Surface structure of phosphorus-terminated GaP(001)-(2x1)

Article

关键词: P-RICH;    SPECTROSCOPY;    PASSIVATION;    ADSORPTION;    INP(110);    GAP(100);    HYDROGEN;    LEED;    2X1;    STM;   

DOI  :  10.1103/PhysRevB.70.165323

来源: SCIE

【 摘 要 】

The surface structure of phosphorus-terminated GaP(001)-(2x1) has been studied by low-energy electron diffraction (LEED), high-resolution electron energy loss spectroscopy (HREELS), scanning tunneling microscopy (STM), and synchrotron radiation photoemission spectroscopy. HREELS spectra indicate that hydrogen is adsorbed on the surface, leading to formation of a P-H bond. The intensity of the stretching vibration of the P-H remains constant for the (2x1) surface annealed at 300-600 K, where (2x1) LEED patterns also remain. The vibration mode and patterns disappeared simultaneously upon annealing at 700 K. STM filled state images show zigzag chain structures. On the other hand, straight rows along the [110] direction are seen in the empty state images. Surface core-level shifts are found: +0.60 eV for Ga 3d and -0.69 and +0.39 eV for P 2p. These results can well explain a theoretical model of buckled P-dimers with hydrogen adsorbed in an alternating sequence.

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