Charge Transport between Coupling Colloidal Perovskite Quantum Dots Assisted by Functional Conjugated Ligands

2018 ◽  
Vol 57 (20) ◽  
pp. 5754-5758 ◽  
Author(s):  
Jinfei Dai ◽  
Jun Xi ◽  
Lu Li ◽  
JingFeng Zhao ◽  
Yifei Shi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transport ◽  
Perovskite Quantum Dots

scholarly journals Contrasting Electron and Hole Transfer Dynamics from CH(NH2)2PbI3 Perovskite Quantum Dots to Charge Transport Layers

2020 ◽  
Vol 10 (16) ◽  
pp. 5553
Author(s):  
Zhigang Lou ◽  
Shuyan Liang ◽  
Jiabei Yuan ◽  
Kang Ji ◽  
Jianyu Yuan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transport ◽  
Transient Absorption ◽  
Diffusion Length ◽  
Temporal Evolution ◽  
Fine Tuning ◽  
Transient Absorption Spectroscopy ◽  
Hole Transfer ◽  
Perovskite Quantum Dots ◽  
Hole Diffusion Length

In this work, the ultrafast transient absorption spectroscopy (TAs) was utilized to first investigate the charge transfer from the emerging FAPbI3 (FA = CH(NH2)2) perovskite quantum dots (PQDs) to charge transport layers. Specifically, we compared the TAs in pure FAPbI3 PQDs, PQDs grown with both electron and hole transfer layers (ETL and HTL), and PQDs with only ETL or HTL. The TA signals induced by photoexcited electrons decay much faster in PQDs samples with the ETL (~20 ps) compared to the pure FAPbI3 PQDs (>1 ns). These results reveal that electrons can effectively transport between coupled PQDs and transfer to the ETL (TiO2) at a time scale of 20 ps, much faster than the bimolecular charge recombination inside the PQDs (>1 ns), and the electron transfer efficiency is estimated to be close to 100%. In contrast, the temporal evolution of the TA signals in the PQDs with and without HTL exhibit negligible change, and no substantive hole transfer to the HTL (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine], PTAA) occurs within 1 ns. The much slower hole transfer implies the further potential of increasing the overall photo-carrier conversion efficiency through enhancing the hole diffusion length and fine-tuning the coupling between the HTL and PQDs.

Charge Transport between Coupling Colloidal Perovskite Quantum Dots Assisted by Functional Conjugated Ligands

2018 ◽  
Vol 130 (20) ◽  
pp. 5856-5860 ◽  
Author(s):  
Jinfei Dai ◽  
Jun Xi ◽  
Lu Li ◽  
JingFeng Zhao ◽  
Yifei Shi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transport ◽  
Perovskite Quantum Dots

scholarly journals In Situ Spectroelectrochemical Investigation of Perovskite Quantum Dots for Tracking Their Transformation

2021 ◽  
Vol 8 ◽  
Author(s):  
ChaeHyun Lee ◽  
Kyoungsoo Kim ◽  
YeJi Shin ◽  
Donghoon Han ◽  
Seog Joon Yoon
Keyword(s):  
Quantum Dots ◽  
Charge Transport ◽  
Precursor State ◽  
Light Emitting ◽  
Mediated Electrochemical Oxidation ◽  
Perovskite Quantum Dots ◽  
Application Potential ◽  
Photoinduced Charge ◽  
Lead Halide

All-inorganic lead-halide perovskite quantum dots (PQDs) (CsPbX3, where X is Cl, Br, or I) have been used successfully in optoelectronic applications, such as solar cells, light-emitting diodes, photocatalysts, and lasers. These PQDs work under electrochemical bias and/or illumination with charge separation/collection by interacting with the charge-transport medium. In this study, we discuss the spectroelectrochemical characteristics of PQDs to understand the oxidation and reduction processes that occur during photoinduced charge transport or charge injection under electrochemical conditions. We also found that the PQDs underwent irreversible transformation to the precursor state of plumbate complexes under electrochemical conditions. Furthermore, in situ spectroelectrochemical analysis demonstrated that hole-mediated electrochemical oxidation of PQDs resulted in their irreversible transformation. Finally, the results presented herein contribute to our understanding of the charge-transfer-mediated process in PQDs and enhance their application potential in optoelectronic devices.

Perovskite Quantum Dots: Opportunities and Challenges

2020 ◽  
Vol 41 (8) ◽  
pp. 940-944
Author(s):  
ZENG Hai-bo ◽  
◽  
DONG Yu-hui ◽  
Keyword(s):  
Quantum Dots ◽  
Perovskite Quantum Dots

Annealing-Induced Morphological Changes in Nanocrystalline Quantum Dots and Their Impact on Charge Transport Properties

2011 ◽  
Vol 41 (3) ◽  
pp. 524-529 ◽  
Author(s):  
Sushmita Biswas ◽  
David J. Gosztola ◽  
Gary P. Wiederrecht ◽  
Michael A. Stroscio ◽  
Mitra Dutta
Keyword(s):  
Quantum Dots ◽  
Charge Transport ◽  
Transport Properties ◽  
Morphological Changes

scholarly journals Achieving Optical Gain of the CsPbBr3 Perovskite Quantum Dots and Influence of the Variable Stripe Length Method

ACS Omega ◽  
2021 ◽  
Author(s):  
Saif M. H. Qaid ◽  
Hamid M. Ghaithan ◽  
Bandar Ali Al-Asbahi ◽  
Abdullah S. Aldwayyan
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Perovskite Quantum Dots ◽  
Stripe Length

Armor-Like Passivated CsPbBr3 Quantum Dots: Boosted Stability with Hand-in-Hand Ligands and Enhanced Performance of Nuclear Battery

2021 ◽  
Author(s):  
Haibo Zeng ◽  
Dandan Yang ◽  
Zhiheng Xu ◽  
Chunhui Gong ◽  
Xiaoming Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Inorganic Perovskite ◽  
Surface Ligands ◽  
Perovskite Quantum Dots ◽  
Stability Issue ◽  
The Stability ◽  
Nuclear Battery ◽  
Cspbbr3 Quantum Dots

One of the main reasons for the stability issue of inorganic perovskite quantum dots (PQDs) is the fragile protection of surface ligands. Here, an armor-like passivation strategy is proposed to...

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