High performance group IV photodiodes with tunable absorption edges based on ternary SiGeSn alloys

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

We describe the fabrication of ternary SiGeSn photodiodes and compare the optical and electrical properties of heterostructure devices with the same target compositions (Si: 8-11 %, Sn: 1.7- 2.3 %) grown directly on Si(100) and Ge(100) substrates via UHVCVD reactions of SnD4, Si3H8 and Ge2H6. We show that the quantum efficiency and dark current levels of near lattice-matched alloys grown on Ge wafers are superior to those of comparable Ge devices. The corresponding optoelectronic properties of analogous SiGeSn devices grown on Si are significantly degraded due to the inferior microstructure resulting from the lattice mismatch between the substrate and epilayer. Finally, we also show that minor variations in composition produce significant shifts in the absorption edge of the devices grown on Ge. Collectively the SiGeSn diodes described here exhibit enhanced performance over any previous Sn based group-IV system, underscoring the potential of this 1 eV gap material as versatile candidates for next generations of Si-based optoelectronics, including multijunction photovoltaics.

Original languageEnglish (US)
Title of host publicationSiGe, Ge, and Related Compounds 5
Subtitle of host publicationMaterials, Processing, and Devices
Pages591-599
Number of pages9
Edition9
DOIs
StatePublished - Dec 1 2012
Event5th SiGe, Ge, and Related Compounds: Materials, Processing and Devices Symposium - 220th ECS Meeting - Honolulu, HI, United States
Duration: Oct 7 2012Oct 12 2012

Publication series

NameECS Transactions
Number9
Volume50
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other5th SiGe, Ge, and Related Compounds: Materials, Processing and Devices Symposium - 220th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period10/7/1210/12/12

ASJC Scopus subject areas

  • Engineering(all)

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    Beeler, R. T., Menendez, J., Smith, D., & Kouvetakis, J. (2012). High performance group IV photodiodes with tunable absorption edges based on ternary SiGeSn alloys. In SiGe, Ge, and Related Compounds 5: Materials, Processing, and Devices (9 ed., pp. 591-599). (ECS Transactions; Vol. 50, No. 9). https://doi.org/10.1149/05009.0591ecst