Wang Chen, Xu Yi-Hong, Li Cheng, Lin Hai-Jun, Zhao Ming-Jie. Improved performance of Al/n+Ge Ohmic contact andGe n+/p diode by two-step annealing methodJ. Acta Physica Sinica, 2019, 68(17): 178501. DOI: 10.7498/aps.68.20190699