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https://www.readbyqxmd.com/read/29342121/%C3%AE-escin-effectively-modulates-huvecs-proliferation-and-tube-formation
#1
Lenka Varinská, Lenka Fáber, Martin Kello, Eva Petrovová, Ľudmila Balážová, Peter Solár, Matúš Čoma, Peter Urdzík, Ján Mojžiš, Emil Švajdlenka, Pavel Mučaji, Peter Gál
In the present study we evaluated the anti-angiogenic activities of β-escin (the major active compound of Aesculus hippocastanum L. seeds). Human umbilical-vein endothelial cells (HUVECs) were used as an in vitro model for studying the molecular mechanism underlying the anti-angiogenic effect of β-escin. We investigated the in vitro effects on proliferation, migration, and tube formation of HUVECs and in vivo anti-angiogenic activity was evaluated in a chick chorioallantoic membrane (CAM) angiogenesis assay...
January 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29340830/fabrication-of-srge2-thin-films-on-ge-100-110-and-111-substrates
#2
T Imajo, K Toko, R Takabe, N Saitoh, N Yoshizawa, T Suemasu
Semiconductor strontium digermanide (SrGe2) has a large absorption coefficient in the near-infrared light region and is expected to be useful for multijunction solar cells. This study firstly demonstrates the formation of SrGe2 thin films via a reactive deposition epitaxy on Ge substrates. The growth morphology of SrGe2 dramatically changed depending on the growth temperature (300-700 °C) and the crystal orientation of the Ge substrate. We succeeded in obtaining single-oriented SrGe2 using a Ge (110) substrate at 500 °C...
January 16, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29340393/ferrocenyl-sulfonium-ionic-liquids-synthesis-characterization-and-electrochemistry
#3
Alexander Venker, Tobias Vollgraff, Jörg Sundermeyer
New ferrocenylsulfonium cation based ionic liquids were prepared by direct alkylation of the corresponding ferrocenyl-based thioethers with N-alkylbis(trifluoromethanesulfonyl)imides (R'TFSI). This convenient direct access to organometallic sulfonium bis(trifluoromethanesulfonyl)imide (TFSI) salts without the need for ion exchange was chosen in order to obtain highly pure and reversibly redox active room temperature ILs in many cases. In other cases the anion cation interaction in the solid state was studied by XRD analyses...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29340391/graphene-on-116-faceted-monocrystalline-anatase-nanosheet-array-for-ultraviolet-detection
#4
Yu Liu, Honglei Cai, Fangfang Wang, Jianlin Wang, Qiuping Huang, Zhengping Fu, Yalin Lu
A structure composed of a nanosheet array may trap photons, which could be used to enhance the optical response via resonances; this may be highly useful in ultraviolet (UV) detection, photocatalysis, solar cells, etc. Moreover, anatase nanosheets exposed with the active {001}, {111}, and {116} facets are promising in applications such as Li-ion battery, photocatalysis, and electrochemistry. Therefore, in this study, the {116} faceted single-crystalline anatase nanosheet array with the sheet spacing in the range of several hundred nanometers was directly grown on the transparent conductive substrates...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340377/metal-organic-frameworks-at-interfaces-of-hybrid-perovskite-solar-cells-for-enhanced-photovoltaic-properties
#5
Deli Shen, Aiying Pang, Yafeng Li, Jie Dou, Mingdeng Wei
In this study, metal-organic frameworks, as an interfacial layer, were introduced into perovskite solar cells (PSCs) for the first time. An interface modified with the metal-organic framework ZIF-8 efficiently enhanced perovskite crystallinity and grain sizes, and the photovoltaic performance of the PSCs was significantly improved, resulting in a maximum PCE of 16.99%.
January 17, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29338202/nanoscale-domain-imaging-of-all-polymer-organic-solar-cells-by-photo-induced-force-microscopy
#6
Kevin L Gu, Yan Zhou, William A Morrison, Katherine Park, Sung Park, Zhenan Bao
Rapid nanoscale imaging of the bulk heterojunction layer in organic solar cells is essential to the continued development of high-performance devices. Unfortunately, commonly used imaging techniques such as tunneling electron microscopy (TEM) and atomic force microscopy (AFM) suffer from significant drawbacks. For instance, assuming domain identity from phase contrast or topographical features can lead to inaccurate morphological conclusions. Here we demonstrate a technique known as Photo-induced Force Microscopy (PiFM) for imaging organic solar cell bulk heterojunctions with nanoscale chemical specificity...
January 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29338176/polystyrene-block-poly-ionic-liquid-copolymers-as-work-function-modifiers-in-inverted-organic-photovoltaic-cells
#7
Jong Baek Park, Mehmet Isik, Hea Jung Park, In Hwan Jung, David Mecerreyes, Do-Hoon Hwang
Interfacial layers play a critical role in building up the ohmic contact between the electrodes and functional layers in organic photovoltaic solar cells. These layers are based on either inorganic oxides (ZnO, TiO2) or water-soluble organic polymers such as poly[(9,9-dioctyl-2,7-fluorene)-alt-(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)] (PFN) and polyethylenimine ethoxylated (PEIE). In this work, we have developed a series of novel poly(ionic liquid) non-conjugated block copolymers for improving the performance of inverted organic photovoltaic cells (OPVs) by acting as work function modifiers of indium tin oxide (ITO) cathode...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29338175/limitations-of-cs3bi2i9-as-lead-free-photovoltaic-absorber-materials
#8
Biplab Ghosh, Bo Wu, Hemant Kumar Mulmudi, Claude Guet, Klaus Weber, Tze Chien Sum, Subodh G Mhaisalkar, Nripan Mathews
Lead (Pb) halide perovskites have attracted tremendous attention in recent years due to their rich optoelectronic properties, which have resulted in more than 22% power conversion efficient photovoltaics. Nevertheless, Pb-metal toxicity remains a huge hurdle for extensive applications of these compounds. Thus, alternative compounds with similar optoelectronic properties need to be developed. Bismuth possesses similar electronic structure as that of lead with the presence of ns2 electrons that exhibit rich structural variety as well as interesting optical and electronic properties...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29338174/solution-processable-zno-carbon-quantum-dots-electron-extraction-layer-for-highly-efficient-polymer-solar-cells
#9
Ruqin Zhang, Min Zhao, Zhongqiang Wang, Zongtao Wang, Bo Zhao, Yanqin Miao, Yingjuan Zhou, Hua Wang, Yuying Hao, Guo Chen, Furong Zhu
In this work, we report the effort to develop high efficiency inverted polymer solar cells (PSCs) by applying a solution processable bilayer ZnO/carbon quantum dots (C-QDs) electron extraction layer (EEL). It is shownthat the use of the bilayerEEL helps to suppress the exciton quenching by passivating the ZnO surface defects in the EEL, leading to an enhanced exciton dissociation, reduced charge recombinationand more efficient charge extraction probability, and thereby achieving high power conversion efficiency (PCE)...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29337931/real-time-spectroscopic-ellipsometry-analysis-of-first-stage-cuin1-xgaxse%C3%A2-growth-indium-gallium-selenide-co-evaporation
#10
Puja Pradhan, Puruswottam Aryal, Dinesh Attygalle, Abdel-Rahman Ibdah, Prakash Koirala, Jian Li, Khagendra P Bhandari, Geethika K Liyanage, Randy J Ellingson, Michael J Heben, Sylvain Marsillac, Robert W Collins, Nikolas J Podraza
Real time spectroscopic ellipsometry (RTSE) has been applied for in-situ monitoring of the first stage of copper indium-gallium diselenide (CIGS) thin film deposition by the three-stage co-evaporation process used for fabrication of high efficiency thin film photovoltaic (PV) devices. The first stage entails the growth of indium-gallium selenide (In1-xGax)₂Se₃ (IGS) on a substrate of Mo-coated soda lime glass maintained at a temperature of 400 °C. This is a critical stage of CIGS deposition because a large fraction of the final film thickness is deposited, and as a result precise compositional control is desired in order to achieve the optimum performance of the resulting CIGS solar cell...
January 16, 2018: Materials
https://www.readbyqxmd.com/read/29336548/judicious-design-of-cationic-cyclometalated-ir-iii-complexes-for-photochemical-energy-conversion-and-optoelectronics
#11
Isaac N Mills, Jonathan A Porras, Stefan Bernhard
The exponential growth in published studies on phosphorescent metal complexes has been triggered by their utilization in optoelectronics, solar energy conversion, and biological labeling applications. Very recent breakthroughs in organic photoredox transformations have further increased the research efforts dedicated to discerning the inner workings and structure-property relationships of these chromophores. Initially, the principal focus was on the Ru(II)-tris-diimine complex family. However, the limited photostability and lack of luminescence tunability discovered in these complexes prompted a broadening of the research to include 5d transition metal ions...
January 16, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29336500/9-9-bifluorenylidene-cored-perylene-diimide-acceptors-for-as-cast-non-fullerene-organic-solar-cells-the-isomeric-effect-on-optoelectronic-properties
#12
Yuan Zhao, Huan Wang, Shengpeng Xia, Feng Zhou, Zhenghui Luo, Jiajia Luo, Feng He, Chuluo Yang
Two different non-fullerene small molecule acceptors, named m-PIB and p-PIB based on 9,9'-bifluorenylidene (BF) and perylene diimide (PDI) were designed and synthesized. Four β-substituted PDIs were linked to 9,9'-bifluorenylidene in different positions. Based on the analysis of density function theory (DFT), p-PIB exhibited reduced intramolecular twisting between the perylene diimide moieties, more delocalized wave function and sufficiently wider π-electron delocalization compared to m-PIB. The absorption ability of p-PIB was enhanced due to the increased intermolecular interaction...
January 16, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29336353/perovskite-nanocrystals-across-dimensional-attachment-film-scale-assembly-on-flexible-substrate-and-their-fluorescence-properties
#13
Wenyi Huang, Jiajia Liu, Bing Bai, Liu Huang, Meng Xu, Jia Liu, Hongpan Rong, Jiatao Zhang
Perovskite nanocrystals (NCs), a good fluorescent candidate for excellent photoelectric properties, have opened new avenues in the fabrication of highly efficient solar cells, light-emitting diodes (LEDs), and other optoelectronic devices. Further advances will rely on the multitude of compositional, structural variants that enable the formation of lower-dimensionality layered and three-dimensional (3D) perovskites with architectural innovations. In this work, the perovskite film was fabricated on the flexible substrate by simple dip-coating technology and 3D assemblies of perovskite NCs were obtained through an attachment process...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29336155/highly-bendable-flexible-perovskite-solar-cells-on-a-nanoscale-surface-oxide-layer-of-titanium-metal-plates
#14
Gill Sang Han, Seongha Lee, Matthew Duff, Fen Qin, Jung-Kun Lee
We report highly bendable and efficient perovskite solar cells (PSCs) that use thermally oxidized layer of Ti metal plate as an electron transport layer (ETL). The power conversion efficiency (PCE) of flexible PSCs reaches 14.9 % with short-circuit current density (Jsc) of 17.9 mA/cm2, open circuit voltage (Voc) of 1.09, and fill factor (ff) of 0.74. Moreover, the Ti metal based PSCs exhibit a superior fatigue resistance over ITO/PEC substrate. Flexible PSCs maintain 100 % of their initial PCE even after PSCs are bent 1000 times at the bending radius of 4 mm...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29335181/enhancing-the-photovoltaic-performance-of-bulk-heterojunction-polymer-solar-cells-by-adding-rhodamine-b-laser-dye-as-co-sensitizer
#15
Sholeh Kazemifard, Leila Naji, Faramarz Afshar Taromi
Ternary blend (TB) strategy has been considered as an effective method to enhance the photovoltaic performance of bulk heterojunction (BHJ) polymer solar cells (PSCs). Here, we report on TB-based PSCs containing two donor materials; poly-3-hexylthiophene (P3HT) and Rhodamine B (RhB) laser organic dye, and [6,6]-phenyl C61 butyric acid methyl ester (PC61BM) as an acceptor. The influence of RhB weight percentage and injection volume was extensively studied. To gain insight into the influences of RhB on the photovoltaic performance of PSCs, physicochemical and optical properties of TBs were compared with those of BHJ binary blend as a standard...
January 5, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29334160/fine-tuning-of-molecular-packing-and-energy-level-through-methyl-substitution-enabling-excellent-small-molecule-acceptors-for-nonfullerene-polymer-solar-cells-with-efficiency-up-to-12-54
#16
Zhenghui Luo, Haijun Bin, Tao Liu, Zhi-Guo Zhang, Yankang Yang, Cheng Zhong, Beibei Qiu, Guanghao Li, Wei Gao, Dongjun Xie, Kailong Wu, Yanming Sun, Feng Liu, Yongfang Li, Chuluo Yang
A novel small molecule acceptor MeIC with a methylated end-capping group is developed. Compared to unmethylated counterparts (ITCPTC), MeIC exhibits a higher lowest unoccupied molecular orbital (LUMO) level value, tighter molecular packing, better crystallites quality, and stronger absorption in the range of 520-740 nm. The MeIC-based polymer solar cells (PSCs) with J71 as donor, achieve high power conversion efficiency (PCE), up to 12.54% with a short-circuit current (JSC ) of 18.41 mA cm-2 , significantly higher than that of the device based on J71:ITCPTC (11...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29334154/nano-titanium-monoxide-crystals-and-unusual-superconductivity-at-11-k
#17
Jijian Xu, Dong Wang, Heliang Yao, Kejun Bu, Jie Pan, Jianqiao He, Fangfang Xu, Zhanglian Hong, Xiaobo Chen, Fuqiang Huang
Nano TiO2 is investigated intensely due to extraordinary photoelectric performances in photocatalysis, new-type solar cells, etc., but only very few synthesis and physical properties have been reported on nanostructured TiO or other low valent titanium-containing oxides. Here, a core-shell nanoparticle made of TiO core covered with a ≈5 nm shell of amorphous TiO1+x is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO1+x )...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29334151/fused-tris-thienothiophene-based-electron-acceptor-with-strong-near-infrared-absorption-for-high-performance-as-cast-solar-cells
#18
Tengfei Li, Shuixing Dai, Zhifan Ke, Langxuan Yang, Jiayu Wang, Cenqi Yan, Wei Ma, Xiaowei Zhan
A fused tris(thienothiophene) (3TT) building block is designed and synthesized with strong electron-donating and molecular packing properties, where three thienothiophene units are condensed with two cyclopentadienyl rings. Based on 3TT, a fused octacylic electron acceptor (FOIC) is designed and synthesized, using strong electron-withdrawing 2-(5/6-fluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)-malononitrile as end groups. FOIC exhibits absorption in 600-950 nm region peaked at 836 nm with extinction coefficient of up to 2 × 105 m-1 cm-1 , low bandgap of 1...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333763/polymer-passivated-inorganic-cesium-lead-mixed-halide-perovskites-for-stable-and-efficient-solar-cells-with-high-open-circuit-voltage-over-1-3-v
#19
Qingsen Zeng, Xiaoyu Zhang, Xiaolei Feng, Siyu Lu, Zhaolai Chen, Xue Yong, Simon A T Redfern, Haotong Wei, Haiyu Wang, Huaizhong Shen, Wei Zhang, Weitao Zheng, Hao Zhang, John S Tse, Bai Yang
Cesium-based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (Eloss ) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2 Br absorber and polythiophene hole-acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2 Br, can significantly reduce electron-hole recombination within the perovskite, which is due to the electronic passivation of surface defect states...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333744/high-performance-organic-bulk-heterojunction-solar-cells-based-on-multiple-donor-or-multiple-acceptor-components
#20
REVIEW
Wenchao Huang, Pei Cheng, Yang Michael Yang, Gang Li, Yang Yang
Organic solar cells (OSCs) based on bulk heterojunction structures are promising candidates for next-generation solar cells. However, the narrow absorption bandwidth of organic semiconductors is a critical issue resulting in insufficient usage of the energy from the solar spectrum, and as a result, it hinders performance. Devices based on multiple-donor or multiple-acceptor components with complementary absorption spectra provide a solution to address this issue. OSCs based on multiple-donor or multiple-acceptor systems have achieved power conversion efficiencies over 12%...
January 15, 2018: Advanced Materials
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