| Autor: |
Joonhyung Lim, I-Ya Chang, Dongsun Choi, Kim Hyeon-Deuk, Kwang Seob Jeong, Minhaeng Cho, Yun Chang Choi, Kyungwon Kwak |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Matter. 4:1072-1086 |
| ISSN: |
2590-2385 |
| DOI: |
10.1016/j.matt.2020.12.026 |
| Popis: |
Summary Investigating the separate dynamics of electrons and holes has been challenging, although it is critical for the fundamental understanding of semiconducting nanomaterials. n-Type self-doped colloidal quantum dots (CQDs) with excess electrons occupying the low-lying state in the conduction band (CB) have attracted a great deal of attention because of not only their potential applications to infrared optoelectronics but also their intrinsic system that offers a platform for investigating electron dynamics without elusive contributions from holes in the valence band. Here, we show an unprecedented ultrafast intraband Auger process, electron relaxation between spin-orbit coupling states, and exciton-to-ligand vibrational energy transfer process that all occur exclusively in the CB of the self-doped β-HgS CQDs. The electron dynamics obtained by femtosecond mid-infrared spectroscopy will pave the way for further understanding of the blinking phenomenon, disproportionate charging in light-emitting diodes, and hot electron dynamics in higher quantum states coupled to surface states of CQDs. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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