Temperature- and ligand-dependent carrier transport dynamics in photovoltaic PbS colloidal quantum dot thin films using diffusion-wave methods

2017 ◽  
Vol 164 ◽  
pp. 135-145 ◽  
Author(s):  
Lilei Hu ◽  
Andreas Mandelis ◽  
Zhenyu Yang ◽  
Xinxin Guo ◽  
Xinzheng Lan ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Carrier Transport ◽  
Diffusion Wave ◽  
Transport Dynamics ◽  
Colloidal Quantum Dot ◽  
Wave Methods

scholarly journals Direct Patterning of Colloidal Quantum-Dot Thin Films for Enhanced and Spectrally Selective Out-Coupling of Emission

Nano Letters ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 1319-1325 ◽  
Author(s):  
Ferry Prins ◽  
David K. Kim ◽  
Jian Cui ◽  
Eva De Leo ◽  
Leo L. Spiegel ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Direct Patterning ◽  
Spectrally Selective ◽  
Colloidal Quantum Dot

scholarly journals Non-Equilibrium Carrier Transport in Strongly Coupled Quantum Dot Solids and Heterostructures

2021 ◽  
Author(s):  
Mengxia Liu ◽  
Sachin Dev Verma ◽  
Zhilong Zhang ◽  
Jooyoung Sung ◽  
Akshay Rao
Keyword(s):  
Quantum Dot ◽  
Carrier Transport ◽  
Transient Absorption ◽  
High Mobility ◽  
Full Potential ◽  
Strongly Coupled ◽  
Transport Length ◽  
Energetic Disorder ◽  
Colloidal Quantum Dot ◽  
Non Equilibrium

Abstract Understanding and controlling carrier dynamics in colloidal quantum dot (CQD) solids is crucial for unlocking their full potential for optoelectronic applications. The recent development of solution-processing methods to incorporate CQDs into high-mobility semiconducting matrices opens new routes to control simultaneously electronic coupling and packing uniformity in CQD solids. However, the fundamental nature of carrier transport in such systems remains elusive. Here we report the direct visualisation of carrier propagation in metal-halide exchanged PbS CQD solids and quantum-dot-in-perovskite (QDiP) heterostructures via transient absorption microscopy. We reveal three distinct transport regimes: an initial band-like transport persisting over hundreds of femtoseconds, an Auger-assisted sub-diffusive transport before thermal equilibrium is achieved, and a final hopping regime at longer times. The band-like transport was observed to correlate strongly with the extent of carrier delocalisation and the degree of energetic disorder. By tailoring the perovskite content in heterostructures, we obtained a band-like transport length of 90 nm at room temperature and an equivalent diffusivity of up to 106 cm2 s-1 – which is four orders of magnitude higher than the steady-state values obtained for PbS CQD solids. These findings not only shed light on the non-equilibrium dynamics in CQD solids and their influence on carrier transport, but also introduce promising strategies to harness non-equilibrium transport phenomena for more efficient optoelectronic devices.

scholarly journals Local Defects in Colloidal Quantum Dot Thin Films Measured via Spatially Resolved Multi‐Modal Optoelectronic Spectroscopy

2020 ◽  
Vol 32 (11) ◽  
pp. 1906602 ◽  
Author(s):  
Yida Lin ◽  
Tina Gao ◽  
Xiaoyun Pan ◽  
Maria Kamenetska ◽  
Susanna M. Thon
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Spatially Resolved ◽  
Colloidal Quantum Dot ◽  
Local Defects

Exciton Lifetime Broadening and Distribution Profiles of PbS Colloidal Quantum Dot Thin Films Using Frequency- and Temperature-Scanned Photocarrier Radiometry

2013 ◽  
Vol 117 (44) ◽  
pp. 23333-23348 ◽  
Author(s):  
Jing Wang ◽  
Andreas Mandelis ◽  
Alexander Melnikov ◽  
Sjoerd Hoogland ◽  
Edward H. Sargent
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Photocarrier Radiometry ◽  
Exciton Lifetime ◽  
Colloidal Quantum Dot

Carrier transport dynamics in Mn-doped CdSe quantum dot sensitized solar cells

2017 ◽  
Vol 28 (41) ◽  
pp. 415401 ◽  
Author(s):  
Uma Poudyal ◽  
Francis S Maloney ◽  
Keshab Sapkota ◽  
Wenyong Wang
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Carrier Transport ◽  
Transport Dynamics ◽  
Cdse Quantum Dot ◽  
Sensitized Solar Cells ◽  
Mn Doped
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