Positive and negative persistent photoconductivity in a two-side-doped (formula presented) quantum well
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
181
Journal Issue
2
Pages
13318-13321
Date Issued
1994
Author(s)
Abstract
We present detailed studies of the persistent photoconductivity effect in (Formula presented) quantum well, including wavelength, temperature, and time dependencies. We found conclusive results that show competition between the positive and negative persistent photoconductivity effects. We suggest that a complete understanding of the decay and buildup kinetics in the entire temperature region must incorporate both the positive and negative effects. We conclude that the major positive effect is due to the band-to-band electron-hole generation in the well layer followed by the spatial charge separation and the negative effect is related to the pumping of the two-dimensional electrons into the doped barrier layer followed by the decrease of mobility. © 1999 The American Physical Society.
Type
journal article