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Soyun Park, Min-Sung Kim, Woongsik Jang, Jin Kuen Park, Dong Hwan Wang
Herein, solvent-treated bandgap-tunable covalent organic nanosheets (CONs) were prepared via the Stille cross-coupling reaction. These materials are considered useful as interlayers in photovoltaic devices upon the alignment of energy levels between other components. Among various types of solar cells, according to the organic-interlayer study, inverted planar perovskite solar cells (PSCs) are mostly demanded to effectively transport and collect charge carriers due to their high performance. At first, the C-V analysis proved the energy levels of the frontier orbitals for CON-10 and CON-16 nanosheets; this verified the suitability of these nanosheets as hole transport layers (HTLs) with the PEDOT:PSS upon casting both films from DMSO...
February 16, 2018: Nanoscale
Man Yu, Shuai Yuan, Hao-Yi Wang, Jia-Shang Zhao, Yujun Qin, Li-Min Fu, Jian-Ping Zhang, Xi-Cheng Ai
Organic-inorganic halide perovskites have attracted enormous attention owing to their promising application in photovoltaic devices. The morphology of the perovskites is the key to driving the performance of perovskite devices, which necessitates a systematic study. In this work, two typical morphologies, i.e., flake and cube, of perovskite films are fabricated, and the temperature-dependent optical absorption and photoluminescence properties of the two types of perovskite film are systematically investigated...
February 16, 2018: Physical Chemistry Chemical Physics: PCCP
Zhenhua Yang, Maria Moffa, Ying Liu, Hongfei Li, Luana Persano, Andrea Camposeo, Rosalba Saija, Maria Antonia Iatì, Onofrio M Maragò, Dario Pisignano, Chang-Yong Nam, Eyal Zussman, Miriam Rafailovich
Hybrid conjugated polymer/fullerene filaments based on MEH-PPV/PVP/PCBM were prepared by electrospinning, and their properties were assessed by scanning electron, atomic and lateral-force, tunneling, and confocal microscopies, as well as by attenuated-total-reflection Fourier transform infrared spectroscopy, photoluminescence quantum yield, and spatially resolved fluorescence. Highlighted features include the ribbon shape of the realized fibers and the persistence of a network serving as a template for heterogeneous active layers in solar cell devices...
February 8, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Young-Sun Jeon, Tae-Un Kim, Seon-Hoon Kim, Young-Hwan Lee, Pil-Son Choi, Kyu-Seog Hwang
Up-conversion phosphors have attracted considerable attention because of their applications in solid-state lasers, optical communications, flat-panel displays, photovoltaic cells, and biological labels. Among them, NaYF4 is reported as one of the most efficient hosts for infrared to visible photon up-conversion of Yb3+ and Er3+ ions. However, a low-temperature method is required for industrial scale fabrication of photonic and optoelectronic devices on flexible organic substrates. In this study, hexagonal β-NaYF4: 3 mol% Yb3+, 3 mol% Er3+ up-conversion phosphor using Ca2+ was prepared by chemical solution method...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Jing Ma, Jing Zhao, Weihua Ren, Bin Tang
In this study, Titanium dioxide (TiO2) microspheres were synthesized by a hydrothermal method from the same precursor: titanium sulfate. Two different TiO2 microspheres with different surface and crystallinity were fabricated by adding different additives as the photoanode of dye-sensitized solar cells (DSSCs). The growth mechanisms of the TiO2 microspheres were discussed. The effect of surface status and the crystallinity of the TiO2 microspheres on the photovoltaic characteristic of DSSCs were investigated...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Hye Ji Lee, Imas Noviyana, Maryane Putri, Chang Young Koo, Jung-A Lee, Jeong-Joo Kim, Youngjun Jeong, Youngu Lee, Hee Young Lee
IZTO20 (In0.6Zn0.2Sn0.2O1.5) ceramic target was prepared from oxide mixture of In2O3, ZnO, and SnO2 powders. IZTO20 thin films were then deposited onto glass substrate at 400 °C by DC magnetron sputtering. The average optical transmittance determined by ultraviolet-visible spectroscopy was higher than 85% for all films. The minimum resistivity of the annealed IZTO20 thin film was approximately 6.1×10-4 Ω·cm, which tended to increase with decreasing indium content. Substrate heating and annealing were found to be important parameters affecting the electrical and optical properties...
February 1, 2018: Journal of Nanoscience and Nanotechnology
David Rais, Miroslav Menšík, Bartosz Paruzel, Ivana Šeděnková, Jiří Pfleger
The localized surface plasmon (LSP) photophysical phenomenon occurring in metal nanostructures is often presented as a way to effectively couple light into sub-wavelength-scale photovoltaic devices, which would otherwise suffer from a weak light absorption. The simultaneous complementary effect of localized optical field depletion receives far less attention. We studied a system consisting of a planar gold nanoparticles array (AuNP) deposited at the surface of a semiconducting polymer thin film (P3HT). By comparing the UV-vis spectra of P3HT with and without the AuNP array, we have estimated that the AuNPs screen the optical absorption in the interfacial layer of about 3...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Liliana A A N A Truta, Felismina T C Moreira, M Goreti F Sales
Monitoring cancer biomarkers in biological fluids has become a key tool for disease diagnosis, which should be of easy access anywhere in the world. The possibility of reducing basic requirements in the field of electrochemical biosensing may open doors in this direction. This work proposes for this purpose an innovative electrochemical immunosensing system using a photovoltaic cell as an electrical reading box. Immunosensing ensures accuracy, the electrochemical-ground of the device ensures sensitivity and detectability, and the photovoltaic cell drives the system towards electrical autonomy...
February 7, 2018: Biosensors & Bioelectronics
Tao Liu, Xianmin Mai, Haijun Chen, Jing Ren, Zheting Liu, Yingxiang Li, Lina Gao, Ning Wang, Jiaoxia Zhang, Hongcai He, Zhanhu Guo
The carbon nanotube aerogel (CNA) with an ultra-low density, three-dimensional network nanostructure, superior electronic conductivity and large surface area is being widely employed as a catalytic electrode and catalytic support. Impressively, dye-sensitized solar cells (DSSCs) assembled with a CNA counter electrode (CE) achieved a maximum power conversion efficiency (PCE) of 8.28%, which exceeded that of the conventional platinum (Pt)-based DSSC (7.20%) under the same conditions. Furthermore, highly dispersed CoS 2 nanoparticles endowed with excellent intrinsic catalytic activity were hydrothermally incorporated to form a CNA-supported CoS 2 (CNA-CoS 2 ) CE, which was due to the large number of catalytically active sites and sufficient connections between CoS 2 and the CNA...
February 15, 2018: Nanoscale
Alexander Pieper, Manuel Hohgardt, Maximilian Willich, Daniel Alexander Gacek, Nour Hafi, Dominik Pfennig, Andreas Albrecht, Peter Jomo Walla
Efficient sunlight harvesting and re-directioning onto small areas has great potential for more widespread use of precious high-performance photovoltaics but so far intrinsic solar concentrator loss mechanisms outweighed the benefits. Here we present an antenna concept allowing high light absorption without high reabsorption or escape-cone losses. An excess of randomly oriented pigments collects light from any direction and funnels the energy to individual acceptors all having identical orientations and emitting ~90% of photons into angles suitable for total internal reflection waveguiding to desired energy converters (funneling diffuse-light re-directioning, FunDiLight)...
February 14, 2018: Nature Communications
Zetong Ma, Huiting Fu, Dong Meng, Wei Jiang, Yanming Sun, Zhaohui Wang
Two isomeric N-annulated perylene diimide dimers, namely p-BDNP and m-BDNP were designed and synthesized via geometric tuning. Distinct molecular geometry and packing arrangements of isomers with almost identical optical and electrochemical properities rendered us an in-depth understanding of molecular structure-aggregation state-photovoltaic performance. Blended with commercially available donor PCE-10, p-BDNP and m-BDNP showed distinct differences in photovoltaic performance with power conversion efficiencies (PCEs) of 5...
February 14, 2018: Chemistry, An Asian Journal
Toshiko Mizokuro, Nobutaka Tanigaki, Tetsuhiko Miyadera, Yousei Shibata, Tomoyuki Koganezawa
The molecular orientation of π-conjugated molecules has been reported to significantly affect the performance of organic photovoltaic devices (OPVs) based on molecular films. Hence, the control of molecular orientation is a key issue toward the improvement of OPV performance. In this research, oriented thin films of an n-type molecule, 3,4,9,10-Perylenetetracarboxylic Bisbenzimida-zole (PTCBI), were formed by deposition on in-plane oriented polythiophene (PT) films. Orientation of the PTCBI films was evaluated by polarized UV-vis spectroscopy and 2D-Grazing incidence X-ray diffraction...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Yun Jung Jang, Jihye Lee, Jeung-Hyun Jeong, Kang-Bong Lee, Donghwan Kim, Yeonhee Lee
To enhance the conversion performance of solar cells, a quantitative and depth-resolved elemental analysis of photovoltaic thin films is required. In this study, we determined the average concentration of the major elements (Cu, In, Ga, and Se) in fabricated Cu(In,Ga)Se2 (CIGS) thin films, using inductively coupled plasma atomic emission spectroscopy, X-ray fluorescence, and wavelengthdispersive electron probe microanalysis. Depth profiling results for CIGS thin films with different cell efficiencies were obtained using secondary ion mass spectrometry and Auger electron spectroscopy to compare the atomic concentrations...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Puran Pandey, Sundar Kunwar, Mao Sui, Ming-Yu Li, Quanzhen Zhang, Jihoon Lee
As a promising candidate for the improved performance, silver nanoparticles (Ag NPs) have been successfully adapted in various applications such as photovoltaics, light emitting diodes (LEDs), sensors and catalysis by taking the advantage of their controllable plasmonic properties. In this paper, the control on the morphologies and optical properties of Ag NPs on c-plane sapphire (0001) is demonstrated by the systematic control of annealing temperature (between 200 and 950 °C) with 20 and 6 nm thick Ag films through the solid state dewetting...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Panupong Sangsuriyawong, Auttasit Tubtimtae, Veeramol Vailikhit, Pichanan Teesetsopon, Supab Choopun
Manganese2+-doped copper tin telluride nanoparticles (Mn2+:Cu2SnTe3 NPs), as an absorber layer, were grown using a chemical bath deposition (CBD) technique and demonstrated for solar cell applications. The cubical structure was formed on the WO3 surface with the band gap (Eg) of Cu2SnTe3 NPs decreased from 1.80 to 1.67 eV after Mn2+ doping. The photovoltaic property at 1 sun shows the efficiency (η) of 0.276%. The η was increased with reducing sunlight intensity due to the lower carrier recombination process at an electrode and electrolyte interface, which leads to the increasing η...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Long Li, Yanqing Wang, Xinlian Deng, Linhui Nie, Zhendong Cui, Chengwu Shi
CH3NH3PbI3-xBrx thin films with different Br contents were successfully prepared on TiO2 nanorod array using 1.7 M PbI2 · DMSO complex solution and 0.465 M CH3NH3x(x = Br, I) precursors with different CH3NH3Br contents (molar ratios) by sequential deposition method. The influence of CH3NH3Br contents on the chemical composition, crystallinity, optical absorption and surface morphology of the CH3NH3PbI3-xBrx thin films was systematically investigated, and the photovoltaic performance of the corresponding TiO2 nanorod array perovskite solar cells was evaluated...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Lin Song, Tianyi Wang, Volker Körstgens, Weijia Wang, Nitin Saxena, Christoph J Schaffer, Thomas Fröschl, Nicola Hüsing, Sigrid Bernstorff, Peter Müller-Buschbaum
Hierarchically structured titania films, exhibiting interconnected foam-like nanostructures and large scale channel-type superstructures, are achieved in an energy saving way at low temperatures by a polymer template-assisted sol-gel synthesis in combination with a wet imprinting process. The surface morphology is probed with scanning electron microscopy and atomic force microscopy, while the inner morphology is characterized with grazing incidence small-angle x-ray scattering measurements. Compared to the initial hybrid films, the titania films showed reduced structure sizes caused by the polymer template removal...
February 14, 2018: ChemSusChem
Talysa Klein, Benjamin G Lee, Manuel Schnabel, Emily L Warren, Paul Stradins, Adele Tamboli, Maikel F A M van Hest
Transparent conductive adhesives (TCAs) can enable conductivity between two substrates, which is useful for a wide range of electronic devices. Here we have developed a TCA composed of polymer-particle blend with Ethylene-Vinyl Acetate as the transparent adhesive and metal-coated flexible Poly(Methyl Methacrylate) microspheres as the conductive particles that can provide conductivity and adhesion regardless of surface texture. This TCA layer was designed to be nearly transparent, conductive in only the out of plane direction, and of practical adhesive strength to hold substrates together...
February 14, 2018: ACS Applied Materials & Interfaces
Juan A Delgado-Notario, Jesus E Velazquez-Perez, Yahya M Meziani, Kristel Fobelets
Plasma waves in gated 2-D systems can be used to efficiently detect THz electromagnetic radiation. Solid-state plasma wave-based sensors can be used as detectors in THz imaging systems. An experimental study of the sub-THz response of II-gate strained-Si Schottky-gated MODFETs (Modulation-doped Field-Effect Transistor) was performed. The response of the strained-Si MODFET has been characterized at two frequencies: 150 and 300 GHz: The DC drain-to-source voltage transducing the THz radiation (photovoltaic mode) of 250-nm gate length transistors exhibited a non-resonant response that agrees with theoretical models and physics-based simulations of the electrical response of the transistor...
February 10, 2018: Sensors
Honghong Zhang, Ting Li, Zuo Xiao, Zhongli Lei, Liming Ding
Two conjugated copolymer donors, PTTABDT and PBTTABDT, based on a fused-ring azepinedione acceptor unit, 5-(2-octyldodecyl)-4H-thieno[2',3':4,5]thieno[3,2-c]thieno[2',3':4,5]thieno[2,3-e]azepine-4,6(5H)-dione (TTA), are prepared. PTTABDT possesses a conventional donor-acceptor (D-A) structure with one TTA in the repeat unit, while PBTTABDT has a D-A-A structure with two TTAs in the repeat unit. Compared with PTTABDT, PBTTABDT shows a deeper highest occupied molecular orbital (HOMO) level, a narrower bandgap, and a higher hole mobility, and exhibits better performance in bulk heterojunction solar cells...
February 13, 2018: Macromolecular Rapid Communications
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