Photosensitive organic-inorganic hybrid structures based on porous silicon

Abstract

In this study, the photovoltaic organic-inorganic structures were created by deposition of poly(3,4-ethylenedioxythiophene) film doped by poly(styrenesulfonate) and reduced graphene oxide on the porous silicon/silicon substrate. Formation of the hybrid structure was confirmed by means of atomic-force microscopy and Fourier transform infrared spectroscopy. The current-voltage characteristics of the obtained structures were studied. It was found the increase of electrical conductivity and photo-induced signal in organic-inorganic structures. Temporal parameters and spectral characteristics of photoresponse in the 400–1100?nm wavelength range were investigated. The widening of spectral photosensitivity in a short-wavelength range due to light absorption in various layers of the multijunction structure in comparison with single crystal silicon was revealed.     

Photosensitive Materials for Integrated Optic Applications

Abstract

This article presents results of device fabrication using UV processing of materials and integrated optic components produced by flame hydrolysis deposition and hybrid sol-gel technology. Photosensitive materials were employed in the fabrication of channel waveguides and channel photo-imprinted waveguides incorporating Bragg gratings through single and double-step exposure.     

双亲性无规共聚物P（VM-co-AMPS）的自组装及其性能

以2-丙烯酰胺基-2-甲基丙磺酸（AMPS）和苯乙烯类光敏单体7-（4-乙烯基苄氧基）-4-甲基香豆素（VM）为共聚单体,采用自由基聚合法制备了光敏性双亲共聚物P（VM-co-AMPS）。P（VM-co-AMPS）在溶剂水中自组装胶束化,用原子力显微镜（AFM）表征了自组装胶体粒子的形态、粒径及其分布。紫外光照使胶体粒子中香豆素基元发生光二聚反应,用紫外-可见光分光光度计（UV-Vis）跟踪其光二聚交联过程,用光学显微镜考察了胶体粒子的乳化性能。结果表明：胶体粒子具有较好的紫外吸收性能和较好的乳化性能。该胶束制备工艺简单,条件温和,避免了溶剂的使用。     

Electro-optic effect,propagation loss,and switching speed in polymers containing nano-sized droplets of liquid crystal

Polymers containing droplets of liquid crystal smaller than 100 nm, which have good transparency and easily form films, were prepared under various conditions to evaluate their potential as electro-optic materials for waveguide-type devices. By varying the liquid crystal concentration and the strength of the UV irradiation causing photo-induced phase separation of the droplets, we were able to control the droplet size and density. We have clarified how the birefringence generated in an applied electric field, switching speed, and optical loss of light propagating in the film depend on droplet size and density. Polymer materials having a large electro-optic effect (δn = 0.001 at 8 V μm^-1), low propagation loss (~2.5 dB cm^-1), and fast response time (~10 μs) have been developed.     

含蒽醌基单偶氮染料光电导性质构效研究

由1-氨基蒽醌和不同偶合基合成了九个含蒽醌基的单偶氮染料,并对其进行了 元素分析、红外光谱和紫外光谱表征。紫外光谱研究结果表明,偶合基酰胺芳环上 取代基对偶氮染料的吸收光谱影响不大。当偶合基由2-羟基-3-氨替酰胺萘酚（ Azol～8)变为2-羟基-11氢-苯并咔唑-3-氨替酰胺萘酚（Azo9)时,偶氮染料的吸收 红移了130 nm,最大吸收出现在662 nm处,成为近红外染料。偶氮染料光电导性质 的研究表,偶合基酰胺芳环上取代基吸电子效应越强,光敏性越好,且与Hammett 常数σ有良好的相关性。值得注意的是萘环上扩大一个咔唑环（Azo9),使偶氮染 料的光敏性提高了几十倍,表明在萘环上扩大共轭环是提高偶氮染料光敏性的一个 良好途径。     

鱼明胶介质中AgBr/I纳米粒子的生长与感光性能

本文以鱼明胶为分散介质,采用双注法制备AgBr/I纳米粒子乳剂,控制银盐与卤溶液的注入速率(R),以TEM观测了粒子的生长,据此探讨了该乳剂中AgBr/I纳米粒子平均粒径(d)及分布(±σ)与反应条件的关系.发现在R为1.3 mmol/min^-8 mmol/min范围内,随R增大,d减小,R-d间呈良好的线性关系.除个别外,±σ值变化不明显.对于该纳米粒子乳剂采用二氧化硫脲进行化学敏化,结果表明:适当增加二氧化硫脲的加入量和延长敏化时间,均可有效提高乳剂的感光度,并有助于改善其低照度互易律失效,此外还揭示了曝光光源色温对该乳剂感光性能的影响.     

酸增殖剂研究进展

本文综述了能有效提高化学增幅抗蚀剂体系感度的各种类型酸增殖剂及其酸增殖机理.对某些常用于光致抗蚀剂中的酸增殖剂的特性作了介绍.并对它们的应用前景、现存问题和改进方向进行了简单讨论和介绍.     

Enhancement of photosensitivity in bismuth doped Cu2ZnSnS4 thin films

In this paper, the effect of bismuth doping on the structural, morphological, optical and electrical properties of Cu₂ZnSnS₄ (CZTS) films has been investigated. The undoped and bismuth doped CZTS films (0, 0.5, 1, 1.5 and 2 mol%) were deposited on glass substrates by solution based method. The XRD result shows a significant improvement in the crystallinity of the films with increase in bismuth concentration. The Raman spectra of the films show the dominant peak at 334 cm^–1 corresponding to A₁ vibrational mode of CZTS kesterite phase. The FESEM micrographs of the films show an enhancement in the grain size and densification with the addition of bismuth ion concentration. The optical bandgap of the films was found to vary (1.59–1.40 eV) with the doping of bismuth ions. The I –V characteristics indicate twofold increment in the photoconductivity for the bismuth doped CZTS films under 100 mW/cm² illumination suggesting their potential application in photovoltaic devices. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)     

Fabrication of High Reflection UVWritten Fiber Bragg Gratings

l.IntroductionFibergratingshaveattractedanincreasingamountofattentionsineeG.Meltz[1Jandhisco-workersfirstdemonstratedinl989thatPermanentgratingscouldbewrittenbyex-peinganoPticalfiberfromthesidetotwointerferingbeamsofultraviolet(UV)light.Inrecentyears,avastresearchefforthasbeendevotedtoopticalfiberBragggratingsallovertheworld.Theirsimplicity,usefu1nesscoupledtotheiruniqueproPertiesandnu-merousadvantagesmakethemidealforawiderangeofimPOrtantapplicationsinopticalfibertelecommunications,lasersa…     

Technological significance of sol-gel process and process-induced variations in sol-gel materials and coatings

A significant aspect of sol-gel technology is the capability it provides to affect the substructure of materials by controlling the nature and the kinetics of chemical reactions. This capability allows us to produce novel materials, design unique molecular and pore morphologies, circumvent high-temperature reactions, and modify material properties. The modifications include strongly thermodynamic-dependent high-temperature properties such as sintering, crystallization, and viscosity in glass and ceramic materials. A particularly exciting area for investigation is the optical-electronic field, where a significant dependence of electro-optical properties and photosensitivity on process-induced molecular-structural variations occurs. Understanding the basis for the creation of structural variations in sol-gel processes should have significant impact on the technologies and systems that use these materials. In this article, some fundamental aspects of alkoxide-based, sol-gel processes and thermochemical bases for process-induced structural variates are discussed.