Core level and valence-band studies of the (111)2×2 surfaces of InSb and InAs

Chemical reaction and interface formation on InAs(111)–Co surfaces

“…The interaction between As and Co is different, evidenced by the return of the As 3d core level spectra to their [20,21]. The features A 1 and A 2 are not identified, but might be bulk derived since they reappear after thermal treatment.…”

“…A 3 , which appears after the deposition of Co, is due to the electrons in the metallic overlayer. On the A-side, S 2 was previously identified as a surface state by Olsson et al [20], whereas A 1 , was unidentified in their paper. A 1 reappears after heat treatment at the lower temperature together with the other bulk features, indicative of a bulk origin.…”

First-principles investigations of surface reconstructions of an InAs(111)B surface

“…From the view point of the electron-counting model (ECM), which is the very powerful guiding principle to determine the stable surface structure in III-V semiconductors [4], it is strange that the 1  1 unreconstructed surface is stable, because the unreconstructed surface does not satisfy the ECM. The surface properties of InAs would be similar to those of GaAs, because for (0 0 1) and (1 1 1)A surfaces the stable reconstructions of InAs are the same as those of GaAs [5][6][7]. For GaAs(1 1 1)B surface, the STM observation shows that the stable surface structures are ffiffiffiffiffi 19 p  ffiffiffiffiffi 19 p reconstruction and 2  2 As-trimer reconstruction [8].…”

Clean reconstructed InAs(111) A and B surfaces using chemical treatments and annealing

“…Recently, polar (1 1 1) III-V surfaces have attracted great interest as possible substrates for the growth of low-dimensional quantum structures [1], important for a number of potential applications, ranging from QD lasers and photodetectors, to single polarized photon sources. So far, InAs(1 1 1) A and B surfaces have been prepared using in situ epitaxial growth [2,3], ion sputtering followed by annealing [4,5], atomic hydrogen treatment [6], and various wet treatments [7,8]. The A face exhibits a (2 Â 2) reconstruction [3][4][5][6][7], while the B face exhibits (1 Â 1) or (2 Â 2) structures depending on the preparation technique [2,5].…”