Abstract
We model the process of incoherent emission from \(\hbox {In}_{x}\hbox {Ga}_{1-x}\hbox {N/GaN}\) quantum wells in GaN core–shell nanorod arrays using finite-difference time-domain simulations. We find that high-intensity features in the emitted field correspond to guided resonance modes near the \(\varGamma \)-point of the photonic band structure. We identify one \(\varGamma \)-point mode whose electric field intensity profile is ideal for core–shell nanorod array geometries. Using this mode, we are able to simultaneously enhance the radiative recombination rate and extraction efficiency relative to an in-filled slab. We determine the conditions on radiative and nonradiative recombination rates for which the nanorod array has a higher internal and external quantum efficiency than a reference slab. We present one nanorod array geometry where the external quantum efficiency is enhanced up to a factor of 25.
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Acknowledgments
P. Duke Anderson and Michelle L. Povinelli were funded by the Center for Energy Nanoscience, an Energy Frontiers Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0001013. Chenxi Lin was supported by the USC Graduate School’s Theodore & Wen-Hui Chen Fellowship. The authors would like to thank P. Daniel Dapkus for discussions on core–shell GaN nanorod array LEDs and Ningfeng Huang for optical modeling input. Computing resources were provided by the USC Center for High Performance Computing and Communication (HPCC).
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Anderson, P.D., Lin, C. & Povinelli, M.L. Effect of guided resonance modes on emission from GaN core–shell nanorod arrays. Appl. Phys. A 117, 1879–1884 (2014). https://doi.org/10.1007/s00339-014-8602-1
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DOI: https://doi.org/10.1007/s00339-014-8602-1