Exciton dynamics probe the energy structure of a quantum dot-in-a-well system: The role of Coulomb attraction and dimensionality

2015 ◽  
Vol 91 (23) ◽  
Author(s):  
Mirco Kolarczik ◽  
Nina Owschimikow ◽  
Bastian Herzog ◽  
Florian Buchholz ◽  
Yücel I. Kaptan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Energy Structure ◽  
Exciton Dynamics ◽  
Coulomb Attraction

scholarly journals Deciphering the role of quantum dot size in the ultrafast charge carrier dynamics at the perovskite–quantum dot interface

2020 ◽  
Vol 8 (42) ◽  
pp. 14834-14844
Author(s):  
Piotr Piatkowski ◽  
Sofia Masi ◽  
Pavel Galar ◽  
Mario Gutiérrez ◽  
Thi Tuyen Ngo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Carrier ◽  
Rate Constants ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Carrier Transfer ◽  
Charge Carrier Dynamics ◽  
Conduction Bands

Charge-carrier transfer (CT) from the perovskite host to PbS QDs were studied using fs-transient absorption and THz techniques. The CT rate constants increase with the size of QDs due to a change in the position of valence and conduction bands in PbS QDs.

The coupling of single-photon exciton–biexciton quantum dot and cavity

2017 ◽  
Vol 26 (03) ◽  
pp. 1750029 ◽  
Author(s):  
Lina Jaya Diguna ◽  
Yudi Darma ◽  
Muhammad Danang Birowosuto
Keyword(s):  
Correlation Function ◽  
Quantum Dot ◽  
Density Matrix ◽  
High Probability ◽  
Single Photon ◽  
Photon Emission ◽  
Emission Properties ◽  
Proposed Model ◽  
Cavity System

We investigate the influence of multiple excitons on the photon emission properties of a quantum dot (QD)-cavity system via the master equation for the density matrix. We show that in the intermediate to strong coupling regimes, the multiple excitons lead to the suppressed QD emissions as well as the absence of anti-crossing near zero detuning, arising from the interaction between the multiple excitons and cavity. Furthermore, we analyze the role of the cavity-biexciton detuning in the photon emission properties of cavity and exciton through the second-order correlation function. The small cavity-biexciton detuning yields the significant Purcell effect and the high probability of single photon emissions. The proposed model offers the fundamental approach in developing efficient single-photon emitting devices.

Concentration and excitation effects on the exciton dynamics of poly(3-hexylthiophene)/PbS quantum dot blend films

2013 ◽  
Vol 24 (23) ◽  
pp. 235707 ◽  
Author(s):  
D Tsokkou ◽  
G Itskos ◽  
S Choulis ◽  
M Yarema ◽  
W Heiss ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Exciton Dynamics ◽  
Blend Films ◽  
Pbs Quantum Dot
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