Fig. 5. The analysis of in-plane lattice constant a versus bandgaps in layered GaSe1−xSx (0 ≤ x ≤ 0.4) series compounds with similar structure18,19 together with those of the curvature-dependent bending GaSe results are also included for comparison. The fitting result [a(Eg), depicted as the blue solid line] shows a good fit that extending to the BPL region of different curvatures of GaSe as shown in the inset. It can be utilized to analyze lattice constant vs. bandgap change in bending GaSe.
