|
English
|
正體中文
|
简体中文
|
全文笔数/总笔数 : 62830/95882 (66%)
造访人次 : 4037679
在线人数 : 561
|
|
|
数据加载中.....
|
jsp.display-item.identifier=請使用永久網址來引用或連結此文件:
https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/115544
|
题名: | Tunable nonthermal distribution of hot electrons in a semiconductor injected from a plasmonic gold nanostructure |
作者: | Cushing, S. K.;Chen, C. J.;Dong, C. L.;Kong, X. T.;Govorov, A. O.;Liu, R. S.;Wu, N. |
关键词: | hot carriers;photocatalysis;photovoltaics;plasmonics;X-ray absorption |
日期: | 2018-08-26 |
上传时间: | 2018-11-08 12:11:25 (UTC+8) |
摘要: | For semiconductors photosensitized with organic dyes or quantum dots, transferred electrons are usually considered thermalized at the conduction band edge. This study suggests that the electrons injected from a plasmonic metal into a thin semiconductor shell can be nonthermal with energy up to the plasmon frequency. In other words, the electrons injected into the semiconductor are still hot carriers. Photomodulated X-ray absorption measurements of the Ti L2,3 edge are compared before and after excitation of the plasmon in Au@TiO2 core–shell nanoparticles. Comparison with theoretical predictions of the X-ray absorption, which include the heating and state-filling effects from injected hot carriers, suggests that the electrons transferred from the plasmon remain nonthermal in the ∼10 nm TiO2 shell, due in part to a slow trapping in defect states. By repeating the measurements for spherical, rod-like, and star-like metal nanoparticles, the magnitude of the nonthermal distribution, peak energy, and number of injected hot electrons are confirmed to be tuned by the plasmon frequency and the sharp corners of the plasmonic nanostructure. The results suggest that plasmonic photosensitizers can not only extend the sunlight absorption spectral range of semiconductor-based devices but could also result in increased open circuit voltages and elevated thermodynamic driving forces for solar fuel generation in photoelectrochemical cells. |
關聯: | ACS Nanos 12(7), p.7117-7126 |
DOI: | 10.1021/acsnano.8b02939 |
显示于类别: | [物理學系暨研究所] 期刊論文
|
文件中的档案:
档案 |
描述 |
大小 | 格式 | 浏览次数 |
index.html | | 0Kb | HTML | 181 | 检视/开启 | Tunable Nonthermal Distribution of Hot Electrons in a Semiconductor Injected from a Plasmonic Gold Nanostructure.pdf | | 3840Kb | Adobe PDF | 1 | 检视/开启 |
|
在機構典藏中所有的数据项都受到原著作权保护.
|