High purity germanium detector in rare event detection

High purity germanium detector is of great significance to development of low background rare event detectors．This paper reviews work principle and preparation process of HPGe．Both passivation and dead layers are analyzed. Key techniques in background reduction are discussed．HPGe detectors have been used in rare event detection including dark matter detection and neutrinoless double beta decay detection．Typical works include those of CDEX, SuperCDMS, GERDA, and MAJORANA．Future directions of HPGe for international rare events detections are analyzed．