Infrared Light Emission from Semiconductor Devices
نویسندگان
چکیده
We present results using near-infrared (NIR) cameras to study emission characteristics of common defect classes for integrated circuits (ICs). The cameras are based on a liquid nitrogen cooled HgCdTe imaging array with high quantum efficiency and very low read noise. The array was developed for infrared astronomy and has high quantum efficiency in the wavelength range from 0.8 to 2.5 pm. For comparison, the same set of samples used to characterize the performance of the NIR camera were studied using a non-intensified, liquidnitrogen-cooled, slow scan CCD camera (with a spectral range from 400-1100 nm). Our results show that the NIR camera images all of the defect classes studied here with much shorter integration times than the cooled CCD, suggesting that photon emission beyond 1 pm is significantly stronger than at shorter wavelengths . LIGHT (OR PHOTON) EMISSION MICROSCOPY is a common failure analysis technique for semiconductor devices. The considerations involved in using photon emission to successfully analyze defects and failure mechanisms in CMOS ICs are well known [1,2]. IC analysis has typically been performed by collecting visible (390 770 nm) and some near infrared (770 1000 nm, with the NIR band defined as 77
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