Abstract
Low-energy electron transmission (LEET) experiments were performed for the indium/perylene-3,4,9,10-tetracarboxylic dianhydride (In/PTCDA) system prepared by a sequential deposition of PTCDA and In on a MoS2 single crystal surface. The dependence of LEET spectra and the work function change (Δφ=φfilm-φsubstrate) on the deposition amount of In on the PTCDA monolayer showed that the organic-metal compound of In4PTCDA was formed at the In/PTCDA interface. The result is in good agreement with that previously obtained using metastable atom electron spectroscopy. Furthermore, from the temperature dependence of LEET spectra and Δφ for the In/PTCDA system, we propose that in the as-grown In4PTCDA at room temperature In atoms are located out of the PTCDA plane, and after heat treatment, it becomes a planer structure.
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