6533b832fe1ef96bd129a289

RESEARCH PRODUCT

Monte Carlo simulation approach for a quantitative characterization of the band edge in InGaN quantum wells

Saulius JuršėnasYung-chen ChengChih-chung YangG. TamulatisChi-feng HuangArtūras ŽUkauskasKarolis KazlauskasM. SpringisHsiang-chen Wang

subject

Condensed Matter::Materials ScienceLaser linewidthPhotoluminescencechemistryCondensed matter physicsExcitonMonte Carlo methodchemistry.chemical_elementPhotoluminescence excitationEdge (geometry)IndiumQuantum well

description

Monte Carlo simulation approach based on exciton hopping through randomly distributed localized states is proposed for quantitative characterization of the band edge of InxGa1–xN/GaN multiple quantum wells with different indium content (x ≈ 0.22–0.27). The band edge dynamics is investigated in the 10–300 K range by analyzing the measured S- and W-shaped temperature behavior of the photoluminescence peak position and linewidth, respectively. The simulation of the W-shaped temperature dependence using double-scaled potential profile model enabled us to estimate the scale of the potential fluctuations due to variation of indium content inside and among In-rich regions formed in InGaN alloy. Increased indium content in InGaN alloy resulted in an increase of the both scales of the potential fluctuations. Moreover, the temperature dependence of the exciton energy was reconstructed and compared with that obtained from the photoreflectance measurements. The density of localized states used in the simulations was in agreement with the photoluminescence excitation data. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

yearjournalcountryeditionlanguage
2005-02-01physica status solidi (c)
https://doi.org/10.1002/pssc.200460613