| 摘要 |
An apparatus (10) for contactless measurement of sheet charge density and mobility includes a microwave source (16), a circular waveguide (50) for transmitting microwave power to a sample (59), such as a semiconductor wafer or panel for flat panel displays, at a measurement location, a first detector (18) for detecting the forward microwave power, a second detector (23) for detecting the microwave power reflected from the sample, and a third detector (95) for detecting the Hall effect power. An automatic positioning subsystem (700) is also provided for allowing automatic positioning of a wafer (59) within the test apparatus (10). The positioning system (700) includes a first end effector (706) and a rotator-lifter (704). The first end effector (706) can grasp a sheet element (59) and move it to a desired position within the test apparatus (10), while the rotator lifter (704) provides incremental adjustment of a theta angle of the sheet element (59) to allow automated mapping of an entire sheet element without the need for manual adjustment of the position of the sheet element. A second end effector (716) can be mounted opposite the first end effector (706) and can be used to automatically position the sheet element (59) within a sheet resistance testing module (718) located at an opposite end of the apparatus (10).
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