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Schematic illustration of the PV measurements.
(a) Azimuth angle dependence of the FWHM of the rocking curves. (b) AFM images of sample A. (c) AFM images of sample B.
PV measurement results. (a) Sample A under 325 nm illumination. (b) Sample A under 213 nm illumination. (c) Sample B under 325 nm illumination. (d) Sample B under 213 nm illumination.
Polarization in ideal GaN, , sample A, and sample B.
PV measurement results under out-of-door illumination.
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