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Keywords:

  • 71.55.Eq;
  • 72.80.Ey;
  • 73.40.Gk;
  • 73.50.Pz;
  • 77.65.Ly;
  • 78.67.Pt

Abstract

We report on intersubband absorption and photovoltage measurements on regular GaN/AlN-based superlattice structures at 1.55 µm. For high barriers, the photovoltage peaks at a higher energy than the absorbance spectrum due to the decrease of the tunnelling probability. The observed photovoltage is thus the macroscopic manifestation that the 2-dimensional electron gas at the top of the superlattice gets depleted by a vertical transport of electrons. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)