Ultrafast Interfacial Electron and Hole Transfer from CsPbBr3 Perovskite Quantum Dots

2015 ◽  
Vol 137 (40) ◽  
pp. 12792-12795 ◽  
Author(s):  
Kaifeng Wu ◽  
Guijie Liang ◽  
Qiongyi Shang ◽  
Yueping Ren ◽  
Degui Kong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hole Transfer ◽  
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.

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

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...

Ultra-stable water-dispersive perovskite QDs encapsulated by triple siloxane coupling agent system with different hydrophilic/ hydrophobic properties

2021 ◽  
Author(s):  
Bingfeng Shi ◽  
Jianhua Lv ◽  
Ying Liu ◽  
Yang Xiao ◽  
Changli Lü
Keyword(s):  
Quantum Dots ◽  
Coupling Agent ◽  
Polar Solvent ◽  
Hydrophobic Properties ◽  
Agent System ◽  
Environmental Tolerance ◽  
Perovskite Quantum Dots ◽  
Improve Stability

Driven by the instability of perovskite quantum dots (PQDs), different encapsulation techniques are used to improve stability of PQDs. However, further improvements in the extreme environmental tolerance and polar solvent...

Investigation of the Surface Passivation Effect on the Optical Properties of CsPbBr3 Perovskite Quantum Dots

2021 ◽  
Vol 23 ◽  
pp. 100948
Author(s):  
Saif M.H. Qaid ◽  
Hamid M. Ghaithan ◽  
Bandar Ali Al-Asbahi ◽  
Abdullah S. Aldwayyan
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Passivation ◽  
Perovskite Quantum Dots

Highly Emissive Deep‐Red Perovskite Quantum Dots in Glass: Photoinduced Thermal Engineering and Applications

2021 ◽  
pp. 2100094
Author(s):  
Ke Sun ◽  
Dezhi Tan ◽  
Juan Song ◽  
Weidong Xiang ◽  
Beibei Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Thermal Engineering ◽  
Perovskite Quantum Dots
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