Abstract
The electrical and optical properties of InGaN–GaN light-emitting
diodes (LEDs) emitting in the 400–500-nm range and having a
v-shaped quantum well (VSQW) and a u-shaped quantum well (USQW) are
numerically investigated using APSYS simulation program. The simulation
results showed that the devices containing VSQW have superior performance
in terms of optical power and internal quantum efficiency droop compared
to those with USQW. The optical power of the LEDs containing USQW
increases gradually and reaches a maximum at 460 nm; however, the
optical power of the LEDs with VSQW improves gradually, and the maximum
is obtained in a window from 420 to 436 nm as a result of radiative
recombination enhancement. The simulation results suggest that the
higher performance of the VSQW is due to piezoelectric field reduction
and an enhancement of electron and hole wave functions overlap.
© 2014 IEEE
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