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Epitaxial growth of three-dimensionally architectured optoelectronic devices

Abstract

Optoelectronic devices have long benefited from structuring in multiple dimensions on microscopic length scales. However, preserving crystal epitaxy, a general necessity for good optoelectronic properties, while imparting a complex three-dimensional structure remains a significant challenge. Three-dimensional (3D) photonic crystals are one class of materials where epitaxy of 3D structures would enable new functionalities. Many 3D photonic crystal devices have been proposed, including zero-threshold lasers1,2, low-loss waveguides3,4,5, high-efficiency light-emitting diodes (LEDs) and solar cells6,7,8, but have generally not been realized because of material limitations. Exciting concepts in metamaterials, including negative refraction and cloaking, could be made practical using 3D structures that incorporate electrically pumped gain elements to balance the inherent optical loss of such devices9. Here we demonstrate the 3D-template-directed epitaxy of group IIIV materials, which enables formation of 3D structured optoelectronic devices. We illustrate the power of this technique by fabricating an electrically driven 3D photonic crystal LED.

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Figure 1: Three-dimensionally patterned GaAs photonic crystals.
Figure 2: Verification of epitaxy during 3D patterned growth.
Figure 3: Heterogeneous nucleation behaviour during 3D selective area epitaxy.
Figure 4: Surface passivation of 3D structured group IIIV materials.
Figure 5: Electrically driven emission from 3D photonic crystal LED.

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Acknowledgements

We would like to thank M. Sardella and J. Soares of the Materials Research Lab for experimental assistance and helpful discussions. The 3D epitaxy growth process development was supported by the US Army Research Office Award #DAAD19-03-1-0227, fabrication and testing of optoelectronic devices was supported by the US Department of Energy ‘Light–Material Interactions in Energy Conversion’ Energy Frontier Research Center Award #DE-SC0001293, design of optoelectronic devices was supported by the US Department of Energy ‘Center for Energy Nanoscience’ Energy Frontier Research Center Award #DE-SC0001013, and optimization of the MOCVD reactor was supported by NSF Award #0749028. E.C.N. would like to thank the Beckman Institute for a Doctoral Fellowship.

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E.C.N., V.V., N.L.D., P.V.B. and J.J.C. conceived the initial approach. E.C.N., V.V., N.L.D. and K.P.B. performed the MOCVD growth and evaluated MOCVD data along with J.J.C. and X.L.; remaining data was evaluated by all authors. M.M. and P.W. fabricated the polymeric templates by means of interference lithography and performed conversion to alumina. S.N.D. and E.C.N. developed the device processing; E.C.N. fabricated all devices (with N.L.D. and S.N.D. contributing) and performed all sample characterization and finite element modelling. E.C.N. and P.V.B. wrote the paper.

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Correspondence to Paul V. Braun.

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Nelson, E., Dias, N., Bassett, K. et al. Epitaxial growth of three-dimensionally architectured optoelectronic devices. Nature Mater 10, 676–681 (2011). https://doi.org/10.1038/nmat3071

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