Patent Number: 
Section: claims

1. An ion implanter for compensating for a wafer cut angle, the ion implanter comprising:an orienter adapted to rotate a wafer mounted on an alignment stage thereof to align a notch of the wafer;a wafer stage adapted to have the wafer whose notch has been aligned mounted thereon;an ion implantation angle adjustment unit adapted to adjust an angle of the wafer stage;a cut angle measurement unit adapted to measure the wafer cut angle while the wafer is mounted and rotated on the alignment stage; anda controller adapted to calculate the wafer cut angle and to control the ion implantation angle adjustment unit to compensate for the calculated wafer cut angle. 2. The implanter of claim 1, wherein the cut angle measurement unit includes:a beam generator adapted to generate and irradiate a beam into the wafer; anda detector adapted to receive the beam that is irradiated from the beam generator and reflected from the rotating wafer and to generate a detection signal. 3. The implanter of claim 2, wherein the cut angle measurement unit further includes a beam path adjustment unit adapted to adjust a path of the beam irradiated into the wafer to make the beam inclinedly incident on the wafer. 4. The implanter of claim 2, wherein the controller is adapted to derive, based on the detection signal, a variation of an intensity amount and/or a wavelength of the beam that is caused by rotation of the wafer and to calculate the wafer cut angle based on the variation of the intensity amount and/or the wavelength of the beam. 5. The implanter of claim 4, wherein the controller is adapted to calculate the wafer cut angle using pre-stored data representing a relationship between the wafer cut angle and the variation of the intensity amount and/or the wavelength of the beam. 6. An ion implantation method for compensating for a wafer cut angle, the method comprising:mounting a wafer on a support element;manipulating the support element so as to align a notch of the wafer;calculating the wafer cut angle;adjusting an ion implantation angle of the wafer in consideration of the calculated wafer cut angle; andinjecting an ion beam to implant ions into the wafer. 7. The method of claim 6, wherein the step of calculating the wafer cut angle includes:irradiating a beam into the wafer and receiving the beam that is reflected from the rotating wafer;generating a detection signal based on the received beam;deriving, based on the detection signal, a variation of an intensity amount and/or a wavelength of the beam that is caused by rotation of the wafer; andcalculating the wafer cut angle based on the variation of the intensity amount and/or the wavelength of the beam. 8. The method of claim 7, wherein a path of the beam irradiated into the wafer is adjusted to make the beam inclinedly incident on the wafer. 9. The method of claim 7, wherein the wafer cut angle is calculated using pre-stored data representing a relationship between the wafer cut angle and the variation of the intensity amount and/or the wavelength of the beam.