Trap-Assisted Transport in Silicon Nanorods

Ghanta, Ujjwal; Hossain, Syed Minhaz

doi:10.1007/978-981-13-3122-0_37

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Silicon-based nanomaterials, including silicon nanoparticles (SiNPs), silicon nanowires, silicon nanorods, silicon quantum dots, silicon nano-shuttles, and so on, have become emerging research concerns in the nanoscience field due to their outstanding physical or chemical properties. − Prominently, fluorescent SiNPs have become dazzling stars and were active in the research arena of nanomaterials owing to abundant silicon sources, low toxicity or non-toxicity, remarkable optical properties, peculiar hydrophilicity and surface modifiability. , Thus, considerable research efforts have been devoted to exploring different kinds of synthetic methods so that the obtained SiNPs with preeminent properties. Zhong et al conducted (3-aminopropyl)-trimethoxysilane (APTMS) and trisodium citrate dihydrate via a microwave-assisted strategy to prepare SiNPs that emitted blue fluorescence (∼460 nm) at 160 °C .…”

Section: Introductionmentioning

confidence: 99%

Green- and Red-Emitting Fluorescent Silicon Nanoparticles: Synthesis, Mechanism, and Acid Phosphatase Sensing

Han

Wang

Xingchen

et al. 2021

ACS Appl. Bio Mater.

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Until now, the green and facile synthesis of multicolor fluorescent silicon nanoparticles (SiNPs) with favorable biocompatibility for cellular imaging and biosensors is still a challenge. Herein, a facile one-step room temperature method for preparing fluorescent SiNPs displayed different emission wavelengths was reported. Green and red fluorescent SiNPs (G-SiNPs and R-SiNPs) were synthesized by adjusting the concentration of the reducing agent 2,4-diaminophenol hydrochloride when the amount of N-[3-(trimethoxysilyl)-propyl]-ethylenediamine was consistent. Characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, the results revealed that the G-SiNPs and R-SiNPs were assembled by polymerization of different building blocks, and the emission characteristics of these SiNPs were attributed to the difference in their structural composition and particle size. Interestingly, these fluorescent SiNPs exhibited excellent water solubility, salt tolerance, pH stability, photobleaching resistance, and low cytotoxicity, which facilitated multicolor cell imaging, and further led to these SiNPs were highly attractive in a variety of applications, such as multi-channel sensing and biological imaging. Furthermore, the R-SiNPs have shown the potential to detect acid phosphatase, which is a biomarker of prostate cancer.

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Section: Introductionmentioning

confidence: 99%

Green- and Red-Emitting Fluorescent Silicon Nanoparticles: Synthesis, Mechanism, and Acid Phosphatase Sensing

Han

Wang

Xingchen

et al. 2021

ACS Appl. Bio Mater.

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Optically enhanced trap assisted hysteretic I-V characteristics of nanocrystalline silicon based p-i-n heterostructure

Chakrabarty

Das

Ray

et al. 2020

Journal of Applied Physics

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A p-i-n heterostructure containing electrochemically synthesized silicon (Si) nanorods embedded in a nonstoichiometric silicon oxide matrix sandwiched as i-layer between p-Si and n-type hydrogeneted amorphous Si shows hysteresis in both forward and reverse biases with an additional switching in forward bias. Conductivity in the trace path is lesser than the retrace path. Hysteresis in the reverse bias has been found to get enhanced up to three orders of magnitude under illumination by laser sources of different intensities and wavelengths showing the potential of the structure as an effective memory device. Hysteresis area and conductivity become maximum for red light and gradually decrease for green and violet light for fixed intensity. It is well known that the Si nanocrystal–silicon oxide interface contains a lot of electron and hole trap levels within the bandgap. Trapping and detrapping of photogenerated carriers at the trap/defect states are expected to affect the band bending at the junctions. The observed optically enhanced hysteresis has been explained through formation and destruction of the potential barrier at junctions during trace and retrace paths, respectively. The potential has been estimated by solving Poisson's equation, and the current–voltage (I–V) relation for trace and retrace paths has been derived where the rate of trapping and detrapping becomes different resulting in the observed hysteresis. Theoretically obtained I–V characteristics match well with the experimentally obtained results. The trap density in the i-layer estimated to be ∼1011/cm2 is in good agreement for the trap density in similar systems.

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Trap-Assisted Transport in Silicon Nanorods

Cited by 2 publications

References 11 publications

Green- and Red-Emitting Fluorescent Silicon Nanoparticles: Synthesis, Mechanism, and Acid Phosphatase Sensing

Green- and Red-Emitting Fluorescent Silicon Nanoparticles: Synthesis, Mechanism, and Acid Phosphatase Sensing

Optically enhanced trap assisted hysteretic I-V characteristics of nanocrystalline silicon based p-i-n heterostructure

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