Common-anion rule and its limits: Photoemission studies of CuInxGa1-xSe2-Ge and CuxAg1-xInSe2-Ge interfaces

Abstract

Synchrotron-radiation photoemission data show that the valence-band discontinuities of CuInxGa1-xSe2-Ge and CuxAg1-xInSe2-Ge interfaces are independent of x within the experimental accuracy of 0.1 eV. We argue that this result is consistent with the Wei-Zunger explanation of the breakdown of the common-anion rule, which is based on a substantial role of the cation d states in determining the valence-band-edge position. © 1987 The American Physical Society.