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We analyze the lineshape of the quasiparticle photoluminescence of monolayer (ML) and bilayer (BL) molybdenum ditelluride in temperature- and excitation intensity-dependent experiments. We confirm the existence of a negatively charged trion in the BL based on its emission characteristics and find hints for a coexistence of intra- and interlayer trions with a few meV splitting in energy. From the lineshape analysis of exciton and trion emission we extract values for exciton and trion deformation potentials as well as acoustical and optical phonon-limited mobilities in MoTe2. We estimate an acoustical phonon limited mobility of 6000 and 4300 cm2 Vs−1 for the exciton at low temperature for ML and BL, respectively, which corresponds to an electron mobility of 105 cm2 Vs−1. At higher temperatures, the optical phonons limit the mobility to 1100 and 250 cm2 Vs−1 for ML and BL.

High phonon-limited mobility of charged and neutral excitons in mono- and bilayerMoTe2

High phonon-limited mobility of charged and neutral excitons in mono- and bilayerMoTe₂