annealing process. High angle boundaries are dominant in all specimens,boundaries with a misorientation of 55°～60° and ∑3 ones in higher proportion, followed by lower boundaries with a mi-sorientation of 35°～ 40° and ∑9 boundaries. As the aspect ratio of lines and anneal treatment increase, there is a gradual in-crement in ∑3 boundaries and a decrease in ∑9 boundaries.