High resolution patterning of PbS quantum dots/graphene photodetectors with high responsivity via photolithography with a top graphene layer to protect surface ligands

2021 ◽  
Author(s):  
Seungbae Ahn ◽  
Wenjun Chen ◽  
Oscar Vazquez-Mena
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
Graphene Layer ◽  
Dry Etching ◽  
Surface Ligands ◽  
High Responsivity ◽  
Lithography Process ◽  
Pbs Quantum Dots

We use a top-graphene layer to protect QD surface ligands during the lithography process, allowing reliable patterning of hybrid Gr/QD photodetectors via lithography and dry etching.

Zn-doping enhances the photoluminescence and stability of PbS quantum dots for in vivo high-resolution imaging in the NIR-II window

Nano Research ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2239-2245 ◽  
Author(s):  
Xiulei Shi ◽  
Song Chen ◽  
Meng-Yao Luo ◽  
Biao Huang ◽  
Guozhen Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
High Resolution Imaging ◽  
Zn Doping ◽  
Resolution Imaging ◽  
Pbs Quantum Dots

scholarly journals Air-stable PbS quantum dots synthesized with slow reaction kinetics via a PbBr2 precursor

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68579-68586 ◽  
Author(s):  
Lin Yuan ◽  
Robert Patterson ◽  
Wenkai Cao ◽  
Zewen Zhang ◽  
Zhilong Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
Quantum Dot ◽  
Reaction Kinetics ◽  
Slow Reaction ◽  
Pbs Quantum Dots ◽  
Pbs Quantum Dot

High resolution of EDX image shows the bromine located on same position of PbS quantum dot.

PbS-quantum-dots/double-wall-carbon-nanotubes nanohybrid based photodetectors with extremely fast response and high responsivity

2020 ◽  
Vol 16 ◽  
pp. 100378 ◽  
Author(s):  
Ibrahima Ka ◽  
Vincent Le Borgne ◽  
Kazunori Fujisawa ◽  
Takuya Hayashi ◽  
Yoong Ahm Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Fast Response ◽  
High Responsivity ◽  
Pbs Quantum Dots ◽  
Double Wall

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

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...

Polymer-Assisted High-Resolution Printing Techniques for Colloidal Quantum Dots

2021 ◽  
Vol 29 (6) ◽  
pp. 391-401
Author(s):  
Jiwoong Yang ◽  
Jisu Yoo ◽  
Won Seok Yu ◽  
Moon Kee Choi
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
Colloidal Quantum Dots ◽  
Printing Techniques

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.

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