Optical Beam Induced Current

Optical Beam Induced Current is a semiconductor failure analysis technique which is used to locate damaged junctions, buried diffusion regions and gate oxide shorts.

It is performed using a scanned laser beam to create electron-hole pairs in a semiconductor being tested.  This will induce a current which may be analyzed to determine the properties of the semiconductor.

This process can only occur if the photon carries enough energy to overcome the bandgap of the semiconductor.

photocurrent map cropped

Key Issues

  • Short Wavelength Required

    Laser excitation needs to have a higher energy than the bandgap of the material being studied

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