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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
#1
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/28081494/a-cockspur-for-the-dss-cells-erythrina-crista-galli-sensitizers
#2
Paula Enciso, Jean-David Decoppet, Michael Grätzel, Michael Wörner, Franco M Cabrerizo, María Fernanda Cerdá
Dye sensitized solar cells were assembled employing a mixture of anthocyanins extracted from red ceibo's flowers. At the literature different extraction procedures are reported to extract anthocyanins from natural products and sensitize the cells. In order to compare them, different methods were followed to set the cells under the same conditions. Assembled cells showed very interesting conversion efficiency values, reaching a 0.73% value for extracts purified using C18 column, in open cells under illumination using a solar light simulator, 1 sun, 1...
January 4, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28080058/fabrication-of-pedot-nanocone-arrays-with-electrochemically-modulated-broadband-antireflective-properties
#3
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
#4
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/28079224/suitability-of-n-propanoic-acid-spiropyrans-and-spirooxazines-for-use-as-sensitizing-dyes-in-dye-sensitized-solar-cells
#5
Noah M Johnson, Yuriy Y Smolin, Daniel Hagaman, Masoud Soroush, Kenneth K S Lau, Hai-Feng Ji
This work deals with the fabrication and evaluation of color-changing dye-sensitized solar cells (DSSCs) that include N-propanoic acid-functionalized spiropyrans and spirooxazines as sensitizing dyes. We investigated the photophysical properties of these compounds in various solvents and pH conditions using UV-Vis spectroscopy, and their behavior on TiO2 photoanode surfaces using a combination of UV-Vis and FT-IR. Their performance as sensitizing dyes for DSSCs was also analyzed. This study revealed a number of unique properties for this class of compounds that affect their performance as both photochromic compounds and DSSC sensitizers, which allow for future creation of efficient photochromic DSSCs...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28079207/hysteresis-phenomena-in-perovskite-solar-cells-the-many-and-varied-effects-of-ionic-accumulation
#6
Daniel A Jacobs, Yiliang Wu, Heping Shen, Chog Barugkin, Fiona J Beck, Thomas P White, Klaus Weber, Kylie R Catchpole
The issue of hysteresis in perovskite solar cells has now been convincingly linked to the presence of mobile ions within the perovskite layer. Here we test the limits of the ionic theory by attempting to account for a number of exotic characterization results using a detailed numerical device model that incorporates ionic charge accumulation at the perovskite interfaces. Our experimental observations include a temporary enhancement in open-circuit voltage following prolonged periods of negative bias, dramatically S-shaped current-voltage sweeps, decreased current extraction following positive biasing or "inverted hysteresis", and non-monotonic transient behaviours in the dark and the light...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28078483/theoretical-characterization-on-photoelectric-properties-of-benzothiadiazole-and-fluorene-based-small-molecule-acceptor-materials-for-the-organic-photovoltaics
#7
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/28078339/simultaneous-topographical-electrical-and-optical-microscopy-of-optoelectronic-devices-at-the-nanoscale
#8
Naresh Kumar, Alina Zoladek-Lemanczyk, Anne A Y Guilbert, Weitao Su, Sachetan M Tuladhar, Thomas Kirchartz, Bob C Schroeder, Iain McCulloch, Jenny Nelson, Debdulal Roy, Fernando A Castro
Novel optoelectronic devices rely on complex nanomaterial systems where the nanoscale morphology and local chemical composition are critical to performance. However, the lack of analytical techniques that can directly probe these structure-property relationships at the nanoscale presents a major obstacle to device development. In this work, we present a novel method for non-destructive, simultaneous mapping of the morphology, chemical composition and photoelectrical properties with <20 nm spatial resolution by combining plasmonic optical signal enhancement with electrical-mode scanning probe microscopy...
January 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28076951/a-multiscale-study-of-plasmonic-scattering-and-light-trapping-effect-in-silicon-nanowire-array-solar-cells
#9
Lingyi Meng, Yu Zhang, ChiYung Yam
Nanometallic structures that support surface plasmons provide new ways to confine light at deep-subwavelength scales. In this paper, the effect of light scattering in nanowire array solar cells is studied by a multiscale approach combining classical electromagnetics (EM) and quantum mechanical (QM) simulations. A photovoltaic device is constructed by integrating a silicon nanowire array with a plasmonic silver nanosphere. The light scatterings by plasmonic element and nanowire array are obtained via classical EM simulations while current-voltage characteristics and optical properties of the nanowire cells are evaluated quantum mechanically...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28075601/nitrogen-doped-mesoporous-carbons-as-counter-electrodes-in-quantum-dot-sensitized-solar-cells-with-a-conversion-efficiency-exceeding-12
#10
Shuang Jiao, Jun Du, Zhonglin Du, Donghui Long, Wuyou Jiang, Zhenxiao Pan, Yan Li, Xinhua Zhong
The exploration of catalyst materials for counter electrode (CE) in quantum dot sensitized solar cells (QDSCs) that have both high electrocatalytic activity and low charge transfer resistance is always significant yet challenging. In this work, we report the incorporation of nitrogen heteroatoms into carbon lattices leading to nitrogen doped mesoporous carbon (N-MC) materials with superior catalytic activity when used as CE in Zn-Cu-In-Se QDSCs. A series of N-MC materials with different nitrogen contents were synthesized by colloidal silica nanocasting method...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28075560/multilayer-grown-ultrathin-nanostructured-gaas-solar-cells-as-a-cost-competitive-materials-platform-for-iii-v-photovoltaics
#11
Boju Gai, Yukun Sun, Haneol Lim, Huandong Chen, Joseph Faucher, Minjoo L Lee, Jongseung Yoon
Large-scale deployment of GaAs solar cells in terrestrial photovoltaics demands significant cost reduction for preparing device-quality epitaxial materials. Although multilayer epitaxial growth in conjunction with printing-based materials assemblies has been proposed as a promising route to achieve this goal, their practical implementation remains challenging owing to the degradation of materials properties and resulting nonuniform device performance between solar cells grown in different sequences. Here we report an alternative approach to circumvent these limitations and enable multilayer-grown GaAs solar cells with uniform photovoltaic performance...
January 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28075549/solvent-morphology-property-relationship-of-ptb7-pc71bm-polymer-solar-cells
#12
Shuai Guo, Weijia Wang, Eva M Herzig, Anna Naumann, Gregory Tainter, Jan Perlich, Peter Muller-Buschbaum
The influence of three different solvents and a solvent additive on the morphology and photovoltaic performance of bulk heterojunction films made of the copolymer based on thieno[3,4-b]thiophene-alt-benzodithiophene unit PTB7-F40 blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) is investigated. Optical microscopy and atomic force microscopy (AFM) are combined with X-ray reflectivity (XRR) and grazing incidence small and wide angle X-ray scattering (GISAXS and GIWAXS) enabling the characterization of the morphology of the whole photoactive film...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075061/constructing-post-permeation-method-to-fabricate-polymer-nanocrystals-hybrid-solar-cells-with-pce-exceeding-6
#13
Xiaohang Du, Qingsen Zeng, Gan Jin, Fangyuan Liu, Tianjiao Ji, Yuanyuan Yue, Yi Yang, Hao Zhang, Bai Yang
A post-permeation method is constructed for fabricating bulk-heterojunction hybrid solar cells. Porous CdTe film is prepared by annealing the mixture solution of aqueous CdTe nanocrystals and cetyltrimethyl ammonium bromide, after which the post-permeation of polymer is employed. By this method, kinds of polymers can be applied regardless of the intermiscibility with the nanoparticles. The inorganic nanocrystals and the polymer can be treated under respective optimized annealing temperatures, which can facilitate the growth of nanocrystals without damaging the polymers...
January 11, 2017: Small
https://www.readbyqxmd.com/read/28074957/high-efficiency-perovskite-solar-cells-prepared-by-using-a-sandwich-structure-mai-pbi2-mai-precursor-film
#14
Xuhui Zhang, Jiajiu Ye, Liangzheng Zhu, Haiying Zheng, Guozhen Liu, Xuepeng Liu, Bin Duan, Xu Pan, Songyuan Dai
Two-step deposition has been widely used in the perovskite layer preparation for perovskite solar cells due to its attractive morphology controllability. However, the limited diffusivity of CH3NH3I (MAI) might cause some PbI2 to remain in the perovskite film. The residual PbI2 in the perovskite film would lead to inferior performance of devices, such as, low power conversion efficiency (PCE), poor reproducibility and weak air stability. In this work, we developed a sandwich structure MAI-PbI2-MAI precursor film to prepare a PbI2-free CH3NH3PbI3 perovskite film...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28072913/chemical-analysis-of-the-interface-in-bulk-heterojunction-solar-cells-by-xps-depth-profiling
#15
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
https://www.readbyqxmd.com/read/28072522/evaluating-electronic-couplings-for-excited-state-charge-transfer-based-on-maximum-occupation-method-mom-%C3%AE-scf-quasi-adiabatic-states
#16
Junzi Liu, Yong Zhang, Peng Bao, Yuanping Yi
Electronic couplings of charge-transfer states with the ground state and localized excited states at the donor/acceptor interface are crucial parameters for controlling the dynamics of exciton dissociation and charge recombination processes in organic solar cells. Here we propose a quasi-adiabatic state approach to evaluate electronic couplings through combining mom-ΔSCF and state diabatization schemes. Compared with TDDFT using global hybrid functional, mom-ΔSCF is superior to estimate the excitation energies of charge-transfer states; moreover it can also provide good excited state wave functions...
January 10, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28072513/synthesis-of-graphene-oxide-based-sulphonated-oligoanilines-coatings-for-synergistically-enhanced-corrosion-protection-in-3-5-nacl-solution
#17
Hao Lu, Shengtao Zhang, Weihua Li, Yanan Cui, Tao Yang
As a vital derivative of graphene, graphene oxide (GO) is widely applied in various fields, such as transparent electrodes, solar cells, energy storage and corrosion protection due to the large specific surface area and abundant active sites. However, compared with graphene, the application of GO has been less reported in metal corrosion protection field. Therefore, in our study, 3-aminobenzenesulfonic acid (m-ABSA) was selected to combine with oligoanilines to fabricate the GO-based sulphonated oligoanilines coatings for marine corrosion protection application...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28072509/achieving-high-current-density-of-perovskite-solar-cells-by-modulating-the-dominated-facets-of-room-temperature-dc-magnetron-sputtered-tio2-electron-extraction-layer
#18
Aibin Huang, Lei Lei, Jingting Zhu, Yu Yu, Yan Liu, Songwang Yang, Shanhu Bao, Xun Cao, Ping Jin
The short circuit current density of perovskite solar cell (PSC) was boosted by modulating the dominated plane facets of TiO2 electron transport layer (ETL). Under optimized condition, TiO2 with dominant {001} facets showed (i) low incident light loss, (ii) highly smooth surface and excellent wettability for precursor solution, (iii) efficient electron extraction and (iv) high conductivity in perovskite photovoltaic application. A current density of 24.19 mA•cm-2 was achieved as a value near the maximum limit...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071700/temperature-dependent-schottky-barrier-in-high-performance-organic-solar-cells
#19
Hui Li, Dan He, Qing Zhou, Peng Mao, Jiamin Cao, Liming Ding, Jizheng Wang
Organic solar cells (OSCs) have attracted great attention in the past 30 years, and the power conversion efficiency (PCE) now reaches around 10%, largely owning to the rapid material developments. Meanwhile with the progress in the device performance, more and more interests are turning to understanding the fundamental physics inside the OSCs. In the conventional bulk-heterojunction architecture, only recently it is realized that the blend/cathode Schottky junction serves as the fundamental diode for the photovoltaic function...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28070969/sensitizers-for-aqueous-based-solar-cells
#20
Chun-Ting Li, Ryan Yeh-Yung Lin, Jiann T Lin
Aqueous dye-sensitized solar cells (DSSCs) are attractive due to sustainability and safety of using water as the solvent of the redox mediators, and possible applications of photoelectrochemical water splitting. However, higher tendency of dye-leaching by water and lower wettability of dye molecules are two major obstacles need to be tackled for future applications of aqueous DSSCs. Sensitizers designed for aqueous DSSCs are discussed based on their functions, such as modification of the molecular skeleton and the anchoring group for better stability against dye-leaching by water, and incorporation of hydrophilic entity in the dye molecule or addition of surfactant to the system to increase wettability of the dye for more facile dye regeneration...
January 10, 2017: Chemistry, An Asian Journal
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