Experimental and theoretical studies of photosensitive semiconductor s
tructures as well as present-day semiconductor photoresistors and phot
odiodes based on polycrystalline and single-crystal materials, multila
yer structures, and superlattices for the spectral intervals from the
visible to the far-IR are described. The characteristics of multieleme
nt photodetectors based on lead chalcogenides, germanium and silicon,
III-V compounds, and CdHgTe are presented.