Synergistic ligand exchange and UV curing of PbS quantum dots for effective surface passivation

Nanoscale ◽  
2019 ◽  
Vol 11 (47) ◽  
pp. 22832-22840 ◽  
Author(s):  
Hadi Tavakoli Dastjerdi ◽  
Daniel Prochowicz ◽  
Pankaj Yadav ◽  
Mohammad Mahdi Tavakoli
Keyword(s):  
Ligand Exchange ◽  
Surface Passivation ◽  
Exchange Process ◽  
Uv Curing ◽  
Nonradiative Recombination ◽  
Trap States ◽  
Effective Surface ◽  
Surface Trap ◽  
Effective Suppression ◽  
Pbs Quantum Dots

UV curing of PbS QDs during ligand exchange process leads to effective suppression of surface trap states and reduced nonradiative recombination.

Surface Passivation of Luminescent Colloidal Quantum Dots with Poly(Dimethylaminoethyl methacrylate) through a Ligand Exchange Process

2004 ◽  
Vol 126 (25) ◽  
pp. 7784-7785 ◽  
Author(s):  
Xiao-Song Wang ◽  
Tieneke E. Dykstra ◽  
Mayrose R. Salvador ◽  
Ian Manners ◽  
Gregory D. Scholes ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
Surface Passivation ◽  
Exchange Process ◽  
Colloidal Quantum Dots ◽  
Dimethylaminoethyl Methacrylate

Hybrid perovskite exchange of PbS quantum dots for fast and high-detectivity visible–near-infrared photodetectors

2020 ◽  
Vol 8 (23) ◽  
pp. 7812-7819
Author(s):  
Longfei Mi ◽  
Yajing Chang ◽  
Yan Zhang ◽  
Enze Xu ◽  
Yang Jiang
Keyword(s):  
Quantum Dots ◽  
Ligand Exchange ◽  
High Performance ◽  
Near Infrared ◽  
Exchange Process ◽  
Infrared Photodetectors ◽  
Hybrid Perovskite ◽  
Pbs Quantum Dots

A hybrid perovskite decorated with PbS-QDs by using a ligand exchange process to fabricate high-performance photodetectors.

The Enhancement of Band Edge Emission from ZnS/Zn(OH)2 Quantum Dots

2000 ◽  
Vol 642 ◽  
Author(s):  
Hatim Mohamed El-Khair ◽  
Ling Xu ◽  
Xinfan Huang ◽  
Minghai Li ◽  
Xiaofeng Gu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Band Edge ◽  
Band Edge Emission ◽  
Trap States ◽  
Edge Emission ◽  
Surface Trap ◽  
Quantum Size ◽  
Transmission Electron

ABSTRACTWurtzite structure monodisperse ZnS quantum dots (QDs) of 1 to 5 nm diameter, synthesized by colloidal chemical method, were confirmed by transmission electron microscopy (TEM) images and electron diffraction (ED) patterns. Enhanced blue shifted band edge emission from Zn(OH)2 capped ZnS QDs with decreasing size has been observed, which indicates the role of inorganic surface passivation and hence supports the quantum size effect. Detectable far-red shifted emission from bare ZnS QDs has been observed when QDs precursors and stabilizer dispersed in solvents with different polarities. This emission is attributed to the surface trap states of different energies.

Facet-Dependent Surface Trap States and Carrier Lifetimes of Silicon

Nano Letters ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 1952-1958 ◽  
Author(s):  
Chih-Shan Tan ◽  
Yicheng Zhao ◽  
Rong-Hao Guo ◽  
Wei-Tsung Chuang ◽  
Lih-Juann Chen ◽  
...  
Keyword(s):  
Trap States ◽  
Surface Trap ◽  
Carrier Lifetimes

Al2O3/SiON stack layers for effective surface passivation and anti-reflection of high efficiency n-type c-Si solar cells

2017 ◽  
Vol 32 (2) ◽  
pp. 025005 ◽  
Author(s):  
Huong Thi Thanh Nguyen ◽  
Nagarajan Balaji ◽  
Cheolmin Park ◽  
Nguyen Minh Triet ◽  
Anh Huy Tuan Le ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Effective Surface ◽  
Si Solar Cells ◽  
Type C

scholarly journals Recent Research Progress in Surface Ligand Exchange of PbS Quantum Dots for Solar Cell Application

2020 ◽  
Vol 10 (3) ◽  
pp. 975 ◽  
Author(s):  
Hyung Ryul You ◽  
Jin Young Park ◽  
Duck Hoon Lee ◽  
Younghoon Kim ◽  
Jongmin Choi
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Ligand Exchange ◽  
Exchange Process ◽  
Surface States ◽  
Solution Phase ◽  
Research Progress ◽  
Solar Cell Application ◽  
Exchange Processes ◽  
Particle Size And Shape

Colloidal quantum dots (CQDs) are considered as next-generation semiconductors owing to their tunable optical and electrical properties depending on their particle size and shape. The characteristics of CQDs are mainly governed by their surface chemistry, and the ligand exchange process plays a crucial role in determining their surface states. Worldwide studies toward the realization of high-quality quantum dots have led to advances in ligand exchange methods, and these procedures are usually carried out in either solid-state or solution-phase. In this article, we review recent advances in solid-state and solution-phase ligand exchange processes that enhance the performance and stability of lead sulfide (PbS) CQD solar cells, including infrared (IR) CQD photovoltaics.

scholarly journals Ligand-Length Modification in CsPbBr3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1297 ◽  
Author(s):  
Juan Navarro Arenas ◽  
Ananthakumar Soosaimanickam ◽  
Hamid Pashaei Adl ◽  
Rafael Abargues ◽  
Pablo P. Boix ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Optical Sensors ◽  
Ligand Exchange ◽  
Near Infrared ◽  
Future Internet ◽  
Single Step ◽  
Perovskite Nanocrystals ◽  
Internet Of Things Technology ◽  
Pbs Quantum Dots

Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, via solid state ligand-exchange using 3-mercaptopropionic acid (MPA). The electrical and electro-optical properties of photovoltaic and photoconductor devices were improved after the MPA ligand exchange, mainly because of a mobility increase up to 5 × 10−3 cm 2 / Vs . The same technology was developed to build a tandem photovoltaic device based on a bilayer of PbS quantum dots (QDs) and CsPbBr3 perovskite nanocrystals. Here, the ligand exchange was successfully carried out in a single step after the deposition of these two layers. The photodetector device showed responsivities around 40 and 20 mA/W at visible and near infrared wavelengths, respectively. This strategy can be of interest for future visible-NIR cameras, optical sensors, or receivers in photonic devices for future Internet-of-Things technology.

scholarly journals Energetics of Nonradiative Surface Trap States in Nanoparticles Monitored by Time-of-Flight Photoconduction Measurements on Nanoparticle–Polymer Blends

2019 ◽  
Vol 11 (40) ◽  
pp. 37184-37192
Author(s):  
Xiaoqing Guo ◽  
Qianxun Gong ◽  
Joanna Borowiec ◽  
Sijie Zhang ◽  
Shuo Han ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Time Of Flight ◽  
Trap States ◽  
Surface Trap

Highly Effective Surface Passivation of PbSe Quantum Dots through Reaction with Molecular Chlorine

2012 ◽  
Vol 134 (49) ◽  
pp. 20160-20168 ◽  
Author(s):  
Wan Ki Bae ◽  
Jin Joo ◽  
Lazaro A. Padilha ◽  
Jonghan Won ◽  
Doh C. Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Molecular Chlorine ◽  
Effective Surface ◽  
Highly Effective
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