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. 2020 Jun 4;10(6):1110. doi: 10.3390/nano10061110

Figure 2.

Figure 2

Bandgap in a semiconducting material. A valence band electron (e−) is excited to the conduction band upon light absorption (of ≥ bandgap energy) and leaves a hole in the valence band (h+) (according to [4,13]).