Schematic diagram of sample structures and conduction energy bands.
(Color online) Normalized GIXRD (110)-plane ω–2θ scan curves for sample H (a) and sample L (b) at different grazing incident angles α.
(Color online) Room temperature PL spectra of sample H (a) and sample L (b) as a function of an applied bias voltage. Thick lines represent measured PL spectra and thin lines represent the Gaussian fitting curve. (c) PL peak energy shift of these two samples as a function of the applied bias voltage.
(Color online) Normalized PL spectra of the sample H and L at room temperature.
(Color online) Normalized integrated PL intensity of the main emission for sample H and L together with the best fitting of the Arrhenius plot. The inset shows the temperature-dependent PL spectra of these two samples over the temperature range from 10 to 300 K.
Obtained fitting parameters: activation energies (EA 1 and EA 2) and constants (C 1 and C 2) together with the IQE.
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