scholarly journals Breath Figure-Assisted Fabrication of Nanostructured Coating on Silicon Surface and Evaluation of Its Antireflection Power

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Francesco Galeotti ◽  
Franco Trespidi ◽  
Mariacecilia Pasini
Keyword(s):  
Self Assembly ◽  
Silicon Surface ◽  
Antireflection Coating ◽  
Silicon Wafers ◽  
Nanostructured Coatings ◽  
Nanostructured Coating ◽  
Polymer Layers ◽  
Optical Reflectivity ◽  
Breath Figure ◽  
Nanostructured Polymer

We report our recent results on the fabrication of nanostructured polymer layers aimed at developing efficient antireflection coating on silicon. The proposed manufacturing approach is based on self-assembly and relies on breath figure formation. By simple and straightforward operations, we are able to produce different nanostructured coatings: densely packed nanodomes, randomly distributed nanopores, and multilayered close-packed nanopores. By optical reflectivity measurements on coated silicon wafers, we show that the latter type of nanostructure is able to reduce the reflectivity of standard silicon surface (≈40% at 450 nm) to about 10%.

Reactive Nanopattern in a Triple Structured Bio-Inspired Honeycomb Film as a Clickable Platform

2018 ◽  
Author(s):  
Pierre Marcasuzaa ◽  
Samuel Pearson ◽  
Karell Bosson ◽  
Laurence Pessoni ◽  
Jean-Charles Dupin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Double Porosity ◽  
Surface Groups ◽  
Specific Chemical ◽  
Site Specific ◽  
Surface Functionality ◽  
Wenzel State ◽  
Breath Figure ◽  
Responsive Surfaces ◽  
Secondary Population

A hierarchically structured platform was obtained from spontaneous self-assembly of a poly(styrene)-<i>b</i>-poly(vinylbenzylchloride) (PS-<i>b</i>-PVBC) block copolymer (BCP) during breath figure (BF) templating. The BF process using a water/ethanol atmosphere gave a unique double porosity in which hexagonally arranged micron-sized pores were encircled by a secondary population of smaller, nano-sized pores. A third level of structuration was simultaneously introduced between the pores by directed BCP self-assembly to form out-of-the-plane nano-cylinders, offering very rapid bottom-up access to a film with unprecedented triple structure which could be used as a reactive platform for introducing further surface functionality. The surface nano-domains of VBC were exploited as reactive nano-patterns for site-specific chemical functionalization by firstly substituting the exposed chlorine moiety with azide, then “clicking” an alkyne by copper (I) catalyzed azide-alkyne Huisgen cycloaddition (CuAAC). Successful chemical modification was verified by NMR spectroscopy, FTIR spectroscopy, and XPS, with retention of the micro- and nanostructuration confirmed by SEM and AFM respectively. Protonation of the cyclotriazole surface groups triggered a switch in macroscopic behavior from a Cassie-Baxter state to a Wenzel state, highlighting the possibility of producing responsive surfaces with hierarchical structure.

scholarly journals Туннельная эмиссия электронов из наноструктурированных кремниевых катодных матриц с фтор-углеродным покрытием

2019 ◽  
Vol 89 (6) ◽  
pp. 952
Author(s):  
Р.К. Яфаров
Keyword(s):  
Field Emission ◽  
Electric Fields ◽  
Silicon Surface ◽  
Silicon Wafers ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Physicochemical Models ◽  
Surface Modified ◽  
P Type ◽  
Carbon Plasma

AbstractVariations of the morphology and field-emission properties of surface-structured n - and p -type silicon wafers have been studied. The silicon surface has been structured by etching in a fluorine–carbon plasma and depositing subnanodimensional island carbon masks. It has been shown that surface structuring in a fluorine–carbon plasma makes it possible to reach desired field-emission currents in electric fields of different strengths. Physicochemical models of field emission mechanisms and models of destruction of surface-modified multipoint silicon array cathodes have been considered.

scholarly journals Optical Properties of Spin-Coated TiO2Antireflection Films on Textured Single-Crystalline Silicon Substrates

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ryosuke Watanabe ◽  
Yohei Eguchi ◽  
Takuya Yamada ◽  
Yoji Saito
Keyword(s):  
Optical Properties ◽  
Crystalline Silicon ◽  
Low Cost ◽  
Incident Light ◽  
Antireflection Coating ◽  
Silicon Wafers ◽  
Reflectance Spectra ◽  
Visible Range ◽  
Single Crystalline Silicon ◽  
Single Crystalline

Antireflection coating (ARC) prepared by a wet process is beneficial for low cost fabrication of photovoltaic cells. In this study, we investigated optical properties and morphologies of spin-coated TiO2ARCs on alkaline textured single-crystalline silicon wafers. Reflectance spectra of the spin-coated ARCs on alkaline textured silicon wafers exhibit no interferences and low reflectance values in the entire visible range. We modeled the structures of the spin-coated films for ray tracing numerical calculation and compared numerically calculated reflectance spectra with the experimental results. This is the first report to clarify the novel optical properties experimentally and theoretically. Optical properties of the spin-coated ARCs without interference are due to the fractional nonuniformity of the thickness of the spin-coated ARCs that cancels out the interference of the incident light.

Bonding of 2 mm thick silicon wafers using LTCC as an intermediate layer

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000436-000440 ◽  
Author(s):  
S. Günschmann ◽  
M. Fischer ◽  
T. Bley ◽  
I. Käpplinger ◽  
W. Brode ◽  
...  
Keyword(s):  
High Pressure ◽  
Wafer Bonding ◽  
Silicon Surface ◽  
Silicon Wafers ◽  
Anodic Bonding ◽  
Silicon Substrates ◽  
Infrared Transmission ◽  
Fusion Bonding ◽  
Internal Side ◽  
Bonding Technique

For the fabrication of a micro fluidic high pressure oil sensor (400 bar) based on an infrared transmission measuring principle the bonding of 2 mm silicon wafers is necessary. Conventional bonding techniques such as silicon fusion bonding or anodic bonding are not suitable for bonding thick and inflexible silicon wafers, because these techniques can not compensate for the wafer bow. We present a new bonding procedure for silicon substrates thicker than 1 mm using a silicon adapted LTCC tape as an intermediate leveling layer. The wafers are preprocessed by etching a nano structured silicon surface on the internal side. The silicon wafers are aligned and stacked with pre-structured green LTCC tapes by an optical stacking unit. During the hot isostatic lamination at 55 bar the structured LTCC tape is adjusted to the silicon. A subsequent pressure assisted sintering leads to a wafer bonding strength up to 5000 N/cm2. With the bonding technique it is possible to create cavities and channels between the thick wafers by the use of punched and laser cut LTCC. The fabrication steps of the sandwich build-up especially the sequential lamination and the optical adjusting procedure of the flexible (LTCC) and inflexible (2 mm Wafer) substrates will be explained in detail. A method to reduce the shrinkage and distortion of the green LTCC during handling is demonstrated. The distribution of the bonding and bursting strength of the single fluidic systems on a complete sandwich substrate is analyzed.

scholarly journals Highly-ordered onion micelles made from amphiphilic highly-branched copolymers

2018 ◽  
Vol 9 (47) ◽  
pp. 5617-5629 ◽  
Author(s):  
Sarah L. Canning ◽  
Joseph M. F. Ferner ◽  
Natalie M. Mangham ◽  
Trevor J. Wear ◽  
Stuart W. Reynolds ◽  
...  
Keyword(s):  
Self Assembly ◽  
Branched Copolymers ◽  
Polymer Layers

Uniform onion micelles formed from up to ten nano-structured polymer layers were produced by the aqueous self-assembly of highly-branched copolymers.

Self-Assembly of Inorganic/Organic Multilayer Films

1994 ◽  
Vol 351 ◽  
Author(s):  
Astrid C. Zeppenfeld ◽  
Catherine J. Page
Keyword(s):  
Self Assembly ◽  
Grazing Angle ◽  
Multilayer Films ◽  
Silicon Wafers ◽  
Initial Surface ◽  
X Ray Diffraction ◽  
Individual Layer ◽  
X Ray ◽  
Influence Of Substrate ◽  
The Individual

ABSTRACTIn order to investigate the influence of substrate functionalization on the subsequent selfassembly of multilayer films, multilayers composed of alternating hafnium and 1,10-decanediylbis(phosphonic) acid (DBPA) have been grown on three different substrates. Substrates studied include gold wafers functionalized with 4-mercaptobutylphosphonic acid, silicon wafers functionalized using a hafnium oxychloride solution, and silicon wafers coated with an octadecylphosphonate LB-template layer. The nature of these films is probed using ellipsometry and grazing angle x-ray diffraction. These studies indicate that the overall order and the individual layer thickness can vary substantially from sample to sample and depend strongly on the initial surface functionalization prior to multilayer growth.

Hierarchically porous bio-inspired films prepared by combining “breath figure” templating and selectively degradable block copolymer directed self-assembly

2016 ◽  
Vol 52 (61) ◽  
pp. 9562-9565 ◽  
Author(s):  
Arthur Bertrand ◽  
Antoine Bousquet ◽  
Christine Lartigau-Dagron ◽  
Laurent Billon
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Bottom Up ◽  
Hierarchically Porous ◽  
Breath Figure

Hierarchically porous bio-inspired honeycomb films prepared by combining the breath figure bottom-up process and selectively degradable block copolymer directed self-assembly.

Self-Assembly of Ionic Liquid (BMI-PF6)-Stabilized Gold Nanoparticles on a Silicon Surface: Chemical and Structural Aspects

Langmuir ◽  
2008 ◽  
Vol 24 (15) ◽  
pp. 7785-7792 ◽  
Author(s):  
Om P. Khatri ◽  
Kosaku Adachi ◽  
Kuniaki Murase ◽  
Ken-ichi Okazaki ◽  
Tsukasa Torimoto ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Self Assembly ◽  
Silicon Surface ◽  
Surface Chemical ◽  
Structural Aspects

2-Step self-assembly method to fabricate broadband omnidirectional antireflection coating in large scale

2011 ◽  
Vol 95 (2) ◽  
pp. 699-703 ◽  
Author(s):  
K.M. Yeung ◽  
W.C. Luk ◽  
K.C. Tam ◽  
C.Y. Kwong ◽  
M.A. Tsai ◽  
...  
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Antireflection Coating ◽  
Assembly Method
Sign in / Sign up

Export Citation Format

Share Document