نتایج جستجو برای: silicon halide

تعداد نتایج: 88191  

2016
Fedwa El-Mellouhi El Tayeb Bentria Sergey N. Rashkeev Sabre Kais Fahhad H. Alharbi

In the past few years, the meteoric development of hybrid organic-inorganic perovskite solar cells (PSC) astonished the community. The efficiency has already reached the level needed for commercialization; however, the instability hinders its deployment on the market. Here, we report a mechanism to chemically stabilize PSC absorbers. We propose to replace the widely used methylammonium cation (...

Journal: :Chemical communications 2010
Devendra J Vyas Martin Oestreich

An unprecedented copper-catalysed allylic transposition enables the regioselective synthesis of branched allylic silanes from linear allylic halides through direct C-Si bond formation.

2013
Gianni Olguin Christelle Yacou Simon Smart João C. Diniz da Costa

The functionality or oxidation state of cobalt within a silica matrix can be tailored through the use of cationic surfactants and their halide counter ions during the sol-gel synthesis. Simply by adding surfactant we could significantly increase the amount of cobalt existing as Co3O4 within the silica from 44% to 77%, without varying the cobalt precursor concentration. However, once the surfact...

2016
Kenneth K. Chen Kristine Liao Gilberto Casillas Yiying Li Geoffrey A. Ozin

In this report, the synthesis of a novel class of cationic quaternary ammonium-surface-functionalized silicon nanocrystals (ncSi) using a novel and highly versatile terminal alkyl halide-surface-functionalized ncSi synthon is described. The distinctive features of these cationic ncSi include colloidal stability, pH-independent positive surface charge, and size-tunable photoluminescence (PL) in ...

Journal: :Nano letters 2018
Li Ji Hsien-Yi Hsu Jack C Lee Allen J Bard Edward T Yu

Hybrid organic-inorganic halide perovskites (HOIPs) have recently attracted tremendous attention because of their excellent semiconducting and optoelectronic properties, which exist despite their morphology and crystallinity being far inferior to those of more mature semiconductors, such as silicon and III-V compound semiconductors. Heteroepitaxy can provide a route to achieving high-performanc...

Journal: :Journal of the American Chemical Society 2013
Leslie E O'Leary Michael J Rose Tina X Ding Erik Johansson Bruce S Brunschwig Nathan S Lewis

The Heck reaction has been used to couple olefins to a Si(111) surface that was functionalized with a mixed monolayer comprised of methyl and thienyl groups. The coupling method maintained a conjugated linkage between the surface and the olefinic surface functionality, to allow for facile charge transfer from the silicon surface. While a Si(111) surface terminated only with thienyl groups displ...

2017
Guifang Han Sam Zhang Pablo P. Boix Lydia Helena Wong Lidong Sun Shui-Yang Lien

As an alternative to single crystal silicon photovoltaics, thin film solar cells have been extensively explored for miniaturized cost-effective photovoltaic systems. Though the fight to gain efficiency has been severely engaged over the years, the battle is not yet over. In this review, we comb the fields to elucidate the strategies towards high efficiency thin films solar cells and provide poi...

2010
Jorge Cabello Kevin Wells

Thin tissue autoradiography is an imaging modality where ex-vivo tissue sections are placed in direct contact with autoradiographic film. These tissue sections contain a radiolabelled ligand bound to a specific biomolecule under study. This radioligand emits βor β+ particles ionising silver halide crystals in the film. High spatial resolution autoradiograms are obtained using low energy radiois...

Journal: :Materials Research-ibero-american Journal of Materials 2022

Thin film solar cell materials such as 3D metal halide perovskites are cheaper alternatives to silicon. Presently, the conversion efficiency of lead is 25.5% (2021), which represents an increase more than 550% since their discovery in 2009 (3.8%). Despite this remarkable progress, concerns about toxicity have sparked quest for possible substitutes, particular, tin perovskites. This review cover...

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