Table 3: Comparison of the Band gap values extract from Photoluminescence and UV-Vis-NIR spectroscopy.

Sample/Sample numberPorosity (%)Band gap (eV)
PLUV-Vis-NIR

Si1.14 (as literature)1.09
162.371.881.87
272.021.921.89
376.721.971.94
479.132.011.98
579.682.052.01
680.202.112.09