000152736 001__ 152736
000152736 005__ 20181203022022.0
000152736 0247_ $$2doi$$a10.1063/1.1433165
000152736 022__ $$a0003-6951
000152736 037__ $$aARTICLE
000152736 245__ $$aLarge size dependence of exciton-longitudinal-optical-phonon coupling in nitride-based quantum wells and quantum boxes
000152736 269__ $$a2002
000152736 260__ $$c2002
000152736 336__ $$aJournal Articles
000152736 520__ $$aWe present an experimental and theoretical study of the size dependence of the coupling between electron-hole pairs and longitudinal-optical phonons in Ga1-xInxN/GaN-based quantum wells and quantum boxes. We found that the Huang-Rhys factor S, which determines the distribution of luminescence intensities between the phonon replicas and the zero-phonon peak, increases significantly when the vertical size of the boxes or the thickness of quantum well increases. We assign this variation to (1) the strong electric field present along the growth axis of the system, due to spontaneous and piezoelectric polarizations in these wurtzite materials, and (2) the localization on separate sites of electrons and holes in the plane of the wells or boxes, due to potential fluctuations in the ternary alloy. Indeed, envelope-function calculations for free or localized excitons, with electron-hole distance only controlled by Coulomb interaction, do not account quantitatively for the measured behavior of the S factor. In fact, the latter is rather similar to what is obtained for donor-acceptor pairs, with a statistical distribution of distances between localization centers for electrons and holes. (C) 2002 American Institute of Physics.
000152736 6531_ $$aPHOTOLUMINESCENCE
000152736 6531_ $$aINGAN/GAN
000152736 6531_ $$aGAN
000152736 700__ $$aKalliakos, S.
000152736 700__ $$aZhang, X. B.
000152736 700__ $$aTaliercio, T.
000152736 700__ $$aLefebvre, P.
000152736 700__ $$aGil, B.
000152736 700__ $$0244550$$aGrandjean, N.$$g161577
000152736 700__ $$aDamilano, B.
000152736 700__ $$aMassies, J.
000152736 773__ $$j80$$k3$$q428-430$$tApplied Physics Letters
000152736 909C0 $$0252312$$pLASPE$$xU10946
000152736 909CO $$ooai:infoscience.tind.io:152736$$pSB$$particle
000152736 937__ $$aEPFL-ARTICLE-152736
000152736 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000152736 980__ $$aARTICLE