title: Semiconductor Nanowire Light-Emitting Diodes Grown on Metal: A Direction Toward Large-Scale Fabrication of Nanowire Devices.
abstract: Bottom-up nanowires are attractive for realizing semiconductor devices with extreme heterostructures because strain relaxation through the nanowire sidewalls allows the combination of highly lattice mismatched materials without creating dislocations. The resulting nanowires are used to fabricate light-emitting diodes (LEDs), lasers, solar cells, and sensors. However, expensive single crystalline substrates are commonly used as substrates for nanowire heterostructures as well as for epitaxial devices, which limits the manufacturability of nanowire devices. Here, nanowire LEDs directly grown and electrically integrated on metal are demonstrated. Optical and structural measurements reveal high-quality, vertically aligned GaN nanowires on molybdenum and titanium films. Transmission electron microscopy confirms the composition variation in the polarization-graded AlGaN nanowire LEDs. Blue to green electroluminescence is observed from InGaN quantum well active regions, while GaN active regions exhibit ultraviolet emission. These results demonstrate a pathway for large-scale fabrication of solid state lighting and optoelectronics on metal foils or sheets.
authors: Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: A T M Golam
authors: AT
authors: Sarwar
authors: Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: Santino D
authors: SD
authors: Carnevale
authors: Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: Fan
authors: F
authors: Yang
authors: Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: Thomas F
authors: TF
authors: Kent
authors: Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: John J
authors: JJ
authors: Jamison
authors: Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: David W
authors: DW
authors: McComb
authors: Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, 43210, USA.|Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA.
authors: Roberto C
authors: RC
authors: Myers
keywords: LEDs; electroluminescence; light-emitting diodes; molecular beam epitaxy; nanowires; quantum efficiency