Krustok, J.Raadik, T.Jaaniso, R.Kiisk, V.Sildos, I.Marandi, M.Komsa, H.-P.Li, B.Zhang, X.Gong, Y.Ajayan, P.M.2017-05-222017-05-222016Krustok, J., Raadik, T., Jaaniso, R., et al.. "Optical study of local strain related disordering in CVD-grown MoSe2ﾠmonolayers." <i>Applied Physics Letters,</i> 109, no. 25 (2016) AIP Publishing: http://dx.doi.org/10.1063/1.4972782.https://hdl.handle.net/1911/94319We present temperature dependent micro-photoluminescence and room temperature photoreflectance spectroscopy studies on aged MoSe2 monolayers with high surface roughness. A0 and B0 exciton bands were detected at 1.512 eV and 1.72 eV, respectively, which are 50–70 meV lower than those commonly reported for high-quality samples. It is shown that the difference can be accounted for using a model of localized excitons for disordered MoSe2monolayers where the optical band gap energy fluctuations could be caused by random distribution of local tensile strain due to surface roughness. The density of localized exciton states is found to follow the Lorentzian shape, where the peak of this distribution is about 70 meV from the energy of delocalized states.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1063/1.4972782