Patent ID: 9638741
Date: 2017-05-02
CPC Classifications: G01N,G01R,H01L

Claim:
1. An apparatus for inspection of light emitting semiconductor devices on a substrate, comprising: a broadband light source configured to simultaneously illuminate two or more light emitting semiconductor devices of the substrate at one or more points in a semiconductor production process, wherein at least some of the light emitting semiconductor devices, in response to the illumination from the broadband source, emit at least some light caused by a recombination process of electron-hole pairs in an active layer of the light emitting semiconductor devices; an objective lens defining a detection beam path; a camera with a sensor positioned in the detection beam path for receiving light from the light emitting semiconductor devices via the objective lens, wherein the sensor registers gray scale values for the two more light emitting semiconductor devices; a first filter disposed within in an illumination beam path of the broadband light source, wherein the first filter is configured to pass a waveband λ a second filter disposed within the detection path, wherein the second filter is configured to block reflected incident light from reaching the sensor, wherein the second filter is further configured to pass light emitted by one or more of the light emitting semiconductor devices of at least a wavelength of λ a computer system communicatively coupled to the sensor, wherein the computer system is configured to determine one or more characteristics of the semiconductor production process based on the light of wavelength λ