Patent ID: 7015051

Claim:
A method of inspecting a semiconductor device chip wafer, said method comprising: a step of passing a constant current between a surface and a backside of a wafer in which semiconductor device chips are integrated; a step of irradiating the wafer with a quantum beam having a wavelength which is transmitted through an inside of a crystal of the wafer and does not generate an electromotive force due to excitation while the quantum beam is scanned; a step of detecting a change in current generated by irradiating a crystalline abnormal part of the wafer and of displaying the change in current, wherein the display is performed by displaying a relationship between an irradiation position of the quantum beam and the change in voltage or current corresponding to the irradiation position in a form of a display image; and a step of previously providing a single-chip electrode of each laser diode chip in only one of the surface of and the backside of the wafer, wherein the semiconductor device is a semiconductor laser diode, and the irradiation is performed from the surface in which the single-chip electrode is not provided.