We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Catalyst-free synthesis of sub-5 nm silicon nanowire arrays with massive lattice contraction and wide bandgap.
- Authors
Gao, Sen; Hong, Sanghyun; Park, Soohyung; Jung, Hyun Young; Liang, Wentao; Lee, Yonghee; Ahn, Chi Won; Byun, Ji Young; Seo, Juyeon; Hahm, Myung Gwan; Kim, Hyehee; Kim, Kiwoong; Yi, Yeonjin; Wang, Hailong; Upmanyu, Moneesh; Lee, Sung-Goo; Homma, Yoshikazu; Terrones, Humberto; Jung, Yung Joon
- Abstract
The need for miniaturized and high-performance devices has attracted enormous attention to the development of quantum silicon nanowires. However, the preparation of abundant quantities of silicon nanowires with the effective quantum-confined dimension remains challenging. Here, we prepare highly dense and vertically aligned sub-5 nm silicon nanowires with length/diameter aspect ratios greater than 10,000 by developing a catalyst-free chemical vapor etching process. We observe an unusual lattice reduction of up to 20% within ultra-narrow silicon nanowires and good oxidation stability in air compared to conventional silicon. Moreover, the material exhibits a direct optical bandgap of 4.16 eV and quasi-particle bandgap of 4.75 eV with the large exciton binding energy of 0.59 eV, indicating the significant phonon and electronic confinement. The results may provide an opportunity to investigate the chemistry and physics of highly confined silicon quantum nanostructures and may explore their potential uses in nanoelectronics, optoelectronics, and energy systems. The preparation of quantum silicon nanowires, materials with potential application in high-performance nanodevices, is challenging. Here, the authors synthesize vertically aligned sub-5 nm silicon nanowires via a vapor phase silicon etching process; the resulting material features unusual lattice reduction and significant phonon and electronic confinement effects.
- Subjects
SILICON nanowires; NANOWIRES; EXCITON theory; BINDING energy; POLAR effects (Chemistry); MANUFACTURING processes; OPTOELECTRONICS; PHONONS
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-31174-x