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https://www.readbyqxmd.com/read/28102611/realizing-small-energy-loss-of-0-55-ev-high-open-circuit-voltage-1-v-and-high-efficiency-10-in-fullerene-free-polymer-solar-cells-via-energy-driver
#1
Pei Cheng, Mingyu Zhang, Tsz-Ki Lau, Yao Wu, Boyu Jia, Jiayu Wang, Cenqi Yan, Meng Qin, Xinhui Lu, Xiaowei Zhan
A new, easy, and efficient approach is reported to enhance the driving force for charge transfer, break tradeoff between open-circuit voltage and short-circuit current, and simultaneously achieve very small energy loss (0.55 eV), very high open-circuit voltage (>1 V), and very high efficiency (>10%) in fullerene-free organic solar cells via an energy driver.
January 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28100303/ethanol-glycogen-and-glucosylglycerol-represent-competing-carbon-pools-in-ethanol-producing-cells-of-synechocystis-sp-pcc-6803-under-high-salt-conditions
#2
Nadin Pade, Stefan Mikkat, Martin Hagemann
Cyanobacteria are photoautotrophic microorganisms, which are increasingly being used as microbial cell factories to produce for example ethanol directly from solar energy and CO2. Here we analyzed the effects of different salt concentrations on an ethanol-producing strain of Synechocystis sp. PCC 6803 that over-expresses the pyruvate decarboxylase (pdc) from Zymomonas mobilis and the native alcohol dehydrogenase (adhA). Moderate salinities of 2% NaCl had no negative impact on ethanol production, whereas the addition of 4% NaCl resulted in significantly decreased ethanol yields compared to low salt conditions...
January 18, 2017: Microbiology
https://www.readbyqxmd.com/read/28099813/photoactive-donor-acceptor-composite-nanoparticles-dispersed-in-water
#3
Laurie Parrenin, Gildas Laurans, Eleni Pavlopoulou, Guillaume Fleury, Gilles Pecastaings, Cyril Brochon, Laurence Vignau, Georges Hadziioannou, Eric Cloutet
A major issue that inhibits large-scale fabrication of organic solar modules is the use of chlorinated solvents considered as toxic and hazardous. In this work, composite particles of poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2',1',3'-benzothiadiazole] (PCDTBT) and [6,6]-Phenyl C71 butyric acid methyl ester (PC71BM) were obtained in water from a versatile and a ready-to-market methodology based on miniemulsion post-polymerization. Depending on experimental conditions, size-controlled particles comprising both the electron-donor and the electron-acceptor were obtained and characterized using transmission electron microscopy (TEM), atomic force microscopic (AFM), small-angle neutron scattering (SANS), UV-visible absorption and fluorescence spectroscopies...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098975/development-of-spiro-cyclopenta-1-2-b-5-4-b-dithiophene-4-9-fluorene-based-a-%C3%AF-d-%C3%AF-a-small-molecules-with-different-acceptor-units-for-efficient-organic-solar-cells
#4
Wengong Wang, Ping Shen, Xinning Dong, Chao Weng, Guo Wang, Haijun Bin, Jing Zhang, Zhi-Guo Zhang, Yongfang Li
Three acceptor-π-donor-π-acceptor (A-π-D-π-A) small molecules (STFYT, STFRDN, and STFRCN) with spiro[cyclopenta[1,2-b:5,4-b']dithiophene-4,9'-fluorene] (STF) as the central donor unit, terthiophene as the π-conjugated bridge, indenedione, 3-ethylrhodanine, or 2-(1,1-dicyanomethylene)rhodanine as the acceptor unit are designed, synthesized and characterized as electron donor materials in solution-processing organic solar cells (OSCs). The effects of the spiro STF-based central core and different acceptors on the molecular configuration, absorption properties, electronic energy levels, carrier transport properties, the morphology of active layers, and photovoltaic properties are investigated in detail...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094911/co-dependence-between-crystalline-and-photovoltage-evolutions-in-p3ht-pcbm-solar-cells-probed-with-in-operando-giwaxs
#5
Daniel Moseguí González, Christoph J Schaffer, Stephan Pröller, Johannes Schlipf, Lin Song, Sigrid Bernstorff, Eva M Herzig, Peter Muller-Buschbaum
We address the correlation between the crystalline state of photoactive materials in model organic solar cell based on poly(3-hexylthiophen-2,5-diyl):phenyl-C60-butyric acid methyl ester (P3HT:PCBM) and the photovoltage in an in-operando investigation. I-V curves are simultaneously measured together with grazing incidence wide angle X-ray scattering probing the crystalline state of the device active layer as function of the operation time. The results show a high degree of correlation between open-circuit voltage VOC and the crystalline state of P3HT...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094830/molecular-electron-acceptors-for-efficient-fullerene-free-organic-solar-cells
#6
Shuixing Li, Zhongqiang Zhang, Minmin Shi, Chang-Zhi Li, Hongzheng Chen
Nowadays, organic solar cells (OSCs) with efficiencies over 10% have been achieved through the elaborate design of electron donors and fullerene acceptors. However, the drawbacks of fullerene acceptors, like poor absorption, limited chemical and energetic tunabilities, high-cost purification and morphological instability, have become the bottlenecks for the further improvement of OSCs. To overcome the mentioned shortages from fullerene, research studies on non-fullerene electron acceptors have boomed. To date, the highest efficiency of fullerene-free OSCs has been pushed to be 12%, which surpasses that of fullerene-based OSCs...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28094499/organic-solar-cells-with-controlled-nanostructures-based-on-microphase-separation-of-fullerene-attached-thiophene-selenophene-heteroblock-copolymers
#7
Peihong Chen, Kyohei Nakano, Kaori Suzuki, Kazuhito Hashimoto, Tomoka Kikitsu, Daisuke Hashizume, Tomoyuki Koganezawa, Keisuke Tajima
Heteroblock copolymers consisting of poly(3-hexylthiophene) and fullerene-attached poly(3-alkylselenophene) (T-b-Se-PCBP) were synthesized for organic photovoltaic applications by quasi-living catalyst transfer polycondensation and subsequent conversion reactions. Characterization of the polymers confirmed the formation of well-defined diblock structures with high loading of the fullerene at the side chain (~40 wt%). Heteroblock copolymer cast as a thin film showed a clear microphase-separated nanostructure approximately 30 nm in repeating unit after thermal annealing, which is identical to the microphase-separated nanostructure of diblock copolymer consisting of poly(3-hexylthiophene) and fullerene-attached poly(3-alkylthiophene) (T-b-T-PCBP)...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094376/cyclopentadithiophene-organic-core-in-small-molecule-organic-solar-cells-morphological-control-of-carrier-recombination
#8
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/28079979/a-general-strategy-to-enhance-the-performance-of-dye-sensitized-solar-cells-by-incorporating-light-harvesting-dye-with-hydrophobic-polydiacetylene-electrolyte-blocking-layer
#9
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/28078483/theoretical-characterization-on-photoelectric-properties-of-benzothiadiazole-and-fluorene-based-small-molecule-acceptor-materials-for-the-organic-photovoltaics
#10
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
#11
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/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/28072913/chemical-analysis-of-the-interface-in-bulk-heterojunction-solar-cells-by-x-ray-photoelectron-spectroscopy-depth-profiling
#13
Yan Busby, Emil J W List-Kratochvil, Jean-Jacques Pireaux
Despite 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. 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 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 nondestructive depth profile chemical analysis on full Al/P3HT:PCBM/PEDOT:PSS/ITO (P3HT, poly(3-hexylthiophene); PCBM, [6,6]-phenyl-C61-butyric acid methyl ester; PEDOT, poly(3,4-ethylenedioxythiophene; PSS, polystyrenesulfonate; ITO, indium tin oxide) bulk-heterojunction solar cell device stacks...
January 19, 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
#14
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/28071700/temperature-dependent-schottky-barrier-in-high-performance-organic-solar-cells
#15
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/28070837/optoelectronic-evaluation-and-loss-analysis-of-pedot-pss-si-hybrid-heterojunction-solar-cells
#16
Zhenhai Yang, Zebo Fang, Jiang Sheng, Zhaoheng Ling, Zhaolang Liu, Juye Zhu, Pingqi Gao, Jichun Ye
The organic/silicon (Si) hybrid heterojunction solar cells (HHSCs) have attracted considerable attention due to their potential advantages in high efficiency and low cost. However, as a newly arisen photovoltaic device, its current efficiency is still much worse than commercially available Si solar cells. Therefore, a comprehensive and systematical optoelectronic evaluation and loss analysis on this HHSC is therefore highly necessary to fully explore its efficiency potential. Here, a thoroughly optoelectronic simulation is provided on a typical planar polymer poly (3,4-ethylenedioxy thiophene):polystyrenesulfonate (PEDOT:PSS)/Si HHSC...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28067365/inverted-organic-solar-cells-enhanced-by-grating-coupled-surface-plasmons-and-waveguide-modes
#17
Kazuma Hara, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Akira Baba
In this study, we demonstrate improved photovoltaic properties in inverted organic thin-film solar cells by simultaneous excitation of grating-coupled surface plasmons and grating-coupled waveguide modes on gold grating surfaces. The cell consists of a glass-ITO substrate/titanium dioxide/poly(3-hexylthiophene-2,5-diyl):phenyl-C61-butyric acid methyl ester/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/gold structure. The grating structures were fabricated on P3HT:PCBM layers using a nanoimprinting technique with a PDMS stamp...
January 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28066506/reduced-voltage-losses-yield-10-efficient-fullerene-free-organic-solar-cells-with-1-v-open-circuit-voltages
#18
D Baran, T Kirchartz, S Wheeler, S Dimitrov, M Abdelsamie, J Gorman, R S Ashraf, S Holliday, A Wadsworth, N Gasparini, P Kaienburg, H Yan, A Amassian, C J Brabec, J R Durrant, I McCulloch
Optimization of the energy levels at the donor-acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically limit the open-circuit voltage (Voc) to typically less than 1 V. Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9...
December 1, 2016: Energy & Environmental Science
https://www.readbyqxmd.com/read/28062079/negligible-cytotoxicity-induced-by-different-titanium-dioxide-nanoparticles-in-fish-cell-lines
#19
Azucena Bermejo-Nogales, Mona Connolly, Philipp Rosenkranz, María-Luisa Fernández-Cruz, José M Navas
Titanium dioxide nanoparticles (TiO2-NPs) have a wide number of applications in cosmetic, solar and paint industries due to their photocatalyst and ultraviolet blocking properties. The continuous increase in the production of TiO2-NPs enhances the risk for this manufactured nanomaterial to enter water bodies through treated effluents or agricultural amendments. TiO2-NPs have shown very low toxicity in a number of aquatic organisms. However, there are no conclusive data about their deleterious effects and on their possible mechanisms of toxic action...
January 3, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28058645/efficient-organic-inorganic-hybrid-solar-cell-integrating-polymer-nanowires-and-inorganic-nanotetrapods
#20
Weizhe Xu, Furui Tan, Xiansheng Liu, Weifeng Zhang, Shengchun Qu, Zhijie Wang, Zhanguo Wang
Constructing a highly efficient bulk-heterojunction is of critical importance to the hybrid organic/inorganic solar cells. Here in this work, we introduce a novel hybrid architecture containing P3HT nanowire and CdSe nanotetrapod as bicontinuous charge channels for holes and electrons, respectively. Compared to the traditionally applied P3HT molecules, the well crystallized P3HT nanowires qualify an enhanced light absorption at the long wavelength as well as strengthened charge carrier transport in the hybrid active layer...
December 2017: Nanoscale Research Letters
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