RT Journal Article T1 Scanning tunneling spectroscopy study of erbium doped GaSb crystals A1 Hidalgo Alcalde, Pedro A1 Méndez Martín, Bianchi A1 Piqueras de Noriega, Javier A1 Plaza, J. L. A1 Dieguez, E. AB Er doped GaSb single crystals have been studied by scanning tunneling spectroscopy (STS) and cathodoluminescence (CL) in a combined scanning electron microscope-scanning tunnelling microscope system. The surface band gap in doped samples has been found to be about 0.5 eV while in undoped crystals the gap is close to the bulk value. Inhomogeneities in the local electronic properties of the doped crystals are studied by a correlation of the CL images and STS data. PB American Institute of Physics SN 0021-8979 YR 1999 FD 1999-08-01 LK https://hdl.handle.net/20.500.14352/58942 UL https://hdl.handle.net/20.500.14352/58942 LA eng NO 1 X. Zhao, K. Hirakawa, and T. Ikoma, Appl. Phys. Lett. 54, 712 (1989).2 H. Isshiki, H. Kobayashi, S. Yugo, and T. Kimura, Appl. Phys. Lett. 58, 484 (1991).3 A. J. Neuhalfen and B. W. Wessels, Appl. Phys. Lett. 59, 2317 (1991).4 M. Thaik, U. Hömmerich, R. N. Schwartz, R. G. Wilson, and J. M. Zavada, Appl. Phys. Lett. 71, 2641 (1997).5 S. Kim, S. J. Rhee, D. A. Turnbull, X. Li, J. J. Coleman, S. G. Bishop, and P. B. Klein, Appl. Phys. Lett. 71, 2662 (1997).6 Y. Sun and M. Wu, J. Appl. Phys. 78, 6691 (1995).7 Y. Sun, M. Wu, and Y. Ting, J. Cryst. Growth 85, 449 (1996).8 P. Hidalgo, B. Méndez, J. Piqueras, J. Plaza, and E. Diéguez, Semicond. Sci. Technol. 13, 1431 (1998).9 R. J. Hammers, R. M. Tromp, and J. E. Demuth, Phys. Rev. Lett. 56, 1972 (1986).10 R. M. Feenstra, Surf. Sci. 299/300, 965 (1994).11 B. Méndez and J. Piqueras, J. Appl. Phys. 69, 2776 (1991).12 A. Asenjo, A. Buendía, J. M. Gómez-Rodriguez, and A. Baró, J. Vac. Sci. Technol. B 12, 1658 (1994).13 R. M. Feenstra, J. A. Stroscio, and A. P. Fein, Surf. Sci. 181, 295 (1987).14 P. Hidalgo, B. Méndez, P. S. Dutta, J. Piqueras, and E. Diéguez, Phys. Rev. B 57, 6479 (1998).15 B. Méndez, J. Piqueras, P. S. Dutta, and E. Diéguez, Mater. Sci. Eng., B 42, 38 (1996).16 G. Panin, C. Díaz-Guerra, and J. Piqueras, Appl. Phys. Lett. 72, 2129 (1998). NO © 1999 American Institute of Physics.This work was supported by DGES (Project No. PB96-0639) and by CICYT (Project Nos. ESP95-0148 and ESP98-1340) NO DGES NO CICYT DS Docta Complutense RD 18 jul 2024