Abstract
Methylated germanane, a layered material in which single-layer germanium is terminated by methyl groups, was utilized as a channel material of back-gate-type FETs. Titanium (Ti) and nickel (Ni) were used as source and drain electrodes of FETs, and the FET with the Ti electrode showed ambipolar characteristics, whereas that with the Ni electrode showed p-type characteristics. The maximum hole mobility at RT is 380 cm2V−1s−1, which is higher than those of typical transition metal dichalcogenides. The mobility changes with temperature T according to the T −3/2 law at temperatures ranging from 243 to 343 K, suggesting that the major scattering factor of holes is acoustic phonons.
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