Abstract
Ultrafast differential transmission spectroscopy was employed to study the carrier dynamics in InGaN/GaN multiple quantum wells with high inverted hexagonal pits density due to threading dislocation. By monitoring the temporal evolution of the excitonic absorption spectrum, a reduction of the quantum-confinement Stark shift was observed due to the photo-induced in-well field screening at low carrier densities and excitonic absorption quenching at high carrier densities. By comparing the differential absorption spectra at various injected carrier densities, the in-well field screening effect was distinguished from excitonic bleaching.
Original language | English |
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Pages (from-to) | 55-60 |
Number of pages | 6 |
Journal | MRS Communications |
Volume | 2 |
Issue number | 2 |
DOIs | |
Publication status | Published - 15 Jun 2012 |
Keywords
- quantum wells (QWs)
- quantum-confined stark effect (QCSE)