Transport Properties of Methyl-Terminated Germanane Microcrystallites
Abstract
Germanane is a two-dimensional material consisting of stacks of atomically thin germanium sheets. It’s easy and low-cost synthesis holds promise for the development of atomic-scale devices. However, to become an electronic-grade material, high-quality layered crystals with good chemical purity and stability are needed. To this end, we studied the electrical transport of annealed methyl-terminated germanane microcrystallites in both high vacuum and ultrahigh vacuum. Scanning electron microscopy of crystallites revealed two types of behavior which arise from the difference in the crystallite chemistry. While some crystallites are hydrated and oxidized, preventing the formation of good electrical contact, the four-point resistance of oxygen-free crystallites was measured with multiple tips scanning tunneling microscopy, yielding a bulk transport with resistivity smaller than 1 Ω·cm. When normalized by the crystallite thickness, the resistance compares well with the resistance of hydrogen-passivated germanane flakes found in the literature. Along with the high purity of the crystallites, a thermal stability of the resistance at 280 °C makes methyl-terminated germanane suitable for complementary metal oxide semiconductor back-end-of-line processes.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 29, 2022
- Source ID
- 10.3390/nano12071128
Entities
People
- Ahmed Addad
- Bradley J Ryan
- Bruno Grandidier
- Christophe Boyaval
- Davide Sciacca
- Didier Hocrelle
- Dominique Deresmes
- Emmanuel Lhuillier
- Geoffroy Prévot
- Louis Biadala
- Matthew G. Panthani
- Maxime Berthe
- Nemanja Peric
- Ophélie Lancry
- Pascale Diener
- Raghda Makarem
- S. Legendre
Organizations
- Agence Nationale de la Recherche
- Air Force Office of Scientific Research
- National Science Foundation