6533b7d3fe1ef96bd125fe20

RESEARCH PRODUCT

Carrier localization effect in polarized InGaN multiple quantum wells

G. KurilčikChih-chung YangKarolis KazlauskasChi-feng HuangSaulius MiasojedovasYung-chen ChengM. SpringisSaulius JuršėnasJūras MickevičiusHsiang-chen WangI. TaleArtūras ŽUkauskasGintautas Tamulaitis

subject

PhysicsPhotoluminescenceCondensed matter physicsExcitonMultiple quantumMonte Carlo methodField effectField strengthMolecular physicsExcitationRecombination

description

Carrier localization effects in polarized InGaN/GaN multiple quantum wells (MQWs) were investigated as a function of well width, d, and In content, x. Using photoreflectance (PR), photoluminescence (PL), PL excitation (PLE), selective excitation of PL, PL excitation power, and time-resolved PL spectroscopy, the dominance of the localization effect against the built-in field effect on carrier recombination dynamics in InxGa1–xN MQWs of different well width (d = 2.0–4.0 nm, x ≈ 0.15) and In content (x ≈ 0.22–0.27, d = 2.5 nm) was revealed. Based on the modeling of the PL spectra by Monte Carlo simulation of exciton hopping and the spectroscopic reference provided by PR, increased In content and well width were found to increase the band potential fluctuations and carrier localization depth. The density of localized states deduced from the simulation was found to be in a fair agreement with the PLE data. The built-in field strength in InGaN QWs containing 15% of In was estimated to be of 0.5 MV/cm. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

yearjournalcountryeditionlanguage
2005-04-11physica status solidi (c)
https://doi.org/10.1002/pssc.200461428