WIT Press


Polytypic Heterojunctions For Wide Bandgap Semiconductor Materials

Price

Free (open access)

Paper DOI

10.2495/MC150251

Volume

90

Pages

10

Page Range

273 - 282

Published

2015

Size

421 kb

Author(s)

M. Shenkin, O. Korolkov, T. Rang, G. Rang

Abstract

The bonding of crystallic semiconductor structures for getting polytypic heterojunctions on the basis of wide band gap semiconductor materials has considerably increased. The direct wafer bonding technology for the creation of polytypic heterojunctions (e.g. silicon carbide polytypes like 4H-SiC, 6H-SiC, 3C-SiC) gives an advantage in obtaining heterojunctions on the basis of different polytypes improves the electrical and physical properties of devices without lattice mismatch problems. The bonding of SiC wafers is an extremely challenging process even under ideal surface conditions. The hardness and inertness of SiC renders possesses a huge influence for surface preparation. Such parameters as roughness, flatness, waviness, and an extremely important aspect like cleanliness of surfaces have to be tightly controlled.

This paper shows a state-of-the-art-today’s situation: the physical background and surface preparation problems before the direct bonding; the technological possibilities and possible practical solutions.

Keywords

silicon carbide, polytypic heterojunctions, wafer bonding/diffusion welding, surface preparation