1. Vertical monolithic integration of wide- and narrow-bandgap semiconductor nanostructures on graphene films
- Author
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Dongha Yoo, Keundong Lee, Hyeonjun Baek, HoSung Kim, Won Jun Choi, Miyoung Kim, Youngbin Tchoe, Heehun Kim, Gyu-Chul Yi, and Janghyun Jo
- Subjects
010302 applied physics ,Materials science ,Graphene ,Band gap ,business.industry ,Photodetector ,02 engineering and technology ,Substrate (electronics) ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Epitaxy ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Modeling and Simulation ,0103 physical sciences ,Optoelectronics ,General Materials Science ,Nanorod ,Indium arsenide ,0210 nano-technology ,business ,Molecular beam epitaxy - Abstract
We report monolithic integration of indium arsenide (InAs) nanorods and zinc oxide (ZnO) nanotubes using a multilayer graphene film as a suspended substrate, and the fabrication of dual-wavelength photodetectors with the hybrid configuration of these materials. For the hybrid nanostructures, ZnO nanotubes and InAs nanorods were grown vertically on the top and bottom surfaces of the graphene films by metal-organic vapor-phase epitaxy and molecular beam epitaxy, respectively. The structural, optical, and electrical characteristics of the hybrid nanostructures were investigated using transmission electron microscopy, spectral photoresponse analysis, and current–voltage measurements. Furthermore, the hybrid nanostructures were used to fabricate dual-wavelength photodetectors sensitive to both ultraviolet and mid-infrared wavelengths. Wide- and narrow-bandgap semiconductor nanostructures were monolithically integrated on graphene layers by direct heteroepitaxial growth. The structural, optical, and electrical characteristics of the hybrid nanostructures were investigated. Furthermore, dual-wavelength photodetectors sensitive to both ultraviolet and mid-infrared wavelengths were fabricated using the hybrid nanostructures. more...
- Published
- 2021
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