Local charge trapping in Ge nanoclustersdetected by Kelvin probe force microscopy

Кондратенко, С. В.; Lysenko, V. S.; Kozyrev, Yu. N.; Kratzer, Markus; Storozhuk, Darina; Iliash, S.A.; Czibula, Caterina; Teichert, Christian

doi:10.1016/j.apsusc.2016.07.148

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…Активну участь у дослідженнях, спрямованих на застосування квантових точок у технології створення тандемних сонячних елементів на основі кремнію з нанокристалітами SiGe, SiC, SiEr та їх похідними, брали академік НАН України Антон Григорович Наумовець (Інститут фізики НАН України) [13], членкореспондент НАН України Володимир Сергійович Лисенко (Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України) та інші вчені [14,15]. Слід також відзначити цикл робіт з дослідження електродинаміки дисперсних систем, який було виконано в Інституті хімії поверхні ім.…”

Section: луїс брус (Louis E Brus)американський фізико-хімік піонер у ...unclassified

Квантові Точки — Основа Сучасного Та Майбутнього Матеріалознавства

Картель,

Лобанов

2023

Visn. Nac. Akad. Nauk Ukr.

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Цьогорічними лауреатами Нобелівської премії з хімії стали троє вчених із США — Мунгі Бавенді (Moungi G. Bawendi) з Массачусетського технологічного інституту, Луїс Брус (Louis E. Brus) із Колумбійського університету та Олексій Єкимов (Aleksey I. Yekimov) з Nanocrystals Technology Inc. — «за відкриття і синтез квантових точок». Як зазначено у пресрелізі Нобелівського комітету, квантові точки настільки дрібні наночастинки, що їхні фізичні властивості більшою мірою визначаються розміром і формою, ніж хімічним складом. «Ці найменші компоненти нанотехнологій тепер поширюють світло від телевізорів та світлодіодних ламп і, серед іншого, допомагають хірургам в операціях з видалення пухлинних тканин».

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Section: луїс брус (Louis E Brus)американський фізико-хімік піонер у ...unclassified

Квантові Точки — Основа Сучасного Та Майбутнього Матеріалознавства

Картель,

Лобанов

2023

Visn. Nac. Akad. Nauk Ukr.

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“…Therefore, so far, only limited research has been focused on the investigation of electrostatic properties of Ge QDs grown by molecular beam epitaxy, which shows only one-dimensional confinement below the Bohr exciton radius of Ge. , Hence, gas-phase Ge NCs represent a desirable three-dimensional (3D) model that enables the study of the properties of free-standing Ge NCs forming 3D confined QDs. In this regard, the routes for synthesizing Ge NCs can be divided into solution-phase methods, such as the sol–gel process, , microwave-assisted reduction, , thermal decomposition, , and gas-phase methods, including nonthermal plasma, and cluster-beam deposition. , The several advantages of the gas-phase method compared to the solution-phase method for synthesizing Ge NCs include environmentally friendly routes, easy size control, and ligand-free NCs.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Growth Kinetics toward a Size-Dependent Work Function of Ge Nanocrystals Synthesized by Inert Gas Condensation

et al. 2021

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Understanding the size-dependent electronic properties of germanium nanocrystals (Ge NCs) is of fundamental importance for improving the efficiency of optoelectronic devices based on such NCs. Here, Ge NCs with a tunable size were synthesized by magnetron-sputtering cluster-beam deposition, where the size of the as-deposited Ge NCs can be finely controlled between 6 and 36 nm by helium gas flow rates and variable magnetic field configurations above the target surface. Because the size of the as-deposited Ge NCs highly depends on the nucleation process inside the plasma region, a detailed comparison between these two process parameters on the size control was formulated from the perspective of the growth kinetic mechanism. Furthermore, the local surface potential of different-sized Ge NCs deposited on n-type silicon substrates was measured by Kelvin probe force microscopy. The surface potential fluctuation of n-type Si covered by Ge NCs shows a strong size-dependent relationship with the size of the Ge NCs, whereas the surface potential fluctuation increases when their size reduced. Because the surface potential fluctuation between the intrinsic Ge NCs and the n-type silicon substrate tends to get smaller as the NCs’ size decreases due to the quantum confinement effect, the number of charges transferred between the electronic bands will reduce as the size of Ge NCs decreases. The latter exactly explains the observed experimental results. Therefore, this work offers a perspective to understand the behavior of charge transfer, which plays an important role in the performance of optoelectronic devices.

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“…In the past decade, EFM/KPFM has been successfully used to study the injection and retention of trapped charges in inorganic films, [ 16,25,45,46,52–57 ] polymer electrets, [ 47,58–60 ] organic small molecules, [ 42,44 ] the composition of polymer and organic semiconductors, [ 27,41,43 ] nanostructure, [ 48–51,61–78 ] double‐barrier CeO 2 /Si/CeO 2 /Si structures, [ 79 ] DNA molecules, [ 39–80 ] and thin‐film transistors. [ 81–86 ] For example, Heim et al proved that EFM is a useful technique to study the electronic properties of an organic monolayer island at the nanometer scale and found that both carriers are delocalized over the whole island in crystalline monolayer islands, while carriers stay localized at their injection point on a disordered monolayer.…”

Section: Introductionmentioning

confidence: 99%

Injection and Retention Characterization of Trapped Charges in Electret Films by Electrostatic Force Microscopy and Kelvin Probe Force Microscopy

Wang

Zhang

Cao

et al. 2020

Physica Status Solidi (a)

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Charge trapping memory has become a promising memory device due to its reliability, low cost, and simplicity. Its storage mechanism has attracted increasing attention. The properties of the storage layer are very important for the research of the device performance and mechanism. Herein, the technologies for the charge trapping properties of the storage layer are introduced first and then the study of charge trapping by electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM) is reviewed. The properties of trapped charges for inorganic, polymers, nanomaterials, and organic small molecules are reviewed, when different experimental parameters such as the atmospheric moisture, injection time\bias, and hydrophilicity of films are used. The injection and retention mechanisms are also summarized.

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Local charge trapping in Ge nanoclustersdetected by Kelvin probe force microscopy

Cited by 10 publications

References 41 publications

Квантові Точки — Основа Сучасного Та Майбутнього Матеріалознавства

Квантові Точки — Основа Сучасного Та Майбутнього Матеріалознавства

Tailoring Growth Kinetics toward a Size-Dependent Work Function of Ge Nanocrystals Synthesized by Inert Gas Condensation

Injection and Retention Characterization of Trapped Charges in Electret Films by Electrostatic Force Microscopy and Kelvin Probe Force Microscopy

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