The UV VIS spectroscopy parameters of as grown Sn_1−βSb_βSe (β = 0, 0.05, 0.10, 0.15, 0.20) crystals.

Samples	Eg (eV)	E'g (eV)	Ep1 (meV)	Ep2 (meV)	E U	σ
β = 0	1.18	1.5724	8.25	7.65	2.116805	0.012213
β = 0.05	1.24	1.5714	7.55	4.55	1.744014	0.014823
β = 0.10	1.37	1.5754	10.71	3.35	2.090782	0.012365
β = 0.15	1.40	1.5687	11.11	3.21	2.036328	0.012695
β = 0.20	1.46	1.5887	24.81	7.75	1.10715	0.02335