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Wei L, Li F, Pang S, Wang Y, Guo J, Chen J. First-principles study of polymer-passivated silicon nanowire outer-shell defects. Phys Chem Chem Phys 2022; 24:11169-11174. [PMID: 35476044 DOI: 10.1039/d2cp00572g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly effective defect passivation schemes are very important for the improvement of Si nanowire (SiNW) performances, because large numbers of outer-shell-defect states are caused by the high surface-to-volume ratios of nanowires. In this work, a polymer that can be fabricated by a simple, vacuum-free method at low temperatures, Nafion, was studied for the SiNW outer-shell defect passivation using first-principles calculations. Based on adsorption energy calculations, it was found that the Nafion molecule could firmly adsorb on the surfaces of SiNWs along the 〈112〉 direction. The Nafion-passivated SiNW outer-shell exhibited high stability to a chemical environment. Herein, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) were confined to the center of the SiNW due to being wrapped by the Nafion. The Nafion-passivated SiNWs exhibited an equivalent quantum confinement effect and a larger absorption coefficient compared with the H-passivated SiNWs. This work demonstrated a passivation strategy of SiNW shell defects using functional groups.
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Affiliation(s)
- Lijing Wei
- School of Computer and Information Engineering, Hebei Finance University, Baoding, Hebei 071051, P. R. China
| | - Feng Li
- School of Computer and Information Engineering, Hebei Finance University, Baoding, Hebei 071051, P. R. China
| | - Shaoyuan Pang
- School of Computer and Information Engineering, Hebei Finance University, Baoding, Hebei 071051, P. R. China
| | - Yinglong Wang
- Key Laboratory of Optic-Electronic Information Materials of Hebei Province, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China. .,Department of Primary Education, Baoding Preschool Teachers College, Baoding, Hebei 071051, P. R. China
| | - Jianxin Guo
- Key Laboratory of Optic-Electronic Information Materials of Hebei Province, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China.
| | - Jianhui Chen
- Key Laboratory of Optic-Electronic Information Materials of Hebei Province, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China.
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Mintmire J. Density-functional methods for extended helical systems. ADVANCES IN QUANTUM CHEMISTRY 2022. [DOI: 10.1016/bs.aiq.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dass D. Metallic-semiconducting transition of silicon nanowires by surface passivation. RESULTS IN SURFACES AND INTERFACES 2021. [DOI: 10.1016/j.rsurfi.2021.100009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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