Abstract
We experimentally and theoretically investigate the relationship between the electroreflectance (ER) and photocurrent (PC) spectra, and how they can be utilized to estimate the flat-band voltage and the bandgap energy of the InGaN/GaN-based quantum-well (QW) structure in blue light-emitting diodes. With theoretical modeling of ER and PC spectra, we calculate the changes in both the refractive index ( $\Delta \text{n}$ ) and optical absorption ( $\Delta \alpha )$ spectra from experimental ER and PC data by using the Kramers–Kronig relation. Then, we compare $\Delta \text{n}$ (or $\Delta \alpha )$ spectra obtained differently from the ER and PC data and try to comprehend their physical meanings interactively. From these combined studies, we propose an exact method of determining the flat-band voltage, the piezoelectric field, the emission energy, the effective bandgap energy, and the Stokes shift of a QW structure under the quantum-confined Stark effect (QCSE).
Published Version
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