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https://www.readbyqxmd.com/read/28342848/ultraviolet-a-induced-oxidation-in-cornea-characterization-of-the-early-oxidation-related-events
#1
Corinne Zinflou, Patrick J Rochette
Exposure to sunlight ultraviolet-A (UVA), the main component of solar UV reaching the eyes, is suspected to play an important part in the onset of ocular pathologies. UVA primary biological deleterious effects arise from the photo-induction of oxidative stress in cells. However, the molecular bases linking UVA-induced oxidation to UVA toxicity in eyes remain poorly understood, especially with regards to the cornea. To shed some light on this issue, we have investigated the susceptibility and response potential of the different corneal cellular layers (epithelium, stroma and endothelium) to UVA-induced oxidation...
March 22, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28340299/bifurcation-of-regeneration-and-recombination-in-dye-sensitized-solar-cells-via-electronic-manipulation-of-tandem-cobalt-redox-shuttles
#2
Josh Baillargeon, Yuling Xie, Thomas W Hamann
A cobalt(IV/III) redox shuttle, cobalt tris(2-(p-tolyl)pyridine), [Co(ptpy)3]+/0, was synthesized and investigated for use in dye-sensitized solar cells, DSSCs. An incredibly fast self-exchange rate constant of (9.2  3.9) × 108 M-1s-1 was determined for [Co(ptpy)3]+/0, making it an ideal candidate for dye regeneration. To avoid fast recombination and solubility limitations, a tandem electrolyte containing [Co(ptpy)3]+/0 and cobalt tris(2,2'-bipyridine), [Co(bpy)3]3+/2+, was utilized. An improved short circuit current density is achieved for DSSCs employing the tandem electrolyte, compared to electrolytes containing only [Co(bpy)3]3+/2+, consistent with superior dye regeneration expected based on predictions using Marcus Theory, which is also discussed...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338627/morphology-analysis-and-optimization-crucial-factor-determining-the-performance-of-perovskite-solar-cells
#3
REVIEW
Wenjin Zeng, Xingming Liu, Xiangru Guo, Qiaoli Niu, Jianpeng Yi, Ruidong Xia, Yong Min
This review presents an overall discussion on the morphology analysis and optimization for perovskite (PVSK) solar cells. Surface morphology and energy alignment have been proven to play a dominant role in determining the device performance. The effect of the key parameters such as solution condition and preparation atmosphere on the crystallization of PVSK, the characterization of surface morphology and interface distribution in the perovskite layer is discussed in detail. Furthermore, the analysis of interface energy level alignment by using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy is presented to reveals the correlation between morphology and charge generation and collection within the perovskite layer, and its influence on the device performance...
March 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28338088/functional-solid-additive-modified-pedot-pss-as-an-anode-buffer-layer-for-enhanced-photovoltaic-performance-and-stability-in-polymer-solar-cells
#4
Binrui Xu, Sai-Anand Gopalan, Anantha-Iyengar Gopalan, Nallal Muthuchamy, Kwang-Pill Lee, Jae-Sung Lee, Yu Jiang, Sang-Won Lee, Sae-Wan Kim, Ju-Seong Kim, Hyun-Min Jeong, Jin-Beon Kwon, Jin-Hyuk Bae, Shin-Won Kang
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability and restricted photovoltaic (PV) performance for the fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been used in the PEDOT: PSS buffer layer to obtain modified properties for PEDOT: PSS@DOH and achieve high PV performances...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337916/ag-incorporated-organic-inorganic-perovskite-films-and-planar-heterojunction-solar-cells
#5
Qi Chen, Lei Chen, Fengye Ye, Ting Zhao, Feng Tang, Adharsh Rajagopal, Zheng Jiang, Shenlong Jiang, Alex K-Y Jen, Yi Xie, Jinhua Cai, Liwei Chen
Controlled doping for adjustable material polarity and charge carrier concentration is the basis of semiconductor materials and devices, and it is much more difficult to achieve in ionic semiconductors (e.g. ZnO and GaN) than in covalent semiconductors (e.g. Si and Ge), due to the high intrinsic defect density in ionic semiconductors. The organic-inorganic perovskite material, which is frenetically being researched for applications in solar cells and beyond, is also an ionic semiconductor. Here we present the Ag-incorporated organic-inorganic perovskite films and planar heterojunction solar cells...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28337807/a-strategy-for-breaking-polyoxometalate-based-mofs-to-obtain-high-loading-amount-of-nanosized-polyoxometalate-clusters-to-improve-the-performance-of-dye-sensitized-solar-cells
#6
Xiaotao Zheng, Weilin Chen, Li Chen, Yijing Wang, Xiangwei Guo, Jiabo Wang, En-Bo Wang
Polyoxometalate (POM) has already been confirmed to act as an effective electron-transfer mediator for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs) based on our studies. However, it may be limited by the agglomeration of the polyoxoanions. In this paper, we improve our previous synthesis strategy by breaking the MOFs with POMs as the secondary building units ([Ni(bpp)(H2O)2]3[P2W18O62]·24H2O(1) and H6[Cu3(H2O)6(P2W18O62)2(3-dpye)6]·28H2O (2)) to design and synthesize small-size and high-dispersive POM nanoparticles by means of compositing with TiO2 via the calcination to remove the organic ligand...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28336867/synthesis-of-multicolor-core-shell-naluf%C3%A2-yb-3-ln-3-caf%C3%A2-upconversion-nanocrystals
#7
Hui Li, Shuwei Hao, Chunhui Yang, Guanying Chen
The ability to synthesize high-quality hierarchical core/shell nanocrystals from an efficient host lattice is important to realize efficacious photon upconversion for applications ranging from bioimaging to solar cells. Here, we describe a strategy to fabricate multicolor core @ shell α-NaLuF₄:Yb(3+)/Ln(3+)@CaF₂ (Ln = Er, Ho, Tm) upconversion nanocrystals (UCNCs) based on the newly established host lattice of sodium lutetium fluoride (NaLuF₄). We exploited the liquid-solid-solution method to synthesize the NaLuF₄ core of pure cubic phase and the thermal decomposition approach to expitaxially grow the calcium fluoride (CaF₂) shell onto the core UCNCs, yielding cubic core/shell nanocrystals with a size of 15...
February 7, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336851/nano-photonic-structures-for-light-trapping-in-ultra-thin-crystalline-silicon-solar-cells
#8
Prathap Pathi, Akshit Peer, Rana Biswas
Thick wafer-silicon is the dominant solar cell technology. It is of great interest to develop ultra-thin solar cells that can reduce materials usage, but still achieve acceptable performance and high solar absorption. Accordingly, we developed a highly absorbing ultra-thin crystalline Si based solar cell architecture using periodically patterned front and rear dielectric nanocone arrays which provide enhanced light trapping. The rear nanocones are embedded in a silver back reflector. In contrast to previous approaches, we utilize dielectric photonic crystals with a completely flat silicon absorber layer, providing expected high electronic quality and low carrier recombination...
January 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335596/fast-fabrication-of-stable-perovskite-solar-cell-with-an-ultrathin-effective-novel-inorganic-hole-transport-layer
#9
Aibin Huang, Lei Lei, Jingting Zhu, Yu Yu, Yan Liu, Songwang Yang, Shanhu Bao, Xun Cao, Ping Jin
Aiming at fabricating simple, reproducible and scalable perovskite solar cells (PSCs) with least time consuming, novel CoOx hole transport layer (HTL) was first proposed and introduced in this work. The CoOx HTL thickness was minimized to about 10 nm with complete coverage on FTO substrate (F doped SnO2) by DC magnetron sputtering. The compact ultrathin HTL could minimize the incident light loss caused by cobalt ion absorption and reduce the carrier transport loss by shortening the transport path. Copper ion doping was employed to address the low conductivity of CoOx film and the energy level mismatch between CoOx and perovskite material...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28335321/two-dimensional-semiconductor-optoelectronics-based-on-van-der-waals-heterostructures
#10
REVIEW
Jae Yoon Lee, Jun-Hwan Shin, Gwan-Hyoung Lee, Chul-Ho Lee
Two-dimensional (2D) semiconductors such as transition metal dichalcogenides (TMDCs) and black phosphorous have drawn tremendous attention as an emerging optical material due to their unique and remarkable optical properties. In addition, the ability to create the atomically-controlled van der Waals (vdW) heterostructures enables realizing novel optoelectronic devices that are distinct from conventional bulk counterparts. In this short review, we first present the atomic and electronic structures of 2D semiconducting TMDCs and their exceptional optical properties, and further discuss the fabrication and distinctive features of vdW heterostructures assembled from different kinds of 2D materials with various physical properties...
October 27, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335319/influence-of-quantum-dot-concentration-on-carrier-transport-in-zno-tio%C3%A2-nano-hybrid-photoanodes-for-quantum-dot-sensitized-solar-cells
#11
Francis S Maloney, Uma Poudyal, Weimin Chen, Wenyong Wang
Zinc oxide nanowire and titanium dioxide nanoparticle (ZnO:TiO₂ NW/NP) hybrid films were utilized as the photoanode layer in quantum dot-sensitized solar cells (QDSSCs). CdSe quantum dots (QDs) with a ZnS passivation layer were deposited on the ZnO:TiO₂ NW/NP layer as a photosensitizer by successive ion layer adsorption and reaction (SILAR). Cells were fabricated using a solid-state polymer electrolyte and intensity-modulated photovoltage and photocurrent spectroscopy (IMVS/PS) was carried out to study the electron transport properties of the cell...
October 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335311/a-study-of-inverted-type-perovskite-solar-cells-with-various-composition-ratios-of-fapbi%C3%A2-1-x-mapbbr%C3%A2-x
#12
Lung-Chien Chen, Zong-Liang Tseng, Jun-Kai Huang
This work presents mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite films with various composition ratios, x (x = 0-1), which are formed using the spin coating method. The structural, optical, and electronic behaviors of the mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite films are discussed. A device with structure glass/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/mixed perovskite/C60/BCP/Ag was fabricated. The mixed perovskite film was an active light-harvesting layer. PEDOT: PSS was a hole transporting layer between the ITO and perovskite...
October 13, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335285/graphene-and-carbon-quantum-dot-based-materials-in-photovoltaic-devices-from-synthesis-to-applications
#13
REVIEW
Sofia Paulo, Emilio Palomares, Eugenia Martinez-Ferrero
Graphene and carbon quantum dots have extraordinary optical and electrical features because of their quantum confinement properties. This makes them attractive materials for applications in photovoltaic devices (PV). Their versatility has led to their being used as light harvesting materials or selective contacts, either for holes or electrons, in silicon quantum dot, polymer or dye-sensitized solar cells. In this review, we summarize the most common uses of both types of semiconducting materials and highlight the significant advances made in recent years due to the influence that synthetic materials have on final performance...
August 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335273/nanostructured-solar-cells
#14
EDITORIAL
Guanying Chen, Zhijun Ning, Hans Ågren
We are glad to announce the Special Issue "Nanostructured Solar Cells", published in Nanomaterials. This issue consists of eight articles, two communications, and one review paper, covering major important aspects of nanostructured solar cells of varying types. From fundamental physicochemical investigations to technological advances, and from single junction solar cells (silicon solar cell, dye sensitized solar cell, quantum dots sensitized solar cell, and small molecule organic solar cell) to tandem multi-junction solar cells, all aspects are included and discussed in this issue to advance the use of nanotechnology to improve the performance of solar cells with reduced fabrication costs...
August 9, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335256/electrospinning-of-nanofibers-for-energy-applications
#15
REVIEW
Guiru Sun, Liqun Sun, Haiming Xie, Jia Liu
With global concerns about the shortage of fossil fuels and environmental issues, the development of efficient and clean energy storage devices has been drastically accelerated. Nanofibers are used widely for energy storage devices due to their high surface areas and porosities. Electrospinning is a versatile and efficient fabrication method for nanofibers. In this review, we mainly focus on the application of electrospun nanofibers on energy storage, such as lithium batteries, fuel cells, dye-sensitized solar cells and supercapacitors...
July 2, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335245/ag-nanoparticle-functionalized-open-ended-freestanding-tio%C3%A2-nanotube-arrays-with-a-scattering-layer-for-improved-energy-conversion-efficiency-in-dye-sensitized-solar-cells
#16
Won-Yeop Rho, Myeung-Hwan Chun, Ho-Sub Kim, Hyung-Mo Kim, Jung Sang Suh, Bong-Hyun Jun
Dye-sensitized solar cells (DSSCs) were fabricated using open-ended freestanding TiO₂ nanotube arrays functionalized with Ag nanoparticles (NPs) in the channel to create a plasmonic effect, and then coated with large TiO₂ NPs to create a scattering effect in order to improve energy conversion efficiency. Compared to closed-ended freestanding TiO₂ nanotube array-based DSSCs without Ag or large TiO₂ NPs, the energy conversion efficiency of closed-ended DSSCs improved by 9.21% (actual efficiency, from 5...
June 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335243/correlation-between-cdse-qd-synthesis-post-synthetic-treatment-and-bhj-hybrid-solar-cell-performance
#17
Michael Eck, Michael Krueger
In this publication we show that the procedure to synthesize nanocrystals and the post-synthetic nanocrystal ligand sphere treatment have a great influence not only on the immediate performance of hybrid bulk heterojunction solar cells, but also on their thermal, long-term, and air stability. We herein demonstrate this for the particular case of spherical CdSe nanocrystals, post-synthetically treated with a hexanoic acid based treatment. We observe an influence from the duration of this post-synthetic treatment on the nanocrystal ligand sphere size, and also on the solar cell performance...
June 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335226/improving-the-photocurrent-in-quantum-dot-sensitized-solar-cells-by-employing-alloy-pbxcd1-xs-quantum-dots-as-photosensitizers
#18
Chunze Yuan, Lin Li, Jing Huang, Zhijun Ning, Licheng Sun, Hans Ågren
Ternary alloy PbxCd1-xS quantum dots (QDs) were explored as photosensitizers for quantum-dot-sensitized solar cells (QDSCs). Alloy PbxCd1-xS QDs (Pb0.54Cd0.46S, Pb0.31Cd0.69S, and Pb0.24Cd0.76S) were found to substantially improve the photocurrent of the solar cells compared to the single CdS or PbS QDs. Moreover, it was found that the photocurrent increases and the photovoltage decreases when the ratio of Pb in PbxCd1-xS is increased. Without surface protecting layer deposition, the highest short-circuit current density reaches 20 mA/cm² under simulated AM 1...
May 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335225/enhancing-the-photocurrent-of-top-cell-by-ellipsoidal-silver-nanoparticles-towards-current-matched-gainp-gainas-ge-triple-junction-solar-cells
#19
Yiming Bai, Lingling Yan, Jun Wang, Lin Su, Zhigang Yin, Nuofu Chen, Yuanyuan Liu
A way to increase the photocurrent of top-cell is crucial for current-matched and highly-efficient GaInP/GaInAs/Ge triple-junction solar cells. Herein, we demonstrate that ellipsoidal silver nanoparticles (Ag NPs) with better extinction performance and lower fabrication temperature can enhance the light harvest of GaInP/GaInAs/Ge solar cells compared with that of spherical Ag NPs. In this method, appropriate thermal treatment parameters for Ag NPs without inducing the dopant diffusion of the tunnel-junction plays a decisive role...
May 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335223/ultraviolet-plasmonic-aluminium-nanoparticles-for-highly-efficient-light-incoupling-on-silicon-solar-cells
#20
Yinan Zhang, Boyuan Cai, Baohua Jia
Plasmonic metal nanoparticles supporting localized surface plasmon resonances have attracted a great deal of interest in boosting the light absorption in solar cells. Among the various plasmonic materials, the aluminium nanoparticles recently have become a rising star due to their unique ultraviolet plasmonic resonances, low cost, earth-abundance and high compatibility with the complementary metal-oxide semiconductor (CMOS) manufacturing process. Here, we report some key factors that determine the light incoupling of aluminium nanoparticles located on the front side of silicon solar cells...
May 24, 2016: Nanomaterials
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