Figure 5: Comparison of electro-reflectance (ER) spectra for the LED on silicon and sapphire. | Scientific Reports

Figure 5: Comparison of electro-reflectance (ER) spectra for the LED on silicon and sapphire.

From: A comparative study of efficiency droop and internal electric field for InGaN blue lighting-emitting diodes on silicon and sapphire substrates

Figure 5

ER spectra of (a) the LED on silicon and (b) the LED on sapphire with increasing reverse bias voltage. The flat-band voltage, where the phase angle of the ER spectra is changed by 180°, was determined to be −12 V for the LED on silicon and −20 V for the LED on sapphire.

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