نتایج جستجو برای: colloidal quantum dot

تعداد نتایج: 325560  

Journal: :ACS applied materials & interfaces 2016
Shilpa N Raja Yehonadav Bekenstein Matthew A Koc Stefan Fischer Dandan Zhang Liwei Lin Robert O Ritchie Peidong Yang A Paul Alivisatos

Lead halide perovskites hold promise for photonic devices, due to their superior optoelectronic properties. However, their use is limited by poor stability and toxicity. We demonstrate enhanced water and light stability of high-surface-area colloidal perovskite nanocrystals by encapsulation of colloidal CsPbBr3 quantum dots into matched hydrophobic macroscale polymeric matrices. This is achieve...

In this paper, the nonlinear rate equations governing a quantum dot laser isused to simulate the transient as well as the steady-state behaviors of the laser.Computation results show that the rate equations are capable of simulating true behaviorof a quantum dot laser. Then, the pump rates of the rate equations (which show indirectelectrical pumping of the quantum dots through a wetting layer) ...

2017
F Pelayo García de Arquer Xiwen Gong Randy P Sabatini Min Liu Gi-Hwan Kim Brandon R Sutherland Oleksandr Voznyy Jixian Xu Yuangjie Pang Sjoerd Hoogland David Sinton Edward Sargent

Quantum dot and well architectures are attractive for infrared optoelectronics, and have led to the realization of compelling light sensors. However, they require well-defined passivated interfaces and rapid charge transport, and this has restricted their efficient implementation to costly vacuum-epitaxially grown semiconductors. Here we report solution-processed, sensitive infrared field-emiss...

آرش فیروزنیا, , سعیده رمضانی ثانی, , عبدالله مرتضی علی, , محمدرضا سرکرده‌ای, ,

In this paper we study the integer quantum Hall effect (IQHE) on the systems with different types of impurities in delta and gaussian forms. The Landau energy levels in the presence of impurity split in two different levels,the extended and localized levels, emerging then the Hall step. Finally, we add a specified form of a quantum dot potential to a system with impurity, and observed that incr...

2012
Jun Wang Danny Vennerberg Zhiqun Lin

In response to rapidly increasing global energy demand, the development of alternative energy sources to fossil fuels has emerged as one of the most urgent technological challenges. Solar energy, which represents a nearly unlimited source of clean power, has been considered as one of the most promising new energy sources. In addition to the current success of silicon based solar cells, quantum ...

Journal: :Chemical communications 2011
Ho Jin Jutaek Nam Joonhyuck Park Sungho Jung Kyuhyun Im Jaehyun Hur Jong-Jin Park Jong-Min Kim Sungjee Kim

A series of quantum dot (QD) ligands are reported that can make strong polyelectrolyte QD surfaces with sulfonates or quaternary ammoniums, which can endow QDs with excellent colloidal stability independent of the pH and ionic strength, minimal hydrodynamic size, and can be exploited to achieve stable and flexible bioconjugations and layer-by-layer assembly.

Journal: :Advanced materials 2016
Mengxia Liu F Pelayo García de Arquer Yiying Li Xinzheng Lan Gi-Hwan Kim Oleksandr Voznyy Lethy Krishnan Jagadamma Abdullah Saud Abbas Sjoerd Hoogland Zhenghong Lu Jin Young Kim Aram Amassian Edward H Sargent

The latest advances in colloidal-quantum-dot material processing are combined with a double-sided junction architecture, which is done by efficiently incorporating indium ions in the ZnO eletrode. This platform allows the collection of all photogenerated carriers even at the maximum power point. The increased depletion width in the device facilitates full carrier collection, leading to a record...

2016
Andrea De Iacovo Carlo Venettacci Lorenzo Colace Leonardo Scopa Sabrina Foglia

Colloidal quantum dots have recently attracted lot of interest in the fabrication of optoelectronic devices due to their unique optical properties and their simple and low cost fabrication. PbS nanocrystals emerged as the most advanced colloidal material for near infrared photodetectors. In this work we report on the fabrication and characterization of PbS colloidal quantum dot photoconductors....

2008
J. M. CARUGE J. E. HALPERT M. G. BAWENDI

Colloidal quantum dots, with their tunable luminescence properties, are uniquely suited for use as lumophores in lightemitting devices for display technologies and large-area planar lighting. In contrast to epitaxially grown quantum dots, colloidal quantum dots can be synthesized as highly monodisperse colloids and solution deposited over large areas into densely packed, solid-state multilayers...

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