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https://www.readbyqxmd.com/read/28636260/lichenoid-keratosis-is-frequently-misdiagnosed-as-basal-cell-carcinoma
#1
D Maor, C Ondhia, L L Yu, J J Chan
Lichenoid keratosis (LK), also known as benign lichenoid keratosis or lichen planus-like keratosis, is a solitary, pink to red-brown scaly plaque representing a host immunological response to a variety of precursor lesions. LK is often misdiagnosed as a dermatological malignancy owing to its clinical resemblance to basal cell carcinoma (BCC) or Bowen disease. We performed a retrospective analysis of the pathology records of a series of LK lesions with reference to the demographic features and accuracy of clinical diagnosis...
June 21, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28634601/an-annealing-free-aqueous-processed-anatase-tio2-compact-layer-for-efficient-planar-heterojunction-perovskite-solar-cells
#2
Chengwu Yang, Mingyu Yu, Dichun Chen, Yaqing Zhou, Wei Wang, Yang Li, Tung-Chun Lee, Daqin Yun
A facile aqueous-based fabrication scheme is developed for producing annealing-free anatase TiO2 (AF-TiO2) films that exhibit efficient electron transport properties in planar heterojunction perovskite solar cells (PSCs). AF-TiO2 films are fabricated by spin coating on a substrate a colloidal solution of anatase TiO2 nanoparticles (NPs) prepared via a low temperature hydrolytic sol-gel method. The resultant AF-TiO2 films show low electrical resistance, high transmittance in the visible and near-infrared regions and facilitation of high-quality perovskite film formation, which can be attributed to their homogeneous surface morphology and nanocrystallinity...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631466/enhancing-the-performance-of-polymer-solar-cells-by-using-donor-polymers-carrying-discretely-distributed-side-chains
#3
Xue Gong, Guangwu Li, Yang Wu, Jicheng Zhang, Shiyu Feng, Yahui Liu, Cuihong Li, Wei Ma, Zhishan Bo
Three-component conjugated polymers P1-1 and P1-2 were prepared by one-pot Stille cross-coupling reaction and applied for polymer solar cell (PSCs). The two-component polymer P1-0 only comprises 5-flouro-6-alkyloxybenzothiadiazole (AFBT) acceptor unit and thiophene donor unit; while the three-component polymers P1-1 and P1-2 contain 10% and 20% 5,6-difluorobenzothiadiazole (DFBT), respectively, as the third component. The incorporation of the third component, 5,6-difluorobenzothiadiazole, makes the side chains discretely distributed in the polymer backbones, which can enhance the π-π stacking of polymers in film, markedly increase the hole mobility of active layers, and improve the power conversion efficiency (PCE) of devices...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631465/an-interfacial-investigation-on-printable-carbon-based-mesoscopic-perovskite-solar-cells-with-niox-c-back-electrode
#4
Fatemeh Behrouznejad, Cheng-Min Tsai, Sudhakar Narra, Eric W-G Diau, Nima Taghavinia
Solar cells with high-efficiency, low-cost and high-stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multi-layer mesoporous structure...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631405/a-perylene-based-polycyclic-aromatic-hydrocarbon-electron-donor-for-a-highly-efficient-solar-cell-dye
#5
Junting Wang, Heng Wu, Linrui Jin, Jing Zhang, Yi Yuan, Peng Wang
The continuing efforts of creating novel polycyclic aromatic hydrocarbons (PAHs) and exploiting them as the crucial building-blocks of organic donor-acceptor (D-A) dyes with excellent excited state features, should bring an unprecedented chance for the improvement of power conversion efficiency (PCE) of dye-sensitized solar cells (DSCs). In this paper we report a nonacyclic aromatic hydrocarbon, N-annulated benzoindenopentaphene (NBIP), which can be tethered with multiple solubilizing groups including one 2-hexyldecyl, one 2-hexyldecyloxy, and four 4-hexylphenyl substituents...
June 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28631338/cross-linkable-and-dual-functional-hybrid-polymeric-electron-transporting-layer-for-high-performance-inverted-polymer-solar-cells
#6
Sheng Dong, Zhicheng Hu, Kai Zhang, Qingwu Yin, Xiaofang Jiang, Fei Huang, Yong Cao
A cross-linkable dual functional polymer hybrid electron transport layer (ETL) is developed by simply adding an amino-functionalized polymer dopant (PN4N) and a light crosslinker into a commercialized n-type semiconductor (N2200) matrix. It is found that the resulting hybrid ETL not only has a good solvent resistance, facilitating multilayers device fabrication but also exhibits much improved electron transporting/extraction properties due to the doping between PN4N and N2200. As a result, by using PTB7-Th:PC71 BM blend as an active layer, the inverted device based on the hybrid ETL can yield a prominent power conversion efficiency of around 10...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28629074/tunable-green-graphene-silk-biomaterials-mechanism-of-protein-based-nanocomposites
#7
Fang Wang, S S Jyothirmayee Aravind, Hao Wu, Joseph Forys, Venkat Venkataraman, Kandalam Ramanujachary, Xiao Hu
Green graphene materials prepared by photoreduction of graphite oxide were first time blended with aqueous-based silk fibroin proteins to improve the mechanical and thermal properties of silk biomaterials, and their nanocomposite interaction mechanism was illustrated. Powder X-ray diffraction (XRD) analysis confirmed the complete exfoliation of graphite oxide to graphene in presence of focused pulses of solar radiation. By varying the concentration of graphene (0.1wt% to 10wt%), a series of free standing graphene-silk films were prepared and were systematically characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and nanoindentation measurements...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628301/the-effect-of-fluorine-substitution-on-the-molecular-interactions-and-performance-in-polymer-solar-cells
#8
In-Bok Kim, Soo-Young Jang, Yeong-A Kim, Rira Kang, In-Sik Kim, Do-Kyeong Ko, Dong-Yu Kim
Fluorine (F) substitution on conjugated polymers in polymer solar cells (PSCs) has a diverse effect on molecular properties and device performance. We present a series of three D-A type conjugated polymers (PBT, PFBT and PDFBT) based on dithienothiophene and benzothiadiazole units with different numbers of F atoms to explain the influence of F substitution by comparing the molecular interac-tions of the polymers and the recombination kinetics in PSCs. The pre-aggregation behavior of PFBT and PDFBT in o-DCB at the UV-Vis absorption spectra proves that both polymers have strong intermolecular interactions...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28627744/femtosecond-charge-injection-dynamics-at-hybrid-perovskite-interfaces
#9
Giulia Grancini, Daniele Viola, Yonghui Lee, Michael Saliba, Sanghyun Paek, Kyung Taek Cho, Simonetta Orlandi, Marco Cavazzini, Fernando Fungo, Mohammad I Hossain, Abdelhak Belaidi, Nouar Tabet, Gianluca Pozzi, Giulio Cerullo, Mohammad Khaja Khaja Nazeeruddin
With power conversion efficiency (PCE) exceeding 22%, perovskite solar cells (PSCs) have thrilled the photovoltaic research. However, interface behavior is still not understood and a hot subject of research: different processes occur over a hierarchy of timescales, from femtoseconds to seconds, making the perovskite interface physics intriguing. Here, by femtosecond transient absorption spectroscopy with spectral coverage extended to the crucial IR region, we interrogate the ultrafast interface- specific processes at standard as well as newly molecularly-engineered perovskite interfaces used in state of the art PSCs...
June 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28627165/room-temperature-processed-nb2o5-as-the-electron-transporting-layer-for-efficient-planar-perovskite-solar-cells
#10
Xufeng Ling, Jianyu Yuan, Dongyang Liu, Yongjie Wang, Yannan Zhang, Si Chen, Haihua Wu, Feng Jin, Fu-Peng Wu, Guozheng Shi, Xun Tang, Jiawei Zheng, Shengzhong Frank Liu, Zhike Liu, Wanli Ma
In this work , we demonstrate high-efficiency planar perovskite solar cells (PSCs) using room-temperature sputtered niobium oxide (Nb2O5) as the electron transporting layer (ETL). Widely spread ETL like TiO2 often requires high-temperature (> 450 ºC) sintering, which is not desired for the fabrication of flexible devices. The as sputtered amorphous Nb2O5 ETL (labeled as a-Nb2O5) without any heat treatment can lead to a best power conversion efficiency (PCE) of 17.1% for planar PSCs. Interestingly, the crystalline Nb2O5 (labeled as c-Nb2O5) with high-temperature (500 ºC) annealing results in very similar PCE of 17...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621932/high-efficiency-quantum-dot-sensitized-solar-cells-based-on-direct-adsorption-of-quantum-dots-on-photoanodes
#11
Wenran Wang, Guocan Jiang, Juan Yu, Wei Wang, Zhenxiao Pan, Naoki Nakazawa, Qing Shen, Xinhua Zhong
Unambiguously direct adsorption (DA) of initial oil-soluble QDs on TiO2 film electrode is a convenient and simple approach in the construction of quantum dot sensitized solar cells (QDSCs). Regrettably, low QD loading amount and poor reproducibility shadow the advantages of DA route and constrain its practical application. Herein, the influence of experimental variables in DA process on QD loading amount as well as on the photovoltaic performance of the resultant QDSCs were investigated and optimized systematically, including the choice of solvent, purification of QDs, sensitization time, as well as QD concentration...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621922/selective-organic-contacts-for-methyl-ammonium-lead-iodide-mapi-perovskite-solar-cells-influence-of-layer-thickness-on-carriers-extraction-and-carriers-lifetime
#12
Ilario Gelmetti, Lydia Cabau, Nuria F Montcada, Emilio Palomares
We have fabricated MAPI solar cells using as selective contacts PEDOT:PSS polymer for holes and PCBM-C70 fullerene derivative for electrons. The thickness of MAPI, PCBM-C70, and PEDOT:PSS layers have been varied in order to evaluate the contribution of each layer to the final device performance. We have measured the devices capacitance under illumination and the charge carrier's lifetime using photo-induced time resolved techniques. The results show that in this kind of devices the limiting layer is the PCBM-C70 due to its relative reduced mobility compared to PEDOT:PSS that makes the control of the fullerene thickness crucial for device optimization...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621356/dye-sensitized-lanthanide-doped-upconversion-nanoparticles
#13
Xindong Wang, Rashid R Valiev, Tymish Y Ohulchanskyy, Hans Ågren, Chunhui Yang, Guanying Chen
Lanthanide-doped upconversion nanoparticles (UCNPs) are promising for applications as wide as biological imaging, multimodal imaging, photodynamic therapy, volumetric displays, and solar cells. Yet, the weak and narrow absorption of lanthanide ions poses a fundamental limit of UCNPs to withhold their brightness, creating a long-standing hurdle for the field. Dye-sensitized UCNPs are emerging to address this performance-limiting problem, yielding up to thousands-fold brighter luminescence than conventional UCNPs without dye sensitization...
June 16, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28621140/long-lived-photoinduced-polarons-in-organohalide-perovskites
#14
Tanja Ivanovska, Chiara Dionigi, Edoardo Mosconi, Filippo De Angelis, Fabiola Liscio, Vittorio Morandi, Giampiero Ruani
Charge carriers' long diffusion length in the CH3NH3PbI3 perovskite is one of the most relevant properties for explaining the high photovoltaic efficiency of perovskites solar cells. As possible mechanism for the large diffusion length of electrons and holes, several authors suggested a reduced coulomb attraction of the carriers due to the formation of polarons. Here we performed continuous wave far infrared photoinduced absorption (PIA) experiments on CH3NH3PbI3; spectral changes are associated to local deformation of the lattice around the photogenerated long lived charges, a typical signature of photo-induced polarons...
June 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28618719/a-short-progress-report-on-high-efficiency-perovskite-solar-cells
#15
REVIEW
He Tang, Shengsheng He, Chuangwei Peng
Faced with the increasingly serious energy and environmental crisis in the world nowadays, the development of renewable energy has attracted increasingly more attention of all countries. Solar energy as an abundant and cheap energy is one of the most promising renewable energy sources. While high-performance solar cells have been well developed in the last couple of decades, the high module cost largely hinders wide deployment of photovoltaic devices. In the last 10 years, this urgent demand for cost-effective solar cells greatly facilitates the research of solar cells...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618716/rf-electromagnetic-field-treatment-of-tetragonal-kesterite-cztsse-light-absorbers
#16
Mykola O Semenenko, Ivan S Babichuk, Oleksandr Kyriienko, Ivan V Bodnar, Raquel Caballero, Maximo Leon
In this work, we propose a method to improve electro-optical and structural parameters of light-absorbing kesterite materials. It relies on the application of weak power hydrogen plasma discharges using electromagnetic field of radio frequency range, which improves homogeneity of the samples. The method allows to reduce strain of light absorbers and is suitable for designing solar cells based on multilayered thin film structures. Structural characteristics of tetragonal kesterite Cu2ZnSn(S, Se)4 structures and their optical properties were studied by Raman, infrared, and reflectance spectroscopies...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28616037/correlation-between-photoreceptor-injury-regeneration-and-behavior-in-a-zebrafish-model
#17
Ya-Jie Wang, Shi-Jiao Cai, Jian-Lin Cui, Yang Chen, Xin Tang, Yu-Hao Li
Direct exposure to intensive visible light can lead to solar retinopathy, including macular injury. The signs and symptoms include central scotoma, metamorphopsia, and decreased vision. However, there have been few studies examining retinal injury due to intensive light stimulation at the cellular level. Neural network arrangements and gene expression patterns in zebrafish photoreceptors are similar to those observed in humans, and photoreceptor injury in zebrafish can induce stem cell-based cellular regeneration...
May 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28614655/novel-integration-of-perovskite-solar-cell-and-supercapacitor-based-on-carbon-electrode-for-hybridizing-energy-conversion-and-storage
#18
Zhiyong Liu, Yan Zhong, Bo Sun, Xingyue Liu, Jinghui Han, Tielin Shi, Zirong Tang, Guanglan Liao
Power packs integrating both photovoltaic parts and energy storage parts have gained great scientific and technological attention due to the increasing demand for green energy and the tendency for miniaturization and multi-functionalization in electronics industry. In this study we demonstrate novel integration of perovskite solar cell and solid-state supercapacitor for power packs. Perovskite solar cell is integrated with the supercapacitor based on the common carbon electrodes to hybridize photoelectric conversion and energy storage...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28613909/engineering-the-size-distributions-of-ordered-gaas-nanowires-on-silicon
#19
Jelena Vukajlovic-Plestina, Wonjong Kim, Vladimir G Dubrovskii, Gözde Tütüncüoglu, Maxime Lagier, Heidi Potts, Martin Friedl, Anna Fontcuberta I Morral
Reproducible integration of III-V semiconductors on silicon can open new path toward CMOS compatible optoelectronics and novel design schemes in next generation solar cells. Ordered arrays of nanowires could accomplish this task, provided they are obtained in high yield and uniformity. In this work, we provide understanding on the physical factors affecting size uniformity in ordered GaAs arrays grown on silicon. We show that the length and diameter distributions in the initial stage of growth are not much influenced by the Poissonian fluctuation-induced broadening, but rather are determined by the long incubation stage...
June 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28613842/correction-to-effects-of-additives-on-the-morphology-of-solution-phase-aggregates-formed-by-active-layer-components-of-high-efficiency-organic-solar-cells
#20
Sylvia J Lou, Jodi M Szarko, Tao Xu, Luping Yu, Tobin J Marks, Lin X Chen
No abstract text is available yet for this article.
June 14, 2017: Journal of the American Chemical Society
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