Patent ID: 7652867

Claim:
Mobile, transportable electrostatic chuck comprising a semiconductor substrate material ( 3 ), clamping a thin process-wafer ( 2 ) thereon by applying a clamping voltage, without permanent connection to an external power supply unit for transportation or other process steps, where the size and thickness of the clamped wafer and the Mobile Chuck is similar of size, thickness and shape as a standard wafer, comprising: a semiconductor substrate material ( 3 ) used as unipolar electrode; said semiconductor substrate material ( 3 ) comprising a pn-junction made of doped semiconductor n- and p-type layers ( 8 , 9 ) inside the said substrate material ( 3 ) creating a diode; said diode is reverse biased during unintentional discharging by a short circuit between the clamped wafer ( 2 ) and the contact holes ( 5 ) of the Mobile Chuck ( 1 ).