As far as I know "Biotechnology" is not a clearly defined field. You will most likely find yourself studying Electrical Engineering, Microbiology, Bio or Chemical Engineering, Medicine, Materials Science, etc. etc.
It is similar to Robotics in that sense. Typically research is done by interdisciplinary teams rather than a jack-of-all-trades single person.
I went to school for Electrical Engineering and I'm working on biotechnology.