Chemical and Biological Engineering
Research Focus Area
Advanced and Nanostructured Materials
Journal or Book Title
Applied Physics Letters
Germanane is a two-dimensional, strongly confined form of germanium. It presents an interesting combination of (i) ease of integration with CMOS technology, (ii) low toxicity, and (iii) electronic confinement which transforms the indirect bandgap of the bulk material into a direct bandgap featuring photoluminescence. However, the optoelectronic properties of this material remain far less investigated than its structural properties. Here, we investigate the photoluminescence and transport properties of arrays of methyl-terminated germanane flakes. The photoluminescence appears to have two contributions, one from the band edge and the other from trap states. The dynamics of the exciton appear to be in the range of 1–100 ns. Conduction in this material appears to be p-type, while the photoconduction time response can be made as short as 100 μs.
Livache, Clément; Ryan, Bradley J.; Ramesh, Utkarsh; Steinmetz, Violette; Gréboval, Charlie; Chu, Audrey; Brule, Thibault; Ithurria, Sandrine; Prévot, Geoffrey; Barisien, Thierry; Ouerghi, Abdelkarim; Panthani, Matthew G.; and Lhuillier, Emmanuel, "Optoelectronic properties of methyl-terminated germanane" (2019). Chemical and Biological Engineering Publications. 384.