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The dielectric barrier corona discharge (DBCD) in a wire-cylinder configuration and the dielectric barrier discharge (DBD) in a coaxial cylinder configuration are studied. The discharge current in DBD has higher pulse amplitude than in DBCD. The dissipated power and the gas gap voltage are calculated by analyzing the measured Lissajous figure. DBCD has lower gas gap breakdown voltage. The average electric field is about 10–20 kV/cm in gas gap during DBCD, and is 30–40 kV/cm during DBD. In the positive half cycle the DBCD appears as continuous discharge current mode and in negative half cycle it appears as Trichel pulse mode. Under some conditions DBCD can show homogeneous diffuse discharges mode.

As the angle of the miscut of a Si(111) substrate increases, the luminous efficiency of InGaN LEDs decreases dramatically, along with a considerable blue shift of emission wavelength. The blue shift of the wavelength and the decrease in the efficiency are found to originate from the reduced indium incorporation and the poor uniformity of the quantum wells. The origin of the nonuniform indium incorporation of the samples is attributed to the surface morphologies formed by step bunching, as confirmed by atomic force microscopy measurements.

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