Charging States of Si Quantum Dots as Detected by AFM/Kelvin Probe Technique

Shimizu, Naoji; Ikeda, Mitsuhisa; Yoshida, Eisaku; Miyazaki, Seiichi; Hirose, Masataka

doi:10.7567/ssdm.1999.d-2-3

Extended Abstracts of the 1999 International Conference on Solid State Devices and Materials 1999

DOI: 10.7567/ssdm.1999.d-2-3

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Charging States of Si Quantum Dots as Detected by AFM/Kelvin Probe Technique

Naoji Shimizu¹,

Mitsuhisa Ikeda²,

Eisaku Yoshida³

et al.

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2021

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“…Nevertheless, this stimulus failed to brighten the quenched PL on metallic surfaces in previous attempts. 19,20 This is because a weak DC field is insufficient to overcome the potential barrier between the QDs and the conductive surfaces, and thus is unable to discharge the nanocrystals. On the other hand, a high DC field would likely cause dielectric breakdown before the QDs were sufficiently discharged.…”

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confidence: 99%

Terahertz Field-Induced Reemergence of Quenched Photoluminescence in Quantum Dots

Shi,

Gao,

Zhang

et al. 2021

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Continuous and concerted development of colloidal quantum-dot light-emitting diodes over the past two decades has established them as a bedrock technology for the next generation of displays. However, a fundamental issue that limits the performance of these devices is the quenching of photoluminescence due to excess charges from conductive charge transport layers. Although device designs have leveraged various workarounds, doing so often comes at the cost of limiting efficient charge injection. Here we demonstrate that high-field terahertz (THz) pulses can dramatically brighten quenched QDs on metallic surfaces, an effect which persists for minutes after THz irradiation. This phenomenon is attributed to the ability of the THz field to remove excess charges, thereby reducing trion and non-radiative Auger recombination. Our findings show that THz technologies can be used to suppress and control such undesired non-radiative decay, potentially in a variety of luminescent materials for future device applications.

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mentioning

confidence: 99%

Terahertz Field-Induced Reemergence of Quenched Photoluminescence in Quantum Dots

Shi,

Gao,

Zhang

et al. 2021

Preprint

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Charging States of Si Quantum Dots as Detected by AFM/Kelvin Probe Technique

Cited by 1 publication

References 0 publications

Terahertz Field-Induced Reemergence of Quenched Photoluminescence in Quantum Dots

Terahertz Field-Induced Reemergence of Quenched Photoluminescence in Quantum Dots

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