Fig. 2: XPS characterization and band diagrams of the nBn unipolar barrier heterostructure. | Nature Communications

Fig. 2: XPS characterization and band diagrams of the nBn unipolar barrier heterostructure.

From: Enhanced gain and detectivity of unipolar barrier solar blind avalanche photodetector via lattice and band engineering

Fig. 2

a Valence band maximum (VBM) spectra and the core levels for the Nb:STO bulk, MgO bulk, Ga2O3 bulk, and Ga2O3/MgO/Nb:STO interface. Band diagram of Ga2O3/MgO/Nb:STO heterostructure in equilibrium conditions (b) and in avalanche condition (c). d Illustration of the avalanche process in the nBn unipolar barrier APDs.

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