Heterostructure Silicon Solar Cells with Enhanced Power Conversion Efficiency Based on Si _<i>x</i> /Ni³⁺ Self-Doped NiO _<i>x</i> Passivating Contact.

The obtained optical band gaps of NiO x -3, NiO x -5, NiO x -10, and NiO x -15 samples are 3.55, 3.52, 3.51, and 3.46 eV, respectively, showing a decreasing trend with the increase in the oxygen flow rate.

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