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Characterization of coumarin-6 Polycrystalline Films Growth From Vacuum Deposition at Various Substrate Temperatures

Characterization of coumarin-6 Polycrystalline Films Growth From Vacuum Deposition at Various Substrate Temperatures

Ko-Lun Chen, Hui-Ting Liu, Jang-Hung Yu, Yung-Hsiang Tung, Yun-Syuan Chou, Chun-Chuen Yang, Jyh-Shyang Wang, Ji-Lin Shen, Kuan-Cheng Chiu

Sci Rep. 2018 Nov 13;8(1):16740.

PMID: 30425267

Abstract:

Coumarin-6 polycrystalline films were fabricated from vacuum deposition at various substrate temperatures Tsub from 106 to 178 °C with a fixed source temperature of 185 °C. Because of its slenderer and more asymmetric structure, the adhered coumarin-6 molecule on top of the growing interface encounters a larger steric energetic barrier of 0.92 eV as estimated from the Arrhenius plot of growth rate versus 1/Tsub. From top-view SEM pictures, the as-deposited coumarin-6 thin films exhibit a twisted pattern and a kinematic roughness for Tsub < 150 °C; while clear facets emerge for Tsub ≥ 150 °C due to the increase of surface diffusion energy of the adhered molecules. From XRD analysis, besides the confirmation of the triclinic structure two anomalous peaks observed at 2θ ~ 9.007° and 7.260° are explained due to the co-existence of N- and S-coumarin-6-isomers within the crystalline grains. Furthermore, for coumarin-6 polycrystalline films deposited at Tsub = 150 °C with high crystallinity of the constituent grains, the bandgap determined from optical transmission is around 2.392 eV; and from photoluminescence spectra, the fitted four emission components are assigned to the Frenkel and charge transfer excitons recombination with participation of molecular vibrational states.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP38215360	Coumarin 6		38215-36-0	Price

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