Which of the following statements is INCORRECT for SCR? 

Silicon-controlled rectifier (SCR)

• It is a 4-layer, 3-junction semiconductor device. Additionally, it has three terminals: anode, cathode, and gate.
• An SCR is considered to be a semi-controlled device because it can be turned on but not off with a gate pulse. During the positive half cycle, SCR is in forwarding blocking mode.
• By applying a gate pulse, the SCR can be turned ON. Once turned ON, gate signal can be removed.
• ​SCR (Silicon-Controlled Rectifier) is a unidirectional device because it allows current to flow only in one direction from anode to cathode when it is in conduction mode.
• SCRs (Silicon-Controlled Rectifiers) are made of silicon, not germanium. Silicon is preferred due to its higher temperature stability, better power handling capacity, and lower leakage current compared to germanium.