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https://www.readbyqxmd.com/read/28230339/simultaneously-enhanced-efficiency-and-stability-of-polymer-solar-cells-by-employing-solvent-additive-and-upside-down-drying-method
#1
Qianqian Sun, Fujun Zhang, Qiaoshi An, Miao Zhang, Xiaoling Ma, Jian Zhang
The morphology of active layer plays an important role in determining the power conversion efficiency (PCE) and stability of polymer solar cells (PSCs), which strongly depends on the dynamic drying process of active layer. In this work, an efficient and universal method was developed to let active layer undergo upside-down drying process in a covered glass petri dish. For the PSCs based on PTB7-Th:PC71BM, the champion PCEs were improved from 8.58% to 9.64% by mixing 3 vol% DIO, further to 10.30% by employing upside-down drying method...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28229499/advanced-materials-for-use-in-soft-self-healing-devices
#2
REVIEW
Tan-Phat Huynh, Prashant Sonar, Hossam Haick
Devices integrated with self-healing ability can benefit from long-term use as well as enhanced reliability, maintenance and durability. This progress report reviews the developments in the field of self-healing polymers/composites and wearable devices thereof. One part of the progress report presents and discusses several aspects of the self-healing materials chemistry (from non-covalent to reversible covalent-based mechanisms), as well as the required main approaches used for functionalizing the composites to enhance their electrical conductivity, magnetic, dielectric, electroactive and/or photoactive properties...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28225257/exploiting-noncovalently-conformational-locking-as-a-design-strategy-for-high-performance-fused-ring-electron-acceptor-used-in-polymer-solar-cells
#3
Yahui Liu, Zhe Zhang, Shiyu Feng, Miao Li, Liangliang Wu, Ran Hou, Xinjun Xu, Xuebo Chen, Zhishan Bo
We have developed a kind of novel fused-ring small molecular acceptor, whose planar conformation can be locked by intramolecular noncovalent interaction. The formation of planar supramolecular fused-ring structure by conformation locking can effectively broaden its absorption spectrum, enhance the electron mobility, and reduce the nonradiative energy loss. Polymer solar cells (PSCs) based on this acceptor afforded a power conversion efficiency (PCE) of 9.6%. In contrast, PSCs based on similar acceptor, which can't form a flat conformation, only gave a PCE of 2...
February 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28225039/ruthenium-based-metallopolymer-grafted-reduced-graphene-oxide-as-a-new-hybrid-solar-light-harvester-in-polymer-solar-cells
#4
R Vinoth, S Ganesh Babu, Vishal Bharti, V Gupta, M Navaneethan, S Venkataprasad Bhat, C Muthamizhchelvan, Praveen C Ramamurthy, Chhavi Sharma, Dinesh K Aswal, Yasuhiro Hayakawa, B Neppolian
A new class of pyridyl benzimdazole based Ru complex decorated polyaniline assembly (PANI-Ru) was covalently grafted onto reduced graphene oxide sheets (rGO) via covalent functionalization approach. The covalent attachment of PANI-Ru with rGO was confirmed from XPS analysis and Raman spectroscopy. The chemical bonding between PANI-Ru and rGO induced the electron transfer from Ru complex to rGO via backbone of the conjugated PANI chain. The resultant hybrid metallopolymer assembly was successfully demonstrated as an electron donor in bulk heterojunction polymer solar cells (PSCs)...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224984/abnormal-strong-burn-in-degradation-of-highly-efficient-polymer-solar-cells-caused-by-spinodal-donor-acceptor-demixing
#5
Ning Li, José Darío Perea, Thaer Kassar, Moses Richter, Thomas Heumueller, Gebhard J Matt, Yi Hou, Nusret S Güldal, Haiwei Chen, Shi Chen, Stefan Langner, Marvin Berlinghof, Tobias Unruh, Christoph J Brabec
The performance of organic solar cells is determined by the delicate, meticulously optimized bulk-heterojunction microstructure, which consists of finely mixed and relatively separated donor/acceptor regions. Here we demonstrate an abnormal strong burn-in degradation in highly efficient polymer solar cells caused by spinodal demixing of the donor and acceptor phases, which dramatically reduces charge generation and can be attributed to the inherently low miscibility of both materials. Even though the microstructure can be kinetically tuned for achieving high-performance, the inherently low miscibility of donor and acceptor leads to spontaneous phase separation in the solid state, even at room temperature and in the dark...
February 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28221697/solution-processable-hyperbranched-conjugated-polymer-nanoparticles-based-on-c3h-symmetric-benzotrithiophene-for-polymer-solar-cells
#6
Xiaofu Wu, Zijian Zhang, Hao Hang, Yonghong Chen, Yuxiang Xu, Hui Tong, Lixiang Wang
The development of photovoltaic polymers based on C3h -symmetric benzotrithiophene (C3h -BTT), an analogue of the well-known benzodithiophene (BDT) donor unit, has been severely limited due to difficult processability. Here the authors report the preparation of solution-processable C3h -BTT-based hyperbranched conjugated polymer nanoparticles (BTT-HCPNs) with tunable particle sizes via Stille miniemulsion polymerization. Compared with the corresponding star-shaped small molecule (C3h -BTT core with three diketopyrrolopyrrole arms, BTT-3DPP) with a wide bandgap (1...
February 21, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28220757/photoexfoliation-of-two-dimensional-materials-through-continuous-uv-irradiation
#7
Wai-Chen Lin, Ming-Kai Chuang, Muchamed L Keshtov, Ganesh D Sharma, Fang-Chung Chen
This paper describes the preparation of fluorinated graphene nanosheets (FGNs) through photoexfoliation of fluorinated graphite (FG) in the liquid phase. We discovered that UV irradiation of FG dispersions in N-methyl-2-pyrolidone facilitated exfoliation to give FGNs. Transmission electron microscopy and atomic force microscopy revealed that the average thickness of the FGNs was approximately 3 nm; they were considerably thinner than the nanosheets prepared using a conventional sonication approach. Furthermore, when the FGNs were deposited uniformly onto substrates (through spin coating), they formed effective cathode interlayers for polymer solar cells (PSCs), the efficiency of which was 60% greater than that of PSCs containing FGNs prepared through ultrasonication...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28218829/kinetics-of-polymer-fullerene-phase-separation-during-solvent-annealing-studied-by-table-top-x-ray-scattering
#8
Karol Vegso, Peter Siffalovic, Matej Jergel, Peter Nadazdy, Vojtech Nádaždy, Eva Majkova
Solvent annealing is an efficient way of phase separation in polymer-fullerene blends to optimize bulk heterojunction morphology of active layer in polymer solar cells. To track the process in real time across all relevant stages of solvent evaporation, laboratory-based in-situ small- and wide-angle X-ray scattering measurements were applied simultaneously to a model P3HT:PCBM blend dissolved in dichlorobenzene. The PCBM molecule agglomeration starts at ≈7 wt% concentration of solid content of the blend in solvent...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211919/high-performance-regular-perovskite-solar-cells-employing-low-cost-poly-ethylenedioxythiophene-as-a-hole-transporting-material
#9
Xiaoqing Jiang, Ze Yu, Yuchen Zhang, Jianbo Lai, Jiajia Li, Gagik G Gurzadyan, Xichuan Yang, Licheng Sun
Herein, we successfully applied a facile in-situ solid-state synthesis of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) as a HTM, directly on top of the perovskite layer, in conventional mesoscopic perovskite solar cells (PSCs) (n-i-p structure). The fabrication of the PEDOT film only involved a very simple in-situ solid-state polymerisation step from a monomer 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) made from a commercially available and cheap starting material. The ultraviolet photoelectron spectroscopy (UPS) demonstrated that the as-prepared PEDOT film possesses the highest occupied molecular orbital (HOMO) energy level of -5...
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
#10
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/28208783/influence-of-weak-base-addition-to-hole-collecting-buffer-layers-in-polymer-fullerene-solar-cells
#11
Jooyeok Seo, Soohyeong Park, Myeonghun Song, Jaehoon Jeong, Chulyeon Lee, Hwajeong Kim, Youngkyoo Kim
We report the effect of weak base addition to acidic polymer hole-collecting layers in normal-type polymer:fullerene solar cells. Varying amounts of the weak base aniline (AN) were added to solutions of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The acidity of the aniline-added PEDOT:PSS solutions gradually decreased from pH = 1.74 (AN = 0 mol% ) to pH = 4.24 (AN = 1.8 mol %). The electrical conductivity of the PEDOT:PSS-AN films did not change much with the pH value, while the ratio of conductivity between out-of-plane and in-plane directions was dependent on the pH of solutions...
February 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28198406/plasmonic-nanomeshes-their-ambivalent-role-as-transparent-electrodes-in-organic-solar-cells
#12
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/28195372/conjugated-polymer-blends-for-organic-photovoltaics-rational-control-of-vertical-stratification-for-high-performance
#13
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/28194946/plasmonic-nanospectroscopy-for-thermal-analysis-of-organic-semiconductor-thin-films
#14
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/28194942/hydroxyl-terminated-cuins2-based-quantum-dots-potential-cathode-interfacial-modifiers-for-efficient-inverted-polymer-solar-cells
#15
Hui Chen, Pengjie Chao, Dengbao Han, Huan Wang, Jingsheng Miao, Haizheng Zhong, Hong Meng, Feng He
The use of interfacial modifiers on cathode or anode layers can effectively reduce the recombination loss and thus have potential to enhance the device performance of polymer solar cells. In this work, we demonstrated that hydroxyl-terminated CuInS2-based quantum dots could be potential cathode interfacial modifiers on ZnO layer for inverted polymer solar cells. By casting of a thin film of CuInS2-based quantum dots onto ZnO layer, the controlled devices show obvious enhancements of open-circuit voltage, short-circuit current, and fill factor...
February 20, 2017: ACS Applied Materials & Interfaces
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
#16
Jie Wang, Fei Fei, Qun Luo, Shuhong Nie, Na Wu, Xiaolian Chen, Wenming Su, Yuanjie Li, Chang-Qi Ma
Silver nanogrid 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, a highly conductive thin film coating layer, such as highly 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 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28179960/ternary-semitransparent-organic-solar-cells-with-a-laminated-top-electrode
#17
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/28160184/balanced-dipole-effects-on-interfacial-engineering-for-polymer-tio2-array-hybrid-solar-cells
#18
Fan Wu, Yanyan Zhu, Xunheng Ye, Xiaoyi Li, Yanhua Tong, Jiaxing Xu
The polymer/TiO2 array heterojunction interfacial characteristics can be tailored by balanced dipole effects through integration of TiO2-quantum dots (QDs) and N719 at heterojunction interface, resulting in the tunable photovoltaic performance. The changes of V oc with interfacial engineering originate from the shift of the conduction band (E c) edge in the TiO2 nanorod by the interfacial dipole with different directions (directed away or toward the TiO2 nanorod). The J sc improvement originates from the enhanced charge separation efficiency with an improved electronic coupling property and better charge transfer property...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28159450/laser-fabrication-of-electrical-feedthroughs-in-polymer-encapsulations-for-active-implantable-medical-devices
#19
Zara Gough, Cedric Chaminade, Philip Barclay-Monteith, Annukka Kallinen, Wenwen Lei, Rajesh Ganesan, John Grace, David R McKenzie
Hermetic electrical feedthroughs are essential for safe and functional active implantable biomedical devices and for a wide range of other applications such as batteries, supercapacitors, OLEDs and solar cells. Ceramics and metals have previously been the materials of choice for encapsulations, while polymers have advantages of ease of mass production and end user compatibility. We demonstrate a laser sealing technology that gives hermetic, mechanically strong feedthroughs with low electrical resistance in a polyetheretherketone (PEEK) encapsulation...
January 31, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28157325/deposition-and-characterization-of-roughened-surfaces
#20
Hagit Aviv, Shirly Berezin, Ortal Agai, Miri Sinwani, Yaakov R Tischler
Phase separation occurs whenever a solvent leaves a solution of strongly incompatible polymers. This can happen in a bulk and in films. Films can be tailored as substrates for multiple applications, such as solar cells, surface catalysis, and anti-reflection coatings. In this research, polystyrene (PS) was dissolved with polyvinyl acetate (PVAc) in a few different ratios using chlorobenzene as the solvent. Thin films of the different ratios were deposited on glass via spin coating. The deposited films were investigated for morphology, strain, surface area and Raman scattering...
February 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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