File Name : figure s1.tif

Caption : fig. s1 (a) the fesem image of sb2si2te6. elemental mapping images showing the distribution of (i) sb, (ii) si, and (iii) te  (b) detailed quantification results revealing the atomic percent of each element.

File Name : figure s2.tif

Caption : fig. s2  (a), (b), (c), the fesem images of sb1.98y0.02si2te6. elemental mapping images showing es showing the distribution of (i) sb, (ii) si, (iii) te and (iv) y. (d) detailed quantification results revealing the atomic percent of each element.

File Name : figure s3.tif

Caption : fig. s3 powder x-ray diffractogram of sb1.98y0.02si2te6, spanning from 2θ=10 – 80֯.

File Name : figure s4.tif

Caption : fig. s4 the graphical representation of rietveld refinement of (a) sb2si2te6, (b) sb1.99y0.01si2te6, (c) sb1.98y0.02si2te6, (d) sb1.97y0.03si2te6.

File Name : figure s5.tif

Caption : fig. s5 powder x-ray diffractogram of sb1.96y0.04si2te6 spanning from 2θ=10 – 80֯

File Name : figure s6.tif

Caption : fig. s6 xps survey spectra for sb1.98y0.02si2te6, reporting binding energies of (a) sb, (b) si, (c) y, and (d) te