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Papers by Author: Leif I. Johansson

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Atomic and Electronic Structure of the (2×1) and c(2×2) 4H-SiC(1-102) Surfaces

Authors: Charíya Virojanadara, M. Hetzel, Leif I. Johansson, Wolfgang J. Choyke, Ulrich Starke

Abstract: The atomic and electronic structure of 4H-SiC(1 1 02) surfaces were investigated using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and photoemission (PES). Two well ordered phases existing on this surface, i.e. (2×1) and c(2×2) are discussed. The (2×1) phase consists of a Si adlayer which is topped by an array of ordered Si-nanowires with electronic states confined to one dimension. For the c(2×2) phase STM indicates the presence of adatoms and PES a surface composition close to bulk SiC stoichiometry. A detailed atomic model for this c(2×2) phase is proposed.

291

Surface and Interface Studies of Si-Rich 4H-SiC and SiO₂

Authors: Charíya Virojanadara, Leif I. Johansson

581

Oxidation Studies of Non-Polar 4H-SiC Surfaces

Authors: Charíya Virojanadara, Leif I. Johansson

1321

A Photoemission Study of Polar and Non-Polar SiC Surfaces Oxidized in N₂O

Authors: Leif I. Johansson, Charíya Virojanadara, Th. Eickhoff, W. Drube

1329

Angle-Resolved Studies of SiO₂/SiC Samples

Authors: Leif I. Johansson, Charíya Virojanadara, Th. Eickhoff, W. Drube

539

Oxidation States Present on SiC (0001) after Oxygen Exposure

Authors: Charíya Virojanadara, Leif I. Johansson

701

Adsorption of Metastable Molecular Oxygen on SiC(0001)-√3 x √3

Authors: Charíya Virojanadara, Leif I. Johansson

697

Impact of the Initial Surface Conditions on Defect Appearance in 4H-SiC Epilayers

Authors: Rositza Yakimova, Henrik Jacobsson, Mikael Syväjärvi, A. Kakanakova-Georgieva, T. Iakimov, Charíya Virojanadara, Leif I. Johansson, Erik Janzén

283

A Core Level Study of ZrN (100) and NbN (100)

Authors: Leif I. Johansson, H.I.P. Johansson

335