Table 3. Band gap and B^1/2 values of as deposited and annealed (GST)_1-xSe_x films.

Sample	Band gap (eV)	B1/2(cm−1/2 eV−1/2)
GST AD	0.63	678
(GST)0.98 Se0.02 AD	0.67	671
(GST)0.90 Se0.10 AD	0.66	621
(GST)0.80 Se0.20 AD	0.64	492
(GST)0.50 Se0.50 AD	1.05	500
GST 150°C	0.38	699
(GST)0.98 Se0.02 150°C	0.47	680
(GST)0.90 Se0.10 150°C	0.50	646
(GST)0.80 Se0.20 150°C	0.57	611
(GST)0.50 Se0.50 150°C	0.71	520
GST 300°C	0.24	700
(GST)0.98 Se0.02 300°C	0.28	683
(GST)0.90 Se0.10 300°C	0.30	661
(GST)0.80 Se0.20 300°C	0.33	685
(GST)0.50 Se0.50 300°C	0.53	531