You should drop the polymer first, and then start spinning. If the solution is too viscous than high speed
rotation is preferable. If the thickness at high speed is 100nm, you can repeat the spin coating at the
same speed several times, until you obtain the required thickness.
Just remember, film thickness decreases with the decrease of concentration and increase of spin-on
rotation. For example, to deposit 500 nm PMMA film you could use a solution with a concentration of
say 7% and rotation speed of 3000 rpm for 30 sec.
Tip: to measure the thickness of the film quickly: SPS-Europe offer the USB connectable FR-portable, a nice, portable, and affordable, in-situ thickness measurement tool.
POLOS spin coaters and spin processors are specially build in Germany for SPS-Europe. Our spinners meet the highest quality standards for the Semiconductor, Biotechnology, and Nanotechnology industries.