The formation of epitaxial lead-telluride films on a silicon substrate
with a porous-silicon sublayer is investigated. In these structures v
ertical-type infrared photodiodes were produced using ion doping. Desp
ite a great mismatch in the lattice constants and the temperature expa
nsion coefficients between silicon and lead telluride, the photodiode
parameters are similar to those of photodiodes in the orienting substr
ates. (C) 1997 American institute of Physics.