Evolution of the electronic structure of C60/La0.67Sr0.33MnO3 interface

The evolution of the electronic structure at the interface between fullerene (C60) and La0.67Sr0.33MnO3 (LSMO) has been investigated with ultraviolet photoemission spectroscopy and X-ray photoemission spectroscopy. There is a 0.61 eV barrier for the electrons to be injected from LSMO to C60. The ene...

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Veröffentlicht in:Applied physics letters 2016-01, Vol.108 (1)
Hauptverfasser: Xie, Haipeng, Niu, Dongmei, Lyu, Lu, Zhang, Hong, Zhang, Yuhe, Liu, Peng, Wang, Peng, Wu, Di, Gao, Yongli
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Sprache:eng
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Zusammenfassung:The evolution of the electronic structure at the interface between fullerene (C60) and La0.67Sr0.33MnO3 (LSMO) has been investigated with ultraviolet photoemission spectroscopy and X-ray photoemission spectroscopy. There is a 0.61 eV barrier for the electrons to be injected from LSMO to C60. The energy bands keep bending upward with increasing C60 thickness. A total energy bending of 0.72 eV is observed, changing the C60 film from n-type to p-type. The n-p transition is ascribed to the diffusion of oxygen from LSMO to C60 which subsequently strips electrons from C60, making the latter p-type. Our results suggest a buffer layer be inserted between the LSMO and C60 to lower the interface electron barrier and prevent deterioration of the C60 film in related spintronic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4939457