DIMENSIONAL QUANTIZATION IN ALPHA-SI-H QUANTUM-WELL STRUCTURES - THE ALLOY MODEL

The effect of dimensional quantization on the density of states in amorphous semiconductors is studied theoretically. The disorder is treated as a random potential with zero correlation length (eewhite noiseee). The transition of the density of states from staircase to smooth behavior with increasing disorder is traced for high-energy electrons and it was found to occur at substantially smaller film thicknesses than in experimental data. The possibility of resolving this contradiction in other models of disorder is discussed. © 1990 The American Physical Society.