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. 2018 May 2;376(3):20. doi: 10.1007/s41061-018-0198-z

Fig. 3.

Fig. 3

Energy levels and light harvesting. Upon irradiation, an electron is promoted to the LUMO leaving a hole behind in the HOMO. Electrons are collected at the Al electrode and holes at the ITO electrode. Φ, workfunction; χ, electron affinity; IP, ionization potential; Eg, optical band gap [57]