scholarly journals Dynamic Ligand Surface Chemistry of Excited PbS Quantum Dots

2020 ◽  
Vol 11 (6) ◽  
pp. 2291-2297 ◽  
Author(s):  
Eric R. Kennehan ◽  
Kyle T. Munson ◽  
Grayson S. Doucette ◽  
Ashley R. Marshall ◽  
Matthew C. Beard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Pbs Quantum Dots

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 Embedding PbS Quantum Dots (QDs) in Pb-Halide Perovskite Matrices: QD Surface Chemistry and Antisolvent Effects on QD Dispersion and Confinement Properties

2020 ◽  
Vol 2 (11) ◽  
pp. 1464-1472
Author(s):  
E. Ashley Gaulding ◽  
Xihan Chen ◽  
Ye Yang ◽  
Steven P. Harvey ◽  
Bobby To ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Halide Perovskite ◽  
Pbs Quantum Dots

Size-Tunable, Bright, and Stable PbS Quantum Dots: A Surface Chemistry Study

ACS Nano ◽  
2011 ◽  
Vol 5 (3) ◽  
pp. 2004-2012 ◽  
Author(s):  
Iwan Moreels ◽  
Yolanda Justo ◽  
Bram De Geyter ◽  
Katrien Haustraete ◽  
José C. Martins ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Pbs Quantum Dots

Surface chemistry of as-synthesized and air-oxidized PbS quantum dots

2018 ◽  
Vol 457 ◽  
pp. 1-10 ◽  
Author(s):  
Hossein Beygi ◽  
Seyed Abdolkarim Sajjadi ◽  
Abolfazl Babakhani ◽  
Jeff F. Young ◽  
Frank C.J.M. van Veggel
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Pbs Quantum Dots

Surface chemistry of arenethiolate-capped PbS quantum dots and application as colloidally stable photovoltaic ink

2014 ◽  
Vol 560 ◽  
pp. 2-9 ◽  
Author(s):  
Carlo Giansante ◽  
Luigi Carbone ◽  
Cinzia Giannini ◽  
Davide Altamura ◽  
Zoobia Ameer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Pbs Quantum Dots

Synergistic Effect Between Halide Perovskites and PbS Quantum Dots

2020 ◽  
Author(s):  
Iván Mora-Seró ◽  
Sofia Masi ◽  
David Macias-Pinilla ◽  
Carlos Echeverría-Arrondo ◽  
Juan Ignacio Climente
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
Halide Perovskites ◽  
Pbs Quantum Dots

scholarly journals A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Tamara Sloboda ◽  
Sebastian Svanström ◽  
Fredrik O. L. Johansson ◽  
Aneta Andruszkiewicz ◽  
Xiaoliang Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Injection ◽  
Core Level ◽  
Pump Laser ◽  
Repetition Frequency ◽  
Specific Information ◽  
Single Experiment ◽  
Time Resolved ◽  
X Ray ◽  
Pbs Quantum Dots

AbstractTime-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in a single experiment carried out at the synchrotron facility BESSY II. The method is sensitive to small changes in core level positions. Fast measurements at low pump fluences are enabled by the use of a pump laser at a lower repetition frequency than the repetition frequency of the X-ray pulses used to probe the core level electrons: Through the use of a time-resolved spectrometer, time-dependent analysis of data from all synchrotron pulses is possible. Furthermore, by picosecond control of the pump laser arrival at the sample relative to the X-ray pulses, a time-resolution limited only by the length of the X-ray pulses is achieved. Using this method, we studied the charge dynamics in thin film samples of PbS quantum dots on n-type MgZnO substrates through time-resolved measurements of the Pb 5d core level. We found a time-resolved core level shift, which we could assign to electron injection and charge accumulation at the MgZnO/PbS quantum dots interface. This assignment was confirmed through the measurement of PbS films with different thicknesses. Our results therefore give insight into the magnitude of the photovoltage generated specifically at the MgZnO/PbS interface and into the timescale of charge transport and electron injection, as well as into the timescale of charge recombination at this interface. It is a unique feature of our method that the timescale of both these processes can be accessed in a single experiment and investigated for a specific interface.

Temperature-induced PbS quantum dots with tunable broadband wavelength grown by atomic layer deposition

2021 ◽  
Vol 546 ◽  
pp. 149086
Author(s):  
Xiangping Pan ◽  
Yanhua Dong ◽  
Ming Jia ◽  
Jianxiang Wen ◽  
Caiyun Su ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Pbs Quantum Dots

scholarly journals Colloidal PbS quantum dots for visible-to-near-infrared optical-internet-of-things

2021 ◽  
pp. 1-1
Author(s):  
Aigerim Tankimanova ◽  
Chun Hong Kang ◽  
Omar Alkhazragi ◽  
Haodong Tang ◽  
Meiwei Kong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Internet Of Things ◽  
Near Infrared ◽  
Optical Internet ◽  
Pbs Quantum Dots
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