Hot Electrons Generated from Doped Quantum Dots via Upconversion of Excitons to Hot Charge Carriers for Enhanced Photocatalysis

2015 ◽  
Vol 137 (16) ◽  
pp. 5549-5554 ◽  
Author(s):  
Yitong Dong ◽  
Julius Choi ◽  
Hae-Kwon Jeong ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Charge Carriers ◽  
Hot Electrons ◽  
Doped Quantum Dots

Photons and charges from colloidal doped semiconductor quantum dots

2019 ◽  
Vol 7 (47) ◽  
pp. 14788-14797 ◽  
Author(s):  
Tian Qiao ◽  
David Parobek ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Hot Electrons ◽  
Doped Quantum Dots

This work discusses the photophysical pathways in doped quantum dots responsible for generating photons of non-exciton origin and hot electrons.

scholarly journals Spin blockade and phonon bottleneck for hot electron relaxation observed in n-doped colloidal quantum dots

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junhui Wang ◽  
Lifeng Wang ◽  
Shuwen Yu ◽  
Tao Ding ◽  
Dongmei Xiang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Phonon Scattering ◽  
Surface States ◽  
Hot Electrons ◽  
Hot Electron ◽  
Phonon Bottleneck ◽  
Spin Interactions ◽  
Doped Quantum Dots ◽  
Electron Relaxation ◽  
Spin Blockade

AbstractUnderstanding and manipulating hot electron dynamics in semiconductors may enable disruptive energy conversion schemes. Hot electrons in bulk semiconductors usually relax via electron-phonon scattering on a sub-picosecond timescale. Quantum-confined semiconductors such as quantum dots offer a unique platform to prolong hot electron lifetime through their size-tunable electronic structures. Here, we study hot electron relaxation in electron-doped (n-doped) colloidal CdSe quantum dots. For lightly-doped dots we observe a slow 1Pe hot electron relaxation (~10 picosecond) resulting from a Pauli spin blockade of the preoccupying 1Se electron. For heavily-doped dots, a large number of electrons residing in the surface states introduce picosecond Auger recombination which annihilates the valance band hole, allowing us to observe 300-picosecond-long hot electrons as a manifestation of a phonon bottleneck effect. This brings the hot electron energy loss rate to a level of sub-meV per picosecond from a usual level of 1 eV per picosecond. These results offer exciting opportunities of hot electron harvesting by exploiting carrier-carrier, carrier-phonon and spin-spin interactions in doped quantum dots.

Photoemission of Energetic Hot Electrons Produced via Up-Conversion in Doped Quantum Dots

Nano Letters ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 7270-7275 ◽  
Author(s):  
Yitong Dong ◽  
David Parobek ◽  
Daniel Rossi ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Hot Electrons ◽  
Doped Quantum Dots

Nonequilibrium population of charge carriers in structures with InGaN deep quantum dots

2007 ◽  
Vol 41 (5) ◽  
pp. 575-589 ◽  
Author(s):  
D. S. Sizov ◽  
E. E. Zavarin ◽  
N. N. Ledentsov ◽  
V. V. Lundin ◽  
Yu. G. Musikhin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carriers

Colloidal Transition-Metal-Doped Quantum Dots

2010 ◽  
pp. 397-453 ◽  
Author(s):  
R√©mi Beaulac ◽  
Stefan Ochsenbein ◽  
Daniel Gamelin
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Doped Quantum Dots ◽  
Metal Doped
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