期刊
ACS NANO
卷 14, 期 6, 页码 7237-7244出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c02402
关键词
electron spin coherence; charge separation; carrier trapping; ultrafast transient spectroscopy; nanoplatelets
类别
资金
- National Key Research and Development Program of China [2018YFA0306303]
- Deutsche Forschungsgemeinschaft [ICRC TRR 160]
- National Natural Science Foundation of China [91950112, 11727810, 61720106009]
- Science & Technology Commission of Shanghai Municipality [19ZR1414500]
We investigate the charge separation dynamics provided by carrier surface trapping in CdSe/CdS core/shell nanoplatelets by means of a three-laser-beam pump-orientation-probe technique, detecting the electron spin coherence at room temperature. Signals with two Larmor precession frequencies are found, which strongly differ in their dynamical characteristics and dependencies on pump power and shell thickness. The electron trapping process occurs on a time scale of about 10 ns, and the charge separation induced thereby has a long lifetime of up to hundreds of microseconds. On the other hand, the hole trapping requires times from subpicoseconds to hundreds of picoseconds, and the induced charge separation has a lifetime of a few nanoseconds. With increasing CdS shell thickness the hole trapping vanishes, while the electron trapping is still detectable. These findings have important implications for understanding the photophysical processes of nanoplatelets and other colloidal nanostructures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据