Structural and optical properties of {beta}-FeSi{sub 2} film prepared by laser ablation method and comparison of {beta}-FeSi{sub 2} films prepared by three different methods

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:536333

Kakemoto, Hirofumi ^[1]; Makita, Yunosuke ^[1]; Katsumata, Hiroshi ^[1]

---

1. Electrotechnical Lab., Tsukuba, Ibaraki (Japan)

Semiconductive iron disilicide {beta}-FeSi{sub 2} is an attractive material for optoelectronic (laser diode, solar cells, {hor_ellipsis}) and thermoelectric devices that can be integrated on Si substrates. Advantages arise from the direct band-gap ({approximately}0.87 eV), high absorption coefficient (higher than 10{sup 5} cm{sup {minus}1}) and high thermoelectric power figure of merit ({approximately}10{sup {minus}4} K{sup {minus}1}). The authors present here the semiconductor properties of {beta}-FeSi{sub 2} films on Si (100) substrate prepared by laser ablation (LA) method. They compare these results with those obtained from {beta}-FeSi{sub 2} films prepared by ion beam synthesis using high-energy ion implantation and electron beam deposition methods. As for laser ablation, two independent growth processes were adopted using two different target materials. The first one was Fe deposition on Si (100) substrate by LA using Fe target and subsequent high-temperature annealing leading to solid phase epitaxy. The second was LA using {beta}-FeSi{sub 2} bulk polycrystal as a target material which was grown by horizontal gradient freeze method. {beta}-FeSi{sub 2} films prepared by the two processes were heat-treated as a function of annealing temperature and duration time. Structural characterizations were made by reflection high-energy electron diffraction, X-ray diffraction, Raman scattering and optical absorption spectroscopy measurements at room temperature, which revealed that high-quality semiconducting {beta}-FeSi{sub 2} films can be fabricated by two LA processes.

• OSTI ID: 536333
• Report Number(s): CONF-9611124--; ISBN 0-8194-2289-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
IRON SILICIDES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
SYNTHESIS
THERMOELECTRIC MATERIALS