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Normalized photocurrent gain for both samples I and II under optical excitation in the wells and barriers .
characteristics as a function of temperature for sample I (sample II) (a) [(c)] in dark and (b) [(d)] under optical excitation at . Temperature ranges from 250 down to in steps of . The arrow shows the direction of current growth as increases for forward and reverse biases. The dashed arrows show this variation below at reverse bias.
Photoconductance and photocapacitance as a function of voltage for optical excitation in the wells and barriers at room temperature and . The inset shows the photoconductance and photocapacitance at .
Schematic representation of a generic conduction band (CB) for photoinduced screening. The electron (in the CB) and hole (in the valence band) accumulation at the boundaries of the electric field domains is explicitly indicated.
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