The results for optical, electrical, and structural parameters of undo
ped a-Si:H films deposited at T-s=200-400 degrees C are presented. The
reactor type (diode or triode), SiH4 content in the gas mixture, and
the gases (Ar, He, and H-2) were varied. Prepared at T-s=400 degrees C
and under optimization of other conditions, the a-Si:H films is chara
cterized as a device-quality material with a low hydrogen content (dow
n to 3 at. %). (C) 1996 American Institute of Physics.