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Direct gap Group IV semiconductors for next generation Si-based IR photonics

Published online by Cambridge University Press:  07 July 2014

John Kouvetakis ,
James Gallagher  and
José Menéndez
John Kouvetakis
Affiliation:
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85207, U.S.A.
James Gallagher
Affiliation:
Department of Physics, Arizona State University, Tempe, AZ 85207, U.S.A.
José Menéndez
Affiliation:
Department of Physics, Arizona State University, Tempe, AZ 85207, U.S.A.
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Abstract

This paper presents synthesis and optical properties of mono-crystalline Ge1-ySny and Ge1-x-ySixSny semiconductor alloys grown on Si/Ge platforms via purposely designed CVD routes using highly reactive Si/Ge/Sn hydrides including Ge3H8, Ge4H10, Si4H10 and SnD4. The Ge1-ySny materials are shown to exhibit strong and tunable photoluminescence induced by the substitution of sizable Sn concentrations in the Ge diamond lattice ultimately leading to an indirect-to-direct band gap crossover at y= 0.08-0.09. The optical data indicate that the IR coverage of the alloy extends well beyond that of elemental Ge into the broader long wavelength range suggesting a variety of applications in Si-based photonics. Ge1-x-ySixSny alloys represent the first viable ternary semiconductor among group IV elements with independently tunable lattice parameter and electronic structure. Studies of the compositional dependence of direct and indirect edges in these alloys using photoluminescence and photocurrent measurements are reviewed. The optical results show band gap variation over a wide range above and below that of Ge from 1.1 to 0.5 eV and provide the first demonstration of direct gap behavior in this semiconductor system.

Keywords

photoemissionsemiconductingphotoconductivity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1666: Symposium A – Film-Silicon Science and Technology , 2014 , mrss14-1666-a06-01
Copyright
Copyright © Materials Research Society 2014 

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References

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