Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-12558-y
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Funding
- Ministry of Science and Technology of China [2018YFA0208703]
- Strategic Pilot Science and Technology Project of Chinese Academy of Sciences [XDB17010100]
- National Natural Science Foundation of China [21773239, 21803070, 51961165109]
- LiaoNing Revitalization Talents Program [XLYC1807154]
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Hot electrons can dramatically improve the efficiency of solar cells and sensitize energetically-demanding photochemical reactions. Efficient hot electron devices have been hindered by sub-picosecond intraband cooling of hot electrons in typical semiconductors via electron-phonon scattering. Semiconductor quantum dots were predicted to exhibit a phonon bottleneck for hot electron relaxation as their quantum-confined electrons would couple very inefficiently to phonons. However, typical cadmium selenide dots still exhibit sub-picosecond hot electron cooling, bypassing the phonon bottleneck possibly via an Auger-like process whereby the excessive energy of the hot electron is transferred to the hole. Here we demonstrate this cooling mechanism can be suppressed in copper-doped cadmium selenide colloidal quantum dots due to femtosecond hole capturing by copper-dopants. As a result, we observe a lifetime of similar to 8.6 picosecond for 1P(e) hot electrons which is more than 30-fold longer than that in same-sized, undoped dots (similar to 0.25 picosecond).
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