Figure 2
From: Tunability of the bandgap of SnS by variation of the cell volume by alloying with A.E. elements
Change in unit cell volume by alloying the SnS film with A.E. elements and confirmation of structure. (a) Dependence of the ionic radii of A.E. elements on the C.N. Ba2+, Sr2+, and Ca2+ are candidates for expanding the unit cell volume of SnS by replacing the Sn site. (b, c) Dependence of the XRD peak position of SnS (Pnma: JCPDS card number 23-0677 on the amount of alloyed A.E. element (Ba2+, Sr2+, and Ca2+). The 111 peak continuously shifted towards lower angles with increasing A.E. element content. No peaks aside from 111 were observed except for the highly Ba-alloyed SnS film. (d) Raman spectra of Ba-, Sr-, and Ca-alloyed and pure SnS films. Neither film contained any Sn–S phases other than SnS (Pnma).
