First-principle calculations are performed to study the structural, electronic, optical and thermodynamic properties of hydrogenated germanene (germanane) for most stable chair (C-), boat (B-) and tricycle (T-) structures. The band structure is studied under different hydrostatic pressures. The germanane shows metallic behavior at 30 GPa, 25 GPa and 12 GPa external pressures, respectively, for C-, B- and T-configurations. The calculated binding energy shows that germanane becomes unstable at 30 GPa, 25 GPa and 6 GPa for C-, B- and T-conformers, respectively. The thermodynamic properties of germanane are calculated in the temperature range of 5–1000 K and compared with germanene. The optical parameters such as dielectric constant, refractive index, birefringence, and plasmon energies ($ħ$ω_p) have been calculated for the first time. The calculated values are in good agreement with the experimental and reported values.

进行第一性原理计算，以研究最稳定的椅子（C-），船形（B-）和三轮车（T-）结构的氢化锗烯（锗烷）的结构，电子，光学和热力学性质。研究了在不同静水压力下的能带结构。对于C-，B-和T-构型，锗烷分别在30 GPa，25 GPa和12 GPa的外部压力下表现出金属性能。计算的结合能表明，对于C-，B-和T-构象异构体，锗烷在30 GPa，25 GPa和6 GPa时变得不稳定。在5–1000 K的温度范围内计算出锗烷的热力学性质，并将其与锗烯进行比较。光学参数，例如介电常数，折射率，双折射和等离激元能量（$H$ω _p）已经被计算出的第一次。计算值与实验值和报告值非常吻合。