Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection

2019 ◽  
Vol 2 (3) ◽  
pp. 1631-1636 ◽  
Author(s):  
Shihab B. Hafiz ◽  
Michael R. Scimeca ◽  
Peter Zhao ◽  
Ingrid J. Paredes ◽  
Ayaskanta Sahu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Silver Selenide ◽  
Infrared Photodetection

Manganese doped eco-friendly CuInSe2 colloidal quantum dots for boosting near-infrared photodetection performance

2021 ◽  
Vol 403 ◽  
pp. 126452
Author(s):  
Ruiqi Guo ◽  
Jie Meng ◽  
Weihua Lin ◽  
Aqiang Liu ◽  
Tönu Pullerits ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Colloidal Quantum Dots ◽  
Infrared Photodetection

scholarly journals Sub-nanosecond Infrared Photodetection using III-V Colloidal Quantum Dots

2020 ◽  
Author(s):  
Bin Sun ◽  
Amin morteza najarian ◽  
Chao Zheng ◽  
Laxmi Sagar ◽  
Min-Jae Choi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Mobility ◽  
Colloidal Quantum Dots ◽  
Covalent Character ◽  
High Permittivity ◽  
Tunable Bandgap ◽  
Ligand Coordination ◽  
Heavy Doping ◽  
Infrared Photodetection ◽  
Low Permittivity

Abstract Colloidal quantum dots (CQDs) are promising materials for IR light detection due to their tunable bandgap and solution processing; but to date, the time response of CQD IR photodiodes has been inferior to that provided by Si and InGaAs. We reasoned that the high permittivity of II-VI CQDs leads to slow charge extraction due to screening and capacitance; whereas III-Vs – if their surface chemistry could be mastered – offer a strong covalent character for low permittivity and fast operation. In initial studies, we found that existing covalent character led to imbalanced charge transport in InAs, the result of unpassivated surfaces and uncontrolled heavy doping. We report surface management using amphoteric ligand coordination and find that it addresses simultaneously the In and As surface dangling bonds. The new InAs CQD solids combine high mobility (0.04 cm2 V-1 s-1) with a 4x reduction in permittivity compared to PbS CQDs. The resulting photodiodes achieve a response time faster than 300 ps – a more than 100x improvement compared to the best previously-reported CQD photodiodes – combined with an external quantum efficiency (EQE) of 30% at 940 nm.

Near-infrared photodetection based on PbS colloidal quantum dots/organic hole conductor

2010 ◽  
Vol 11 (4) ◽  
pp. 696-699 ◽  
Author(s):  
Sang Hyuk Im ◽  
Jeong Ah Chang ◽  
Sung Woo Kim ◽  
Sang-Wook Kim ◽  
Sang Il Seok
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Colloidal Quantum Dots ◽  
Infrared Photodetection

Surface Organic Ligands-Passivated Quantum Dots: Toward High-Performance Light-Emitting Diodes with Long Lifetime

2021 ◽  
Author(s):  
Lishuang Wang ◽  
Ying Lv ◽  
Jie Lin ◽  
Jialong Zhao ◽  
Xingyuan Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Ligands ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Light Emitting ◽  
Long Lifetime

For quantum dots light-emitting diodes (QLEDs), typical colloidal quantum dots (QDs) are usually composed of a core/shell heterostructure which is covered with organic ligands as surface passivated materials to confine...

scholarly journals Introduction to special issue: Colloidal quantum dots

2020 ◽  
Vol 153 (24) ◽  
pp. 240401
Author(s):  
Matthew C. Beard ◽  
Xiaogang Peng ◽  
Zeger Hens ◽  
Emily A. Weiss
Keyword(s):  
Quantum Dots ◽  
Colloidal Quantum Dots ◽  
Special Issue
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