Combined plasma gas-phase synthesis and colloidal processing of InP/ZnS core/shell nanocrystals

Gresback, Ryan; Hue, Ryan J.; Gladfelter, Wayne L.; Kortshagen, Uwe R.

doi:10.1186/1556-276x-6-68

Cited by 26 publications

(22 citation statements)

References 19 publications

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“…Interestingly, when simultaneously doped with both n -type and p -type carriers, these so-called codoped n , p -Si QDs display sub-band-gap photoluminescence energy, indicative of donor–acceptor pair recombination. , This phenomenon has only been demonstrated in ion-beam implantation samples and may be a desirable path for nonthermal plasma synthesis to access lower energy IR wavelengths in Si-based QDs. Binary and alloy III–V InP, GaP, and In x Ga 1– x P were recently prepared by us through nonthermal methods and, like the original report of gas-phase InP synthesis, achieved visible-emitting QDs. The phosphine (PH 3 ) and trimethylindium(gallium) (In(CH 3 ) 3 and Ga(CH 3 ) 3 ) precursors used in these approaches begs the question of whether other readily available semiconductor precursor gases such as arsine (AsH 3 ) could be used to generate lower band gap InAs QDs.…”

Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 98%

Infrared Quantum Dots: Progress, Challenges, and Opportunities

et al. 2019

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Infrared technologies provide tremendous value to our modern-day society. The need for easy-to-fabricate, solution-processable, tunable infrared active optoelectronic materials has driven the development of infrared colloidal quantum dots, whose band gaps can readily be tuned by dimensional constraints due to the quantum confinement effect. In this Perspective, we summarize recent progress in the development of infrared quantum dots both as infrared light emitters (e.g., in light-emitting diodes, biological imaging, etc.) as well as infrared absorbers (e.g., in photovoltaics, solar fuels, photon up-conversion, etc.), focusing on how fundamental breakthroughs in synthesis, surface chemistry, and characterization techniques are facilitating the implementation of these nanostructures into exploratory device architectures as well as in emerging applications. We discuss the ongoing challenges and opportunities associated with infrared colloidal quantum dots.

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Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 98%

Infrared Quantum Dots: Progress, Challenges, and Opportunities

et al. 2019

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Section: Synthesis Of Compound Semiconductor Nanocrystalsmentioning

confidence: 99%

Section: Synthesis Of Compound Semiconductor Nanocrystalsmentioning

confidence: 99%

“…Gresback et al used the same approach as Anthony et al but replaced TMGa with trimethylindium (In(CH 3 ) 3 or TMIn) and NH 3 with PH 3 to synthesize InP nanocrystals in a 13.56 MHz rf plasma. 340 The precursor gases were heavily diluted in Ar and the feed gas contained Ar, H 2 , PH 3 , and TMIn in the 90:17:3:1 ratio. Gresback et al varied the residence time of the gases systematically between 2 and 10 ms by varying the gas flow rate and synthesized InP nanocrystals with diameters up to 4.3 ± 0.8 nm at 10 ms. XRD, Raman, and TEM established that the nanocrystals were zinc blende InP.…”

Section: Phosphidesmentioning

confidence: 99%

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Nonthermal Plasma Synthesis of Nanocrystals: Fundamental Principles, Materials, and Applications

et al. 2016

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Nonthermal plasmas have emerged as a viable synthesis technique for nanocrystal materials. Inherently solvent and ligand-free, nonthermal plasmas offer the ability to synthesize high purity nanocrystals of materials that require high synthesis temperatures. The nonequilibrium environment in nonthermal plasmas has a number of attractive attributes: energetic surface reactions selectively heat the nanoparticles to temperatures that can strongly exceed the gas temperature; charging of nanoparticles through plasma electrons reduces or eliminates nanoparticle agglomeration; and the large difference between the chemical potentials of the gaseous growth species and the species bound to the nanoparticle surfaces facilitates nanocrystal doping. This paper reviews the state of the art in nonthermal plasma synthesis of nanocrystals. It discusses the fundamentals of nanocrystal formation in plasmas, reviews practical implementations of plasma reactors, surveys the materials that have been produced with nonthermal plasmas and surface chemistries that have been developed, and provides an overview of applications of plasma-synthesized nanocrystals.

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“…Semiconductor NCs provide size-tunable optical and electrical properties, based on quantum confinement of charge carriers within them, high surface-to-volume ratios, and other attributes that have led to the development of a new generation of materials and devices [ 7 - 10 ]. Because of their various unique properties, there has been considerable interest in the synthesis of high-quality III-V compound NCs [ 11 , 12 ]. InSb has the smallest effective mass, the narrowest bandgap, and the highest intrinsic electron mobility of III-V semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ultrathin InSb nanocrystals film deposited on SiO2/Si substrate

Deng-Yue

Sun

et al. 2011

Nanoscale Res Lett

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Recently, solid-phase recrystallization of ultrathin indium antimonide nanocrystals (InSb NCs (films grown on SiO2/Si substrate is very attractive, because of the rapid development of thermal annealing technique. In this study, the recrystallization behavior of 35 nm indium antimonide film was studied. Through X-ray diffraction (XRD) analysis, it is demonstrated that the InSb film is composed of nanocrystals after high temperature rapid thermal annealing. Scanning electron microscopy shows that the film has a smooth surface and is composed of tightly packed spherical grains, the average grain size is about 12.3 nm according to XRD results. The optical bandgap of the InSb NCs film analyzed by Fourier Transform infrared spectroscopy measurement is around 0.26 eV. According to the current-voltage characteristics of the InSb NCs/SiO2/p-Si heterojunction, the film has the rectifying behavior and the turn-on voltage value is near 1 V.

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Combined plasma gas-phase synthesis and colloidal processing of InP/ZnS core/shell nanocrystals

Cited by 26 publications

References 19 publications

Infrared Quantum Dots: Progress, Challenges, and Opportunities

Infrared Quantum Dots: Progress, Challenges, and Opportunities

Nonthermal Plasma Synthesis of Nanocrystals: Fundamental Principles, Materials, and Applications

Characterization of ultrathin InSb nanocrystals film deposited on SiO2/Si substrate

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