The PL is a non-monotonic function of time exposure of PS in Se acid. After initial growth, the PL starts to decrease after exposures of 90 s and more. The XPS analysis shows that the process of redistribution between the silicon-oxygen and silicon-selenium-oxygen bonds takes place after PS surface treatment with selenious acid. No peaks for selenium oxide, free selenium or selenious acid were found in the Se3d spectra, indicating that selenium is bound to the silicon through oxygen.
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