Large-area x-ray topographic screening of II-VI substrates and epilayers

Don Di Marzio; David J. Larson Jr.; Louis G. Casagrande; Jun Wu; Michael Dudley; Stephen P. Tobin; Peter W. Norton

doi:10.1117/12.179671

13 July 1994 Large-area x-ray topographic screening of II-VI substrates and epilayers

Don Di Marzio, David J. Larson Jr., Louis G. Casagrande, Jun Wu, Michael Dudley, Stephen P. Tobin, Peter W. Norton

Proceedings Volume 2228, Producibility of II-VI Materials and Devices; (1994) https://doi.org/10.1117/12.179671
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

A crucial aspect of process control in II-VI based device fabrication is the detailed monitoring of material properties, particularly structural quality. We have developed a method of mapping structural defects over large wafer areas using synchrotron white beam x-ray topography and have used it to characterize large area single crystal CdZnTe substrates and LPE HgCdTe epilayers grown on them. The synchrotron white beam technique produces high resolution topographic images of whole wafers regardless of long range strain, and the multiple images generated as a result of the polychromatic white beam (Laue geometry) provide an automatic defect depth profiling. The topographs reveal various types of defect structure in the CdZnTe substrates, and we have compared these topographic images to IR micrographs and x-ray rocking curve maps. Defect structures as revealed by the x-ray topographs were then followed from the CdZnTe substrates to the LPE grown HgCdTe epilayers. Epilayer topographs were also compared to conventional optical micrographs as well as with x-ray rocking curve maps. Finally, a scanning stage was constructed to topographically image large wafers and boule slabs.

Citation Download Citation

Don Di Marzio, David J. Larson Jr., Louis G. Casagrande, Jun Wu, Michael Dudley, Stephen P. Tobin, and Peter W. Norton "Large-area x-ray topographic screening of II-VI substrates and epilayers", Proc. SPIE 2228, Producibility of II-VI Materials and Devices, (13 July 1994); https://doi.org/10.1117/12.179671

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