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https://www.readbyqxmd.com/read/28211893/superior-adsorption-and-photoinduced-carries-transfer-behaviors-of-dandelion-shaped-bi2s3-mos2-experiments-and-theory
#1
Mengjiao Li, Junyong Wang, Peng Zhang, Qinglin Deng, Jinzhong Zhang, Kai Jiang, Zhigao Hu, Junhao Chu
The enhanced light-harvesting capacity and effective separation of photogenerated carriers in fantastic hierarchical heterostructures enjoy striking attention for potential applications in the field of solar cells and photocatalysis. A three-dimensional (3D) dandelion-shaped hierarchical Bi2S3 microsphere compactly decorated with wing-shaped few layered MoS2 lamella (D-BM) was fabricated via a facile hydrothermal self-assembly process. Especially, polyethylene glycol (PEG) has been proven as the vital template to form D-BM microsphere...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211671/organic-solar-cells-based-on-wo2-72-nanowire-anode-buffer-layer-with-enhanced-power-conversion-efficiency-and-ambient-stability
#2
Longzhen You, Bin Liu, Tao Liu, Bingbing Fan, Yunhao Cai, Lin Guo, Yanming Sun
Tungsten oxide as an alternative to conventional acidic PEDOT:PSS has attracted much attention in organic solar cells (OSCs). However, the vacuum-processed WO3 layer and high temperature sol-gel hydrolyzed WOX are incompatible with large-scale manufacturing of OSCs. Here, we report for the first time that a specific tungsten oxide WO2.72 (W18O49) nanowire can function well as the anode buffer layer. The nw-WO2.72 film exhibits a high optical transparency. The power conversion efficiency (PCE) of OSCs based on three typical polymer active layers PTB7:PC71BM, PTB7-Th:PC71BM, and PDBT-T1:PC71BM with nw-WO2...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211039/cutaneous-squamous-cell-carcinoma-an-epidemiological-review
#3
REVIEW
A C Green, C M Olsen
Cutaneous squamous cell carcinoma (SCC) is a common cancer in white populations and its disease burden is often substantially underestimated. SCC occurs more often in men than women and increases dramatically with age; those affected often develop multiple primaries over time, which increases the burden. The main external cause is solar ultraviolet radiation (UVR), with immunosuppression being the other established risk factor, shown by the high SCC rates in organ transplant recipients. Sunbed use and certain genetic disorders and medical conditions are also associated with SCC, while associations with human papillomavirus infection and high bodyweight are not established...
February 16, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28209056/bulk-heterojunction-morphologies-with-atomistic-resolution-from-coarse-grain-solvent-evaporation-simulations
#4
Riccardo Alessandri, Jaakko J Uusitalo, Alex H De Vries, Remco W A Havenith, Siewert J Marrink
Control over the morphology of the active layer of bulk heterojunction (BHJ) organic solar cells is paramount to achieve high efficiency devices. However, no method currently available can predict morphologies for a novel donor:acceptor blend. An approach which allows to reach relevant length scales, retain chemical specificity, mimic experimental fabrication conditions, and which is suited for high-throughput schemes has been proven challenging to find. Here, we propose a method to generate atom-resolved morphologies of BHJs which conforms to these requirements...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28198628/protection-of-photosynthetic-algae-against-ultraviolet-radiation-by-one-step-ceo2-shellization
#5
Pengqiang Duan, Tingting Huang, Wei Xiong, Lei Shu, Yuling Yang, Changyu Shao, Xurong Xu, Weimin Ma, Ruikang Tang
Photosynthetic microalgae play an important role in solar-to-chemical energy conversion on Earth but the increasing solar ultraviolet (UV) radiation seriously reduces the biological photosynthesis. Here we developed a one-step approach to construct cell-in-shell hybrid structure by using direct adsorption of CeO2 nanoparticles onto cells. The engineered CeO2 nanoshell can efficiently protect the enclosed Chlorella cell due to its excellent UV filter property, which can also eliminate UV-induced oxidative stress...
February 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28198594/interfacial-engineering-of-perovskite-solar-cells-by-employing-a-hydrophobic-copper-phthalocyanine-derivative-as-hole-transporting-material-with-improved-performance-and-stability
#6
Ze Yu, Xiaoqing Jiang, Jianbo Lai, Yuchen Zhang, Maowei Hu, Ning Lei, Dongping Wang, Xichuan Yang, Licheng Sun
In high-performance perovskite solar cells (PSCs), hole-transporting materials (HTMs) play important roles in extracting and transporting the photo-generated holes from the perovskite absrorber to the cathode, thus reducing unwanted recombination losses and enhancing the photovoltaic performance. Herein, solution-processable tetra-4-(bis(4-tert-butyl)phenyl)amino)phenoxy-substituted copper phthalocyanine (CuPc-OTPAtBu) has been synthesized and explored as a HTM in PSCs. The optical, electrochemical and thermal properties are fully characterized for this organic metal complex...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28198406/plasmonic-nanomeshes-their-ambivalent-role-as-transparent-electrodes-in-organic-solar-cells
#7
Christian Stelling, Chetan R Singh, Matthias Karg, Tobias A F König, Mukundan Thelakkat, Markus Retsch
In this contribution, the optical losses and gains attributed to periodic nanohole array electrodes in polymer solar cells are systematically studied. For this, thin gold nanomeshes with hexagonally ordered holes and periodicities (P) ranging from 202 nm to 2560 nm are prepared by colloidal lithography. In combination with two different active layer materials (P3HT:PC61BM and PTB7:PC71BM), the optical properties are correlated with the power conversion efficiency (PCE) of the solar cells. A cavity mode is identified at the absorption edge of the active layer material...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195454/crystal-growth-and-dissolution-of-methylammonium-lead-iodide-perovskite-in-sequential-deposition-correlation-between-morphology-evolution-and-photovoltaic-performance
#8
Tsung Yu Hsieh, Chi Kai Huang, Tzu-Sen Su, Cheng-You Hong, Tzu-Chien Wei
Crystal morphology and structure are important for improving the organic-inorganic lead halide perovskite semiconductor property in optoelectronic, electronic and photovoltaic devices. In particular, crystal growth and dissolution are two major phenomena in determining the morphology of methylammonium lead iodide perovskite in the sequential deposition method for fabricating a perovskite solar cell. In this report, the effect of immersion time in the seconds step, i.e. methlyammonium iodide immersion in the morphological, structural, optical and photovoltaic evolution, is extensively investigated...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28195372/conjugated-polymer-blends-for-organic-photovoltaics-rational-control-of-vertical-stratification-for-high-performance
#9
REVIEW
Yu Yan, Xuan Liu, Tao Wang
The photoactive layer of bulk-heterojunction organic solar cells, in a thickness range of tens to hundreds of nanometers, comprises phase-separated electron donors and acceptors after solution casting. The component distribution in the cross-section of these thin films is found to be heterogeneous, with electron donors or acceptors accumulated or depleted near the electrode interfaces. This vertical stratification of the photovoltaic blend influences device metrics through its impact on charge transport and recombination, and consequently plays an important role in determining the power conversion efficiency of photovoltaic devices...
February 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28195076/energy-level-alignment-at-planar-organic-heterojunctions-influence-of-contact-doping-and-molecular-orientation
#10
Andreas Opitz
Planar organic heterojunctions are widely used in photovoltaic cells, light-emitting diodes, and bilayer field-effect transistors. The energy level alignment in the devices plays an important role in obtaining the aspired gap arrangement. Additionally, the π-orbital overlap between the involved molecules defines e.g. the charge-separation efficiency in solar cells due to charge-transfer effects. To account for both aspects, direct/inverse photoemission spectroscopy and near edge x-ray absorption fine structure spectroscopy were used to determine the energy level landscape and the molecular orientation at prototypical planar organic heterojunctions...
February 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28194946/plasmonic-nanospectroscopy-for-thermal-analysis-of-organic-semiconductor-thin-films
#11
Ferry A A Nugroho, Amaia Diaz de Zerio Mendaza, Camilla Lindqvist, Tomasz J Antosiewicz, Christian Müller, Christoph Langhammer
Organic semiconductors are key materials for the next generation thin film electronic devices like field-effect transistors, light-emitting diodes, and solar cells. Accurate thermal analysis is essential for the fundamental understanding of these materials, for device design, stability studies, and quality control because the desired nanostructures are often far from thermodynamic equilibrium and therefore tend to evolve with time and temperature. However, classical experimental techniques are insufficient because the active layer of most organoelectronic device architectures is typically only on the order of a hundred nanometers or less...
February 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192914/enhanced-efficiency-and-stability-of-perovskite-solar-cells-via-anti-solvent-treatment-in-two-step-deposition-method
#12
Minghua Li, Xiaoqin Yan, Zhuo Kang, Xinqin Liao, Yong Li, Xin Zheng, Pei Lin, Jingjing Meng, Yue Zhang
The low-cost inorganic-organic lead halide perovskite materials become particularly promising for solar cells with high photovoltaic conversion efficiency. The uniform and pinhole-free perovskite films play an important role for high-performance solar cells. We demonstrate an anti-solvent treatment by controlling the PbI2 morphology to enhance the perovskite conversion and photophysical properties, including high absorption, crystallinity and rapid carrier transfer. The fabricated perovskite solar cells show tremendous PCE improvement to about 16...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28192642/theoretical-rationalization-for-reduced-charge-recombination-in-bulky-carbazole-based-sensitizers-in-solar-cells
#13
Yaowarat Surakhot, Viktor Laszlo, Chirawat Chitpakdee, Vinich Promarak, Taweesak Sudyoadsuk, Nawee Kungwan, Tim Kowalczyk, Stephan Irle, Siriporn Jungsuttiwong
The search for greater efficiency in organic dye-sensitized solar cells (DSCs) and in their perovskite cousins is greatly aided by a more complete understanding of the spectral and morphological properties of the photoactive layer. This investigation resolves a discrepancy in the observed photoconversion efficiency (PCE) of two closely related DSCs based on carbazole-containing D-π-A organic sensitizers. Detailed theoretical characterization of the absorption spectra, dye adsorption on TiO2 , and electronic couplings for charge separation and recombination permit a systematic determination of the origin of the difference in PCE...
February 13, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28191572/graphene-quantum-dot-incorporated-perovskite-films-passivating-grain-boundaries-and-facilitating-electron-extraction
#14
Xiang Fang, Jianning Ding, Ningyi Yuan, Peng Sun, Minghang Lv, Guqiao Ding, Chong Zhu
Organic-inorganic halide perovskites have emerged as attractive materials for use in photovoltaic cells. Owing to the existence of dangling bonds at the grain boundaries between perovskite crystals, minimizing the charge recombination at the surface or grain boundaries by passivating these trap states has been identified to be one of the most important strategies for further optimization of device performance. Previous reports have mainly focused on surface passivation by inserting special materials such as graphene or fullerene between the electron transfer layer and the perovskite film...
February 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28191561/the-role-of-%C3%AF-linkers-in-tuning-the-optoelectronic-properties-of-triphenylamine-derivatives-for-solar-cell-applications-a-dft-tddft-study
#15
Murugesan Panneerselvam, Arunkumar Kathiravan, Rajadurai Vijay Solomon, Madhavan Jaccob
A recently reported triphenylamine (TPA) group in conjugation with a benzothiadiazole (BTD) moiety opens up the possibility for designing new organic sensitizers for solar cell applications that are amenable for structural tuning. Hence, seven new TPA molecules were designed from two experimentally reported molecules. The optoelectronic properties, including the absorption and emission spectra of the TPA derivatives, were studied via density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods...
February 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28186724/the-effect-of-heterocyclic-anchoring-sequence-on-the-properties-of-dithienogermole-based-solar-cells
#16
Bright Walker, Daehee Han, Mijin Moon, Song Yi Park, Ka-Hyun Kim, Jin Young Kim, Changduk Yang
The synthesis and characterization of two new small molecular donor materials, DTGe(ThFBTTh2)2 and DTGe(FBTTh3)2 are presented for application in organic solar cells. These two materials represent structural evolutions of the high-efficiency, dithienogermole (DTGe)-cored small molecule DTGe(FBTTh2)2, in which the conjugation length in the backbone was extended by incorporating additional thiophene units. Using the same molecular framework, we have evaluated how the anchoring sequence of heterocyclic units influences material properties and function in solar cell devices...
February 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28185455/charge-injection-mechanism-at-heterointerfaces-in-ch3nh3pbi3-perovskite-solar-cells-revealed-by-simultaneous-time-resolved-photoluminescence-and-photocurrent-measurements
#17
Taketo Handa, David M Tex, Ai Shimazaki, Atsushi Wakamiya, Yoshihiko Kanemitsu
Organic-inorganic hybrid perovskite solar cells are attracting much attention due to their excellent photovoltaic properties. In these multi-layered structures, the device performance is determined by complicated carrier dynamics. Here, we studied photocarrier recombination and injection dynamics in CH3NH3PbI3 perovskite solar cells using time-resolved photoluminescence (PL) and photocurrent (PC) measurements. It is found that a peculiar slowdown in the PL decay time constants of the perovskite layer occurs for higher excitation powers, followed by a decrease of the external quantum efficiency for PC...
February 10, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28185453/modification-of-the-highly-conductive-pedot-pss-layer-for-use-in-silver-nanogrid-electrodes-for-flexible-inverted-polymer-solar-cells
#18
Jie Wang, Fei Fei, Qun Luo, Shuhong Nie, Na Wu, Xiaolian Chen, Wenming Su, Yuanjie Li, Chang-Qi Ma
Silver nano-grid based flexible transparent electrode is recognized as the most promising alternative to ITO electrode for organic electronics, owing to its low production cost and excellent flexibility. Typically, high conductive thin film coating layer, such as high conductive PEDOT:PSS (HC-PEDOT:PSS) is usually deposited onto the Ag-grid electrode to smooth the surface and to minimize the sheet resistance. In this paper, we found that inverted flexible polymer solar cells with structure of Ag-grid/HC-PEDOT:PSS/ZnO/photoactive layer/MoO3/Al generally exhibits strong S-shaped J-V curves, which could be eliminated by light-soaking treatment...
February 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28179960/ternary-semitransparent-organic-solar-cells-with-a-laminated-top-electrode
#19
Mohammed Makha, Paolo Testa, Surendra Babu Anantharaman, Jakob Heier, Sandra Jenatsch, Nicolas Leclaire, Jean-Nicolas Tisserant, Anna C Véron, Lei Wang, Frank Nüesch, Roland Hany
Tinted and colour-neutral semitransparent organic photovoltaic elements are of interest for building-integrated applications in windows, on glass roofs or on facades. We demonstrate a semitransparent organic photovoltaic cell with a dry-laminated top electrode that achieves a uniform average visible transmittance of 51% and a power conversion efficiency of 3%. The photo-active material is based on a majority blend composed of a visibly absorbing donor polymer and a fullerene acceptor, to which a selective near-infrared absorbing cyanine dye is added as a minority component...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/28178798/geminate-electron-hole-recombination-in-organic-photovoltaic-cells-a-semi-empirical-theory
#20
Mariusz Wojcik, Artur Nowak, Kazuhiko Seki
We propose a semi-empirical theory which describes the geminate electron-hole separation probability in both homogeneous systems and donor-acceptor heterojunction systems applicable in organic photovoltaics. The theory is based on the results of extensive simulation calculations, which were carried out using various lattice models of the medium and different charge-carrier hopping mechanisms, over the parameter ranges typical for organic solar cells. It is found that the electron-hole separation probability can be conveniently described in terms of measurable parameters by a formula whose functional form is derived from the existing recombination theories, and which contains only one empirical parameter...
February 7, 2017: Journal of Chemical Physics
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