Abstract
The electronic structure and chemical reaction at the interface between 2,7-diocty[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) and La0.67Sr0.33MnO3 (LSMO) have been investigated using ultraviolet photoemission spectroscopy, X-ray photoemission spectroscopy, and atomic force microscopy. There is an interface dipole of 0.41 eV, pointing from LSMO to C8-BTBT. The Fermi level is 1.64 eV above the highest occupied molecular orbital (HOMO) of C8-BTBT and the injection of electron from LSMO to C8-BTBT is not efficient. The oxygen is found to diffuse from LSMO to C8-BTBT, which leads to the Mn4+ reduced into Mn3+ at the C8-BTBT/LSMO interface. The growth mode of C8-BTBT on LSMO film is Stranski-Krastanov(SK)mode. Our investigation suggest a buffer layer between the C8-BTBT and LSMO to bridge the electron transport barrier.
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