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https://www.readbyqxmd.com/read/28097596/enhancement-of-perovskite-solar-cells-efficiency-using-n-doped-tio2-nanorod-arrays-as-electron-transfer-layer
#1
Zhen-Long Zhang, Jun-Feng Li, Xiao-Li Wang, Jian-Qiang Qin, Wen-Jia Shi, Yue-Feng Liu, Hui-Ping Gao, Yan-Li Mao
In this paper, N-doped TiO2 (N-TiO2) nanorod arrays were synthesized with hydrothermal method, and perovskite solar cells were fabricated using them as electron transfer layer. The solar cell performance was optimized by changing the N doping contents. The power conversion efficiency of solar cells based on N-TiO2 with the N doping content of 1% (N/Ti, atomic ratio) has been achieved 11.1%, which was 14.7% higher than that of solar cells based on un-doped TiO2. To get an insight into the improvement, some investigations were performed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28095594/mixed-metal-tungsten-oxide-photoanode-materials-made-by-pulsed-laser-in-liquids-synthesis
#2
Carl M Blumenfeld, Marcus Lau, Harry B Gray, Astrid M Müller
Globally scalable sunlight-driven devices that convert solar energy into storable fuels will require efficient light absorbers that are made of non-precious elements. Suitable photoanode materials are yet to be discovered. Here we utilised the timesaving nature of pulsed-laser in liquids synthesis and prepared a series of neat and mixed-metal tungsten oxide photoanode materials to investigate the effect of ad-metals on optical and photocurrent generation properties. We obtained sub-μm-sized materials with different colours from W, Al, Ta, or first-row transition metal targets in water or aqueous ammonium metatungstate solutions...
January 17, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28094922/nano-photoelectrochemical-cell-arrays-with-spatially-isolated-oxidation-and-reduction-channels
#3
Hang-Ah Park, Siyuan Liu, Youngseok Oh, Paul A Salvador, Gregory S Rohrer, Mohammad F Islam
Photoelectrochemical conversion of solar energy is explored for many diverse applications but suffers from poor efficiencies due to limited solar absorption, inadequate charge carrier separation, redox half-reactions occurring in close proximity, and/or long ion diffusion lengths. We have taken a drastically different approach to the design of photoelectrochemical cells (PECs) to spatially isolate reaction sites at the nanoscale to different materials and flow channels, suppressing carrier recombination and back-reaction of intermediates while shortening ion diffusion paths and, importantly, avoiding mixed product generation...
January 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28094376/cyclopentadithiophene-organic-core-in-small-molecule-organic-solar-cells-morphological-control-of-carrier-recombination
#4
Rocío Domínguez, Núria F Montcada, Pilar de la Cruz, Emilio Palomares, Fernando Langa
Two new planar and symmetrical A-D-A (electron acceptor-electron donor-electron acceptor) small molecules based on a commercial cyclopentadithiophene derivative have been synthesized for solution processed small molecule organic solar cells. The aim was to synthesise the molecules to be energetically identical (similar HOMO-LUMO energy levels) in order to assign the differences observed to changes in the film morphology or to differences in the interfacial recombination kinetics or both. Devices were electrically characterized under one sun simulated (1...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28094249/thermal-engineering-of-fapbi3-perovskite-material-via-radiative-thermal-annealing-and-in-situ-xrd
#5
Vanessa L Pool, Benjia Dou, Douglas G Van Campen, Talysa R Klein-Stockert, Frank S Barnes, Sean E Shaheen, Md I Ahmad, Maikel F A M van Hest, Michael F Toney
Lead halide perovskites have emerged as successful optoelectronic materials with high photovoltaic power conversion efficiencies and low material cost. However, substantial challenges remain in the scalability, stability and fundamental understanding of the materials. Here we present the application of radiative thermal annealing, an easily scalable processing method for synthesizing formamidinium lead iodide (FAPbI3) perovskite solar absorbers. Devices fabricated from films formed via radiative thermal annealing have equivalent efficiencies to those annealed using a conventional hotplate...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28092159/probe-decomposition-of-methylammonium-lead-iodide-perovskite-in-n2-and-o2-by-in-situ-infrared-spectroscopy
#6
Xiaozhou Yu, Ying Qin, Qing Peng
Packaging methylammonium lead iodide perovskite (MAPbI3) based solar cells with a controlled gaseous atmosphere, such as N2 or dry air, is a promising solution for its application as outdoor photovoltaics. However, the effect of N2 and O2 on the decomposition chemistry and kinetics of MAPbI3 is not well understood yet. With in-situ Fourier transform infrared spectroscopy measurements, we show that the effective activation energy for the degradation of MAPbI3 in N2 is ~ 120 kJ/mol. The decomposition of MAPbI3 is greatly enhanced when MAPbI3 is exposed to O2...
January 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28092135/self-supported-3d-pdcu-alloy-nanosheets-as-a-bifunctional-catalyst-for-electrochemical-reforming-of-ethanol
#7
Xiaojing Zhao, Lei Dai, Qing Qin, Fei Pei, Chengyi Hu, Nanfeng Zheng
3D PdCu alloy nanosheets exhibit enhanced electrocatalytic activity toward hydrogen evolution reaction and ethanol oxidation reaction in alkaline media. Simultaneous hydrogen and acetate production via a solar-powered cell for ethanol reforming has been fabricated using the nanosheets as bifunctional electrocatalysts. The device is promising for the production of both hydrogen and value-added chemicals using renewable energy.
January 16, 2017: Small
https://www.readbyqxmd.com/read/28091637/investigation-of-a-new-bis-carboxylate-triazole-based-anchoring-ligand-for-dye-solar-cell-chromophore-complexes
#8
Alessandro Sinopoli, Fiona A Black, Christopher J Wood, Elizabeth A Gibson, Paul I P Elliott
A novel anchoring ligand for dye-sensitised solar cell chromophoric complexes, 1-(2,2'-bipyrid-4-yl)-1,2,3-triazole-4,5-dicarboxylic acid (dctzbpy), is described. The new dye complexes [Ru(bpy)2(dctzbpy)][PF6]2 (AS16), [Ir(ppy)2(dctzbpy)][PF6] (AS17) and [Re(dctzbpy)(CO)3Cl] (AS18) were prepared in a two stage procedure with intermediate isolation of their diester analogues, AS16-Et2, AS17-Et2 and AS18-Et2 respectively. Electrochemical analysis of AS16-Et2, AS17-Et2 and AS18-Et2 reveal reduction potentials in the range -1...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091573/iron-oxide-films-prepared-by-rapid-thermal-processing-for-solar-energy-conversion
#9
B Wickman, A Bastos Fanta, A Burrows, A Hellman, J B Wagner, B Iandolo
Hematite is a promising and extensively investigated material for various photoelectrochemical (PEC) processes for energy conversion and storage, in particular for oxidation reactions. Thermal treatments during synthesis of hematite are found to affect the performance of hematite electrodes considerably. Herein, we present hematite thin films fabricated via one-step oxidation of Fe by rapid thermal processing (RTP). In particular, we investigate the effect of oxidation temperature on the PEC properties of hematite...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088853/the-formation-of-ti-h-species-at-interface-is-lethal-to-the-efficiency-of-tio2-based-dye-sensitized-devices
#10
Yan Yan, Weidong Shi, Zhen Yuan, Shenggui He, Dongmei Li, Qingbo Meng, Hongwei Ji, Chuncheng Chen, Wanhong Ma, Jincai Zhao
TiO2-based dye-sensitization cycle is one of the basic strategies for the development of solar energy applications. Although the power conversion efficiency (PCE) of dye-sensitized devices has been improved through constant attempts, the intrinsically fatal factor that leads to the complete failure of the PCE of TiO2-mediated dye-sensitized devices has not yet been determined. Here, by using isotopically labeled MAS-1H NMR, ATR-FTIR spectroscopy (separate H/D and 48Ti/49Ti experiments) and ESR, we revealed that the accumulative formation of Ti-H species on the TiO2 surface is the intrinsic cause of the PCE failure of TiO2-based dye-sensitization devices...
January 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28088847/vapor-and-gas-bubble-growth-dynamics-around-laser-irradiated-water-immersed-plasmonic-nanoparticles
#11
Yuliang Wang, Mikhail E Zaytsev, Hai Le The, Jan Cornelis Titus Eijkel, Harold J W Zandvliet, Xuehua Zhang, Detlef Lohse
Microbubbles produced by exposing water-immersed metallic nanoparticles to resonant light play an important role in novel and efficient plasmonic-enhanced processes for catalytic conversion, solar energy harvesting, biomedical imaging technique or cancer therapy. How do these bubbles form and what is their gas composition? In this article, the growth dynamics of nucleating bubbles around laser irradiated water-immersed Au plasmonic nanoparticles are studied to determine the exact origin of the occurrence and growth of these bubbles...
January 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28088119/composite-films-of-metal-doped-cos-carbon-allotropes-efficient-electrocatalyst-counter-electrodes-for-high-performance-quantum-dot-sensitized-solar-cells
#12
Seyede Sara Khalili, Hossein Dehghani, Malihe Afrooz
This study reports the enhanced catalytic ability of metal ions-doped CoS and CoS/carbon allotrope counter electrodes (CEs) (synthesized using a successive ionic layer adsorption and reaction (SILAR) method) to improve the power conversion efficiency (η) in quantum dot-sensitized solar cells (QDSSCs). Firstly, doping effects of different metal ions (Mg(2+), Ca(2+), Sr(2+) and Ba(2+)) in the CoS CE on the QDSSCs performance have been investigated. Overall, among the different metal doped CoS CEs, the best energy conversion efficiency of 2...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088091/solar-to-chemical-and-solar-to-fuel-production-from-co2-by-metabolically-engineered-microorganisms
#13
REVIEW
Han Min Woo
Recent development of carbon capture utilization (CCU) for reduction of greenhouse gas emission are reviewed. In the case of CO2 utilization, I describe development of solar-to-chemical and solar-to-fuel technology that refers to the use of solar energy to convert CO2 to desired chemicals and fuels. Photoautotrophic cyanobacterial platforms have been extensively developed on this principle, producing a diverse range of alcohols, organic acids, and isoprenoids directly from CO2. Recent breakthroughs in the metabolic engineering of cyanobacteria were reviewed...
January 11, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28081007/electronic-structure-of-alcrn-films-investigated-using-various-photoelectron-spectroscopies-and-ab-initio-calculations
#14
N Tatemizo, S Imada, Y Miura, H Yamane, K Tanaka
The valence band (VB) structures of wurtzite AlCrN (Cr concentration: 0-17.1%), which show optical absorption in the ultraviolet-visible-infrared light region, were investigated via photoelectron yield spectroscopy (PYS), x-ray/ultraviolet photoelectron spectroscopy (XPS/UPS), and ab initio density of states (DOS) calculations. An obvious photoelectron emission threshold was observed ~5.3 eV from the vacuum level for AlCrN, whereas no emission was observed for AlN in the PYS spectra. Comparisons of XPS and UPS VB spectra and the calculated DOS imply that Cr 3d states are formed both at the top of the VB and in the AlN gap...
January 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28080058/fabrication-of-pedot-nanocone-arrays-with-electrochemically-modulated-broadband-antireflective-properties
#15
Seulgi So, Han Wai Millie Fung, Kellen Kartub, Adam M Maley, Robert M Corn
Ordered nanocone arrays of the electroactive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) were fabricated by the simultaneous oxygen plasma etching of an electrodeposited PEDOT thin film coated with a hexagonally closed packed polystyrene bead monolayer. PEDOT nanocone arrays with an intercone spacing of 200 nm and an average nanocone height of 350 nm exhibited a low broadband reflectivity of <1.5% from 550 to 800 nm. Electrochemical modulation of the oxidation state of the PEDOT nanocone array film was used to change both its ex situ absorption spectrum (electrochromism) and reflection spectrum (electroreflectivity)...
January 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28079979/a-general-strategy-to-enhance-the-performance-of-dye-sensitized-solar-cells-by-incorporating-light-harvesting-dye-with-hydrophobic-polydiacetylene-electrolyte-blocking-layer
#16
Shih-Sheng Sun, Mekonnen Abebayehu Desta, Chia-Wei Liao
A unique strategy for effectively suppressing charge recombination and enhancing light harvesting in dye-sensitized solar cells (DSSCs) is demonstrated by designing a new dipolar organic dye functionalized with a diacetylene unit, which is capable of undergoing photoinduced cross-linking reaction to generate a hydrophobic polydiacetylene layer. The polydiacetylene layer serves as not only an electrolyte-blocking layer to effectively block the approaching of the oxidized redox mediator and supress the dark current but also light-harvesting role by efficient energy transfer to the dipolar dyes...
January 12, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28079971/au-la2-ti2-o7-nanostructures-sensitized-with-black-phosphorous-for-plasmon-enhanced-photocatalytic-hydrogen-production-in-visible-and-near-infrared-light
#17
Mingshan Zhu, Xiaoyan Cai, Mamoru Fujitsuka, Junying Zhang, Tetsuro Majima
Efficient utilization of solar energy is a high-priority target and the search for suitable materials as photocatalysts that not only can harvest the broad wavelength of solar light, from UV to near-infrared (NIR) region, but also can achieve high and efficient solar-to-hydrogen conversion is one of the most challenging missions. Herein, using Au/La2 Ti2 O7 (BP-Au/LTO) sensitized with black phosphorus (BP), a broadband solar response photocatalyst was designed and used as efficient photocatalyst for H2 production...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28078518/public-policy-performance-for-social-development-solar-energy-approach-to-assess-technological-outcome-in-mexico-city-metropolitan-area
#18
Angel Raúl Arenas-Aquino, Y Matsumoto-Kuwabara, M Kleiche-Dray
Mexico City Metropolitan Area (MCMA) is the most populated urban area in the country. In 2010, MCMA required 14.8% of total energy domestic demand, but greenhouse gas emissions accounted for 7.7% of domestic emissions. Mexico has massive renewable energy potential that could be harnessed through solar photovoltaic (PV) technology. The problem to explore is the relationship between local and federal public strategies in MCMA and their stance on energy transition concern, social empowerment, new technology appropriation, and the will to boost social development and urban sustainability...
January 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28078483/theoretical-characterization-on-photoelectric-properties-of-benzothiadiazole-and-fluorene-based-small-molecule-acceptor-materials-for-the-organic-photovoltaics
#19
Mingyue Sui, Shuangbao Li, Qingqing Pan, Guangyan Sun, Yun Geng
The upper efficiency of heterojunction organic photovoltaics depends on the increased open-circuit voltage (V oc) and short-circuit current (J sc). So, a higher lowest unoccupied molecular orbital (LUMO) level is necessary for organic acceptor material to possess higher V oc and more photons absorbsorption in the solar spectrum is needed for larger J sc. In this article, we theoretically designed some small molecule acceptors (2∼5) based on fluorene (F), benzothiadiazole, and cyano group (CN) referring to the reported acceptor material 2-[{7-(9,9-di-n-propyl-9H-fluoren-2-yl)benzo[c][1,2,5]thiadiazol-4-yl}methylene]malononitrile (1), the crucial parameters affecting photoelectrical properties of compounds 2∼5 were evaluated by the density functional theory (DFT) and time dependent density functional theory (TDDFT) methods...
January 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28072913/chemical-analysis-of-the-interface-in-bulk-heterojunction-solar-cells-by-xps-depth-profiling
#20
Yan Busby, Emil J W List-Kratochvil, Jean-Jacques Pireaux
Despite of the wide use of blends combining an organic p-type polymer and molecular fullerene-based electron acceptor, the proper characterization of such bulk heterojunction materials is still challenging. In order to highlight structure-to-function relations and improve the device performance, advanced tools and strategies need to be developed to characterize composition and interfaces with a sufficient accuracy. In this work, high-resolution X-ray photoelectron spectroscopy (XPS) is combined with very low energy argon ion beam sputtering to perform a non-destructive depth profile chemical analysis on full Al/P3HT:PCBM/PEDOT:PSS/ITO bulk-heterojunction solar cell device stacks...
January 10, 2017: ACS Applied Materials & Interfaces
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