Abstract
We demonstrate a dramatic reduction of the oscillator strength in quantum wells due to piezoelectric fields. Our study using time-resolved photoluminescence spectroscopy reveals a strong increase of the luminescence decay time of the dominating transition with increasing well width by several orders of magnitude in parallel to a redshift of the emission peaks. The experimental results are consistently explained by a quantitative model based on the piezoelectric fields in strained wurtzite quantum wells. We estimate the piezoelectric constant of GaN to cm/V.
- Received 15 December 1997
DOI:https://doi.org/10.1103/PhysRevB.57.R9435
©1998 American Physical Society