High-Pressure Synthesis and Characterization of β-GeSe - A Six-Membered-Ring Semiconductor in an Uncommon Boat Conformation

Fabian O. Von Rohr, Huiwen Ji, F. Alexandre Cevallos, Tong Gao, N. Phuan Ong, Robert J. Cava

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

Two-dimensional materials have significant potential for the development of new devices. Here we report the electronic and structural properties of β-GeSe, a previously unreported polymorph of GeSe, with a unique crystal structure that displays strong two-dimensional structural features. β-GeSe is made at high pressure and temperature and is stable under ambient conditions. We compare it to its structural and electronic relatives α-GeSe and black phosphorus. The β form of GeSe displays a boat conformation for its Ge-Se six-membered ring ("six-ring"), while the previously known α form and black phosphorus display the more common chair conformation for their six-rings. Electronic structure calculations indicate that β-GeSe is a semiconductor, with an approximate bulk band gap of Δ ≈ 0.5 eV, and, in its monolayer form, Δ ≈ 0.9 eV. These values fall between those of α-GeSe and black phosphorus, making β-GeSe a promising candidate for future applications. The resistivity of our β-GeSe crystals measured in-plane is on the order of ρ ≈ 1 Ω·cm, while being essentially temperature independent.

Original languageEnglish (US)
Pages (from-to)2771-2777
Number of pages7
JournalJournal of the American Chemical Society
Volume139
Issue number7
DOIs
StatePublished - Feb 22 2017

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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