Ice and a slice makes transistors more precise

 作者:麦谡襞     |      日期:2019-03-07 01:11:01
WINTER is just beginning in the northern hemisphere, but pieces of equipment at Harvard University are already covered in ice. It seems the clear solid can be used as a mask to build transistors more precisely. Daniel Branton and his colleagues placed carbon nanotubes onto a silicon wafer, cooled it to about -163 °C and sprayed it with water, causing an 80-nanometre-thick layer of ice to form. Then the researchers used an electron beam to carve away two squares of ice, exposing the tops of some nanotubes,