Abstract
UV photoemission spectroscopy (UPS) experiments have been carried out on the layer compound ZnIn 2S 4 employing several different photon energies in the range h ̵ ω = 9.5−21.2 eV . The energy distribution curves (EDC's) exhibit four valence band density of states structures besides the Zn 3 d peak. These five peaks appear 0.90 eV, 1.6 eV, 4.3 eV, 5.8 eV and 8.7 eV respectively below the top of the valence band, E v . The atomic orbital character of the shallowest peak A appears different from that of the three deeper valence band peaks B, C and D and this is discussed in terms of the more or less pronounced ionic character of the intralayer chemical bonds. These results demonstrate that an overall understanding of the electronic states in complex structures can be achieved by an approach based on photoemission experiments and chemical bonding considerations which has been widely used in the past to study simple binary layer compounds.
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