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https://www.readbyqxmd.com/read/28922479/highly-conductive-and-transparent-large-area-bilayer-graphene-realized-by-mocl5-intercalation
#1
Hiroki Kinoshita, Il Jeon, Mina Maruyama, Kenji Kawahara, Yuri Terao, Dong Ding, Rika Matsumoto, Yutaka Matsuo, Susumu Okada, Hiroki Ago
Bilayer graphene (BLG) comprises a 2D nanospace sandwiched by two parallel graphene sheets that can be used to intercalate molecules or ions for attaining novel functionalities. However, intercalation is mostly demonstrated with small, exfoliated graphene flakes. This study demonstrates intercalation of molybdenum chloride (MoCl5 ) into a large-area, uniform BLG sheet, which is grown by chemical vapor deposition (CVD). This study reveals that the degree of MoCl5 intercalation strongly depends on the stacking order of the graphene; twist-stacked graphene shows a much higher degree of intercalation than AB-stacked...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28922475/a-new-passivation-route-leading-to-over-8-efficient-pbse-quantum-dot-solar-cells-via-direct-ion-exchange-with-perovskite-nanocrystals
#2
Zhilong Zhang, Zihan Chen, Lin Yuan, Weijian Chen, Jianfeng Yang, Bo Wang, Xiaoming Wen, Jianbing Zhang, Long Hu, John A Stride, Gavin J Conibeer, Robert J Patterson, Shujuan Huang
Colloidal quantum dots (QDs) are promising candidate materials for photovoltaics (PV) owing to the tunable bandgap and low-cost solution processability. Lead selenide (PbSe) QDs are particularly attractive to PV applications due to the efficient multiple-exciton generation and carrier transportation. However, surface defects arising from the oxidation of the PbSe QDs have been the major limitation for their development in PV. Here, a new passivation method for chlorinated PbSe QDs via ion exchange with cesium lead halide (Br, I) perovskite nanocrystals is reported...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28921953/new-antimony-selenide-nickel-oxide-photocathode-boosts-the-efficiency-of-graphene-quantum-dots-co-sensitized-solar-cell
#3
Ankita Kolay, Ramesh K Kokal, Ankarao Kalluri, Isaac Macwan, Prabir K Patra, Partha Ghosal, Melepurath Deepa
A novel assembly of a photocathode and photoanode is investigated to explore their complementary effects in enhancing the photovoltaic performance of a quantum dot solar cell (QDSC). While p-type nickel oxide (NiO) has been used previously, antimony selenide (Sb2Se3) has not been used in a QDSC, especially as a component of a counter electrode (CE) architecture that doubles up as the photocathode. Here, near infrared (NIR) light absorbing Sb2Se3 nanoparticles (NPs) coated over electrodeposited NiO nanofibers on a carbon (C)-fabric substrate was employed as the highly efficient photocathode...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28921949/effects-of-high-temperature-and-thermal-cycling-on-the-performance-of-perovskite-solar-cells-acceleration-of-charge-recombination-and-deterioration-of-charge-extraction
#4
Arif D Sheikh, Rahim Munir, Md Azimul Haque, Ashok Bera, Weijin Hu, Parvez Shaikh, Aram Amassian, Tom Wu
In this work, we investigated the effects of high operating temperature and thermal cycling on the photovoltaic performance of perovskite solar cells (PSCs) with a typical mesostructured (m)-TiO2-CH3NH3PbI3-xClx-spiro-OMeTAD architecture. After carrying out temperature-dependent grazing incidence wide-angle X-ray scattering (GIWAXS), in-situ X-ray diffraction (XRD) and optical absorption experiments, thermal durability of PSCs was tested by subjecting the devices to repetitive heating to 70 °C and cooling to room temperature (20 °C)...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28921947/large-scale-fabrication-of-silicon-nanowires-for-solar-energy-applications
#5
Bing-Chang Zhang, Jiansheng Jie, Xiujuan Zhang, Xue-Mei Ou, Xiao-Hong Zhang
The development of silicon (Si) materials during the past decades has boosted up the prosperity of modern semiconductor industry. In comparison with the bulk Si materials, Si nanowires (SiNWs) possess superior structural, optical and electrical properties and have attracted increasing attention in solar energy applications. To achieve the practical applications of SiNWs, both large-scale synthesis of SiNWs at low cost and rational design of energy conversion devices with high efficiency are the prerequisite...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28921883/stupendous-role-of-co-sensitizers-in-dye-sensitized-solar-cells
#6
Lingamallu Giribabu, Vamsi Krishna Narra, Venkata Suman Krishna Jonnadula, Mrinalini Madoori, Prasanthkumar Seelam
Co-sensitization in dye sensitized solar cells (DSSCs) received significant attention for improving the efficiency and stability of renewable energy resources. In this context, ruthenium metal and porphyrin dyes based DSSCs achieved increment in power conversion efficiency (PCE) from 8 - 11% to 11-14% after addition of additives, co-adsorbents and co-sensitizers by reducing the aggregation and charge recombination. Among the three supporting materials, co-sensitizers played major role to enhance the performance and stability of DSSCs which assist in commercialization...
September 16, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28921741/chalcogen-atom-annulated-perylene-diimide-trimers-for-highly-efficient-nonfullerene-polymer-solar-cells
#7
Yuwei Duan, Xiaopeng Xu, Ying Li, Zuojia Li, Qiang Peng
This communication reports the synthesis of two novel chalcogen-atom-annulated perylene diimide (PDI) trimers with twisted structures, TriPDI-S and TriPDI-Se, for efficient nonfullerene polymer solar cells. TriPDI-Se exhibits more compact molecular arrangement due to the stronger intermolecular interactions induced by the selenium atom. This selenium annulation endows TriPDI-Se with improved absorption and crystallinity in its blend film. The resulting devices exhibit enhanced Jsc of 17.15 mA cm(-2) and fill factor (FF) of 66...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28920436/rational-design-of-solution-processed-ti-fe-o-ternary-oxides-for-efficient-planar-ch3nh3pbi3-perovskite-solar-cells-with-suppressed-hysteresis
#8
Xin Li, Feng Hao, Xingyue Zhao, Xuewen Yin, Zhibo Yao, Ying Guo, Heping Shen, Hong Lin
Electron extraction layer (EEL) plays a critical role in organometal-halide perovskite solar cells (PSCs) by determining the charge extraction and ultimately their power conversion efficiencies. Here, Ti-Fe-O ternary oxide was firstly demonstrated as an efficient EEL candidate in the planar PSC, showing superiority in multiple aspects including the intrinsic precursor stability, coverage on the substrates, electrical properties, and energy levels compared to the widely used TiOx and the pure FeOx. By varying Fe content from 0% to 100% in the Ti-Fe-O composite, the conductivities of the resultant compact layers were markedly improved, according to consistent results from conductive atomic force microscopy (CAFM) and linear sweep voltammetry (LSV) measurements...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920127/incident-angle-controlled-semitransparent-colored-perovskite-solar-cells-with-improved-efficiency-exploiting-a-multilayer-dielectric-mirror
#9
Kyu-Tae Lee, Ji-Yun Jang, Sang Jin Park, Song Ah Ok, Hui Joon Park
See-through perovskite solar cells with high efficiency and iridescent colors are demonstrated by employing a multilayer dielectric mirror. A certain amount of visible light is used for wide color gamut semitransparent color generation, which can be easily tuned by changing an angle of incidence, and a wide range of visible light is efficiently reflected back toward a photoactive layer of the perovskite solar cells by the dielectric mirror for highly efficient light-harvesting performance, thus achieving 10...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28920120/c60-additive-assisted-crystallization-in-ch3nh3pb0-75sn0-25i3-perovskite-solar-cells-with-high-stability-and-efficiency
#10
Chong Liu, Wenzhe Li, Hongliang Li, Cuiling Zhang, Jiandong Fan, Yaohua Mai
The development of hybrid tin (Sn)-lead (Pb) perovskite solar cells likely tackles the toxic problem with the power conversion efficiency (PCE) exceeding 17%. However, the stability problems, e.g. hysteresis effect, degeneration and oxidation, appear to be the bottleneck that limit its further development. Here, we innovatively introduced C60 at the grain boundaries throughout the CH3NH3Pb0.75Sn0.25I3 (MAPb0.75Sn0.25I3) thin film, playing a role not only in in situ passivating the interfaces and reducing the pinholes of perovskite thin films, but also in preventing the penetration of moisture and oxygen from ambient atmosphere...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28920081/modeling-the-performance-limitations-and-prospects-of-perovskite-si-tandem-solar-cells-under-realistic-operating-conditions
#11
Moritz H Futscher, Bruno Ehrler
Perovskite/Si tandem solar cells have the potential to considerably out-perform conventional solar cells. Under standard test conditions, perovskite/Si tandem solar cells already outperform the Si single junction. Under realistic conditions, however, as we show, tandem solar cells made from current record cells are hardly more efficient than the Si cell alone. We model the performance of realistic perovskite/Si tandem solar cells under real-world climate conditions, by incorporating parasitic cell resistances, nonradiative recombination, and optical losses into the detailed-balance limit...
September 8, 2017: ACS Energy Letters
https://www.readbyqxmd.com/read/28918321/extending-donor-size-in-d-a-%C3%AF-a-organic-dye-for-dye-sensitized-solar-cells-anti-aggregation-and-improving-electron-injection
#12
Yuan-Chun Hu, Wei-Lu Ding, Xing-Liang Peng, Ze-Sheng Li
We have theoretically designed two D-A-π-A dyes 3 and 4 based on the efficient references 1 and 2 by introducing an extra electron donor unit (D2). Via calculating the electronic structures of isolated dyes, we obtain that dyes 3 and 4 possess stronger light-harvesting efficiency imparted by the fluorescence energy transfer of D2 part, maintain comparable lifetime of excited states, and shorten the electron injection time significantly with regard to 1 and 2. Meanwhile, dye 3 positively shifts the edge of virtual states of TiO2 in a larger extent compared to its counterparts...
September 8, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28917844/comparison-of-chitosan-and-chitosan-nanoparticles-on-the-performance-and-charge-recombination-of-water-based-gel-electrolyte-in-dye-sensitized-solar-cells
#13
Malihe Khalili, Mohammad Abedi, Hossein Salar Amoli, Seyed Ahmad Mozaffari
In commercialization of liquid dye-sensitized solar cells (DSSCs), whose leakage, evaporation and toxicity of organic solvents are limiting factors, replacement of organic solvents with water-based gel electrolyte is recommended. This work reports on utilizing and comparison of chitosan and chitosan nanoparticle as different gelling agents in preparation of water-based gel electrolyte in fabrication of dye sensitized solar cells. All photovoltaic parameters such as open circuit voltage (Voc), fill factor (FF), short circuit current density (Jsc) and conversion efficiency (η) were measured...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28916744/hydrogen-sulphate-based-ionic-liquid-assisted-electro-polymerization-of-pedot-catalyst-material-for-high-efficiency-photoelectrochemical-solar-cells
#14
Buket Bezgin Carbas, Mahir Gulen, Merve Celik Tolu, Savas Sonmezoglu
This work reports the facile, one-step electro-polymerization synthesis of poly (3,4-ethylenedioxythiophene) (PEDOT) using a 1-ethyl-3-methylimidazolium hydrogen sulphate (EMIMHSO4) ionic liquid (IL) and, for the first time its utilization as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). Using the IL doped PEDOT as CE, we effectively improve the solar cell efficiency to as high as 8.52%, the highest efficiency reported in 150 mC/cm(2) charge capacity, an improvement of ~52% over the control device using the bare PEDOT CE (5...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915794/genome-sequence-of-the-ectophytic-fungus-ramichloridium-luteum-reveals-unique-evolutionary-adaptations-to-plant-surface-niche
#15
Bo Wang, Xiaofei Liang, Mark L Gleason, Rong Zhang, Guangyu Sun
BACKGROUND: Ectophytic fungi occupy the waxy plant surface, an extreme environment characterized by prolonged desiccation, nutrient limitation, and exposure to solar radiation. The nature of mechanisms that facilitate adaptation to this environment remains unclear. In this study, we sequenced the complete genome of an ectophytic fungus, Ramichloridium luteum, which colonizes the surface of apple fruit, and carried out comparative genomic and transcriptome analysis. RESULTS: The R...
September 15, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28915001/design-of-donor-polymers-with-strong-temperature-dependent-aggregation-property-for-efficient-organic-photovoltaics
#16
Huawei Hu, Philip C Y Chow, Guangye Zhang, Tingxuan Ma, Jing Liu, Guofang Yang, He Yan
Bulk heterojunction (BHJ) organic solar cells (OSCs) have attracted intensive research attention over the past two decades owing to their unique advantages including mechanical flexibility, light weight, large area, and low-cost fabrications. To date, OSC devices have achieved power conversion efficiencies (PCEs) exceeding 12%. Much of the progress was enabled by the development of high-performance donor polymers with favorable morphological, electronic, and optical properties. A key problem in morphology control of OSCs is the trade-off between achieving small domain size and high polymer crystallinity, which is especially important for the realization of efficient thick-film devices with high fill factors...
September 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28914823/hole-transporting-materials-for-printable-perovskite-solar-cells
#17
REVIEW
Paola Vivo, Jagadish K Salunke, Arri Priimagi
Perovskite solar cells (PSCs) represent undoubtedly the most significant breakthrough in photovoltaic technology since the 1970s, with an increase in their power conversion efficiency from less than 5% to over 22% in just a few years. Hole-transporting materials (HTMs) are an essential building block of PSC architectures. Currently, 2,2',7,7'-tetrakis-(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene), better known as spiro-OMeTAD, is the most widely-used HTM to obtain high-efficiency devices. However, it is a tremendously expensive material with mediocre hole carrier mobility...
September 15, 2017: Materials
https://www.readbyqxmd.com/read/28914535/small-molecule-near-infrared-bodipy-donors-for-organic-tandem-solar-cells
#18
Tian-Yi Li, Toni Meyer, Zaifei Ma, Johannes Benduhn, Christian Koerner, Olaf Zeika, Koen Vandewal, Karl Leo
Three furan fused BODIPYs with a CF3 group on the meso-carbon are synthesized as near infrared (NIR) absorbing materi-als for vacuum processable organic solar cells (OSCs). The best single junction device reaches a short-circuit current (jsc) of 13.3 mA cm-2 and a power conversion efficiency (PCE) of 6.1%. These values are highly promising for an electron donor materi-al with an absorption onset beyond 900 nm. In a tandem solar cell (TSC) comprising a NIR BODIPY sub-cell and a matching "green" absorber sub-cell, complementary absorption is achieved, resulting in PCE of ~10%...
September 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28914497/fuel-production-from-seawater-and-fuel-cells-using-seawater
#19
Shunichi Fukuzumi, Yong-Min Lee, Wonwoo Nam
Seawater is the most abundant resource on our planet and fuel production from seawater has the remarkable merit that it would not compete with growing demands of pure water. This review focuses on the production of fuels from seawater and their direct use in fuel cells. Electrolysis of seawater under appropriate conditions affords hydrogen and dioxygen with 100% Faradaic efficiency without oxidation of chloride ion. Photoelectrocatalytic production of hydrogen from seawater provides promising way to produce hydrogen with low cost and high efficiency...
September 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28914323/the-spectroscopic-impact-of-interactions-with-the-four-gouterman-orbitals-from-peripheral-decoration-of-porphyrins-with-simple-electron-withdrawing-and-donating-groups
#20
Angel Zhang, Lydia Kwan, Martin J Stillman
Tetrapyrroles are of great interest for solar cell and photodynamic therapy applications due to their structural analogy with chlorophyll, a natural photosensitizer. Unsubstituted symmetric porphyrins exhibit weak absorption in the red region which makes them unsuitable for these applications. The push-pull peripheral decoration modifies the energies of the frontier molecular orbitals, which in turn influences the tetrapyrrole's spectroscopic properties. The absorption, magnetic circular dichroism, and emission spectra were measured for four zinc tetratolylporphyrin compounds substituted peripherally with a fused dimethoxybenzo group as an electron withdrawing group (EWG) on one pyrrole and on the opposite pyrrole, a single acetamido (1), a nitro (2), a proton (3), or a benzoylamino (4) substituent...
September 15, 2017: Organic & Biomolecular Chemistry
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