Ge1-y Sny photoconductor structures at 1.55 μm: From advanced materials to prototype devices

R. Roucka, J. Xie, John Kouvetakis, J. Mathews, V. D'Costa, Jose Menendez, J. Tolle, S. Q. Yu

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Prototype detector structures were fabricated on Si substrates using Ge1-y Sny as active material for the first time. This alloy system covers the entire near-IR telecommunication spectrum and grows at a low temperature of 350 °C, compatible with complementary metal-oxide-semiconductor (CMOS) Si technology. Processing protocols were developed for photolithography-based patterning and subsequent etching, CMOS compatible metallization, and for the formation of low-resistivity Ohmic contacts. A first generation of devices based on as-grown Ge1-y Sny layers was followed by a second generation incorporating ex situ rapid thermal annealing for defect reduction, as well as additional growth and processing improvements, leading to enhanced mobilities and simultaneous reduction in intrinsic carrier concentrations. While both device generations show a significant photoconductive response at 1.55 μm, the thicker second-generation samples yield improved performance due to better confinement of deleterious defects near the interface, which increases the optically active fraction of the film.

Original languageEnglish (US)
Pages (from-to)1952-1959
Number of pages8
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Issue number6
StatePublished - 2008

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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