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THEORY OF ELECTRONS IN A NONCRYSTALLINE
PHONONS AND POLARONS
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a.c. conductivity activation energy alloys amorphous arsenic amorphous germanium amorphous semiconductors Anderson localization Anderson transition annealing atoms band edge band gap behaviour calculated carriers centres chalcogen chalcogenides Chapter charged conduction band crystal crystalline dangling bonds deduced defect density deposited discussed disorder donors doped drift mobility e.s.r. signal electric field electron evaporated films excitation exciton expected experimental exponential Fermi energy Fermi level frequency function germanium glasses glow-discharge-deposited holes impurity conduction increases lattice liquid low temperatures luminescence mean free path measurements mobility edge Mott n-type N(EF observed obtained occurs optical absorption edge overlap oxygen pair peak phonons photoconductivity photoluminescence photon energy plotted polaron potential pseudogap random range recombination samples scattering selenium shown in Fig shows slope solid Spear spectra spectrum spin sputtered films Stokes shift structure tail temperature dependence theory thermal thermopower trapped valence band variable-range hopping voids wavefunctions zero