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https://www.readbyqxmd.com/read/28525677/nonlinear-optical-properties-of-sodium-copper-chlorophyllin-in-aqueous-solution
#1
Jiangting Li, Yufeng Peng, Xueyun Han, Shaoshuai Guo, Kunning Liang, Minggao Zhang
BACKGROUND: Sodium copper chlorophyllin (SCC), as one of the derivatives of chlorophyll - with its inherent green features; good stability for heat, light, acids and alkalies; unique antimicrobial capability; and particular deodori zation performance - is widely applied in some fields such as the food industry, medicine and health care, daily cosmetic industry etc. SCC, as one of the metal porphyrins, has attracted much attention because of its unique electronic band structure and photon conversion performance...
May 19, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28524262/thermally-stable-mapbi3-perovskite-solar-cells-with-efficiency-of-19-19-and-area-over-1-cm-2-achieved-by-additive-engineering
#2
Yongzhen Wu, Fengxian Xie, Han Chen, Xudong Yang, Huimin Su, Molang Cai, Zhongmin Zhou, Takeshi Noda, Liyuan Han
Solution-processed perovskite (PSC) solar cells have achieved extremely high power conversion efficiencies (PCEs) over 20%, but practical application of this photovoltaic technology requires further advancements on both long-term stability and large-area device demonstration. Here, an additive-engineering strategy is developed to realize a facile and convenient fabrication method of large-area uniform perovskite films composed of large crystal size and low density of defects. The high crystalline quality of the perovskite is found to simultaneously enhance the PCE and the durability of PSCs...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28524245/towards-efficient-spectral-converters-through-materials-design-for-luminescent-solar-devices
#3
REVIEW
Barry McKenna, Rachel C Evans
Single-junction photovoltaic devices exhibit a bottleneck in their efficiency due to incomplete or inefficient harvesting of photons in the low- or high-energy regions of the solar spectrum. Spectral converters can be used to convert solar photons into energies that are more effectively captured by the photovoltaic device through a photoluminescence process. Here, recent advances in the fields of luminescent solar concentration, luminescent downshifting, and upconversion are discussed. The focus is specifically on the role that materials science has to play in overcoming barriers in the optical performance in all spectral converters and on their successful integration with both established (e...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28523742/bandgap-engineering-of-lead-free-double-perovskite-cs2agbibr6-through-trivalent-metal-alloying
#4
Kezhao Du, Weiwei Meng, Xiaoming Wang, Yanfa Yan, David B Mitzi
The double perovskite family, A2MIMIIIX6, represents a promising route to overcome the lead toxicity issue confronting current photovoltaic (PV) standout, CH3NH3PbI3. Given the generally large indirect bandgap within most known double perovskites, bandgap engineering provides an important approach for targeting outstanding PV performance within this family. Using Cs2AgBiBr6 as host, we demonstrate bandgap engineering through alloying of InIII/SbIII. Cs2Ag(Bi1-xMx)Br6 (M = In, Sb) accommodates up to 75% InIII with increased bandgap, and up to 37...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28520164/transition-metal-chalcogenides-graphene-ensembles-for-light-induced-energy-applications
#5
Antonia Kagkoura, Theodosis Skaltsas, Nikos Tagmatarchis
Recently, nanomaterials that harvest solar energy and convert it to other forms of energy are of great interest. In this context, transition metal chalcogenides (TMCs) are lately on the spotlight due to their optoelectronic properties that render them potential candidates mainly in energy conversion applications. Integration of TMCs onto a strong electron accepting material, such as graphene, yielding novel TMC/graphene ensembles is of high significance, since photoinduced charge-transfer phenomena leading to intra-ensemble charge-separation, may occur...
May 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28517016/graphene-as-an-electrode-for-solution-processed-electron-transporting-organic-transistors
#6
Subir Parui, Mário Ribeiro, Ainhoa Atxabal, Roger Llopis, Fèlix Casanova, Luis E Hueso
Organic field-effect transistors (OFETs) are fundamental building blocks for plastic electronics such as organic photovoltaics or bendable displays with organic light emitting diodes, and radio-frequency identification (RFID) tags. A key part in the performance of OFET is the organic material constituting the channel. OFETs based on solution-processed polymers represent a new class of organic electronic devices. Recent developments in upscale solution-processed polymers have advanced towards high throughput, low-cost, and environmentally friendly materials for high-performance applications...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28514847/electric-field-assisted-assembly-of-colloidal-particles-into-ordered-non-close-packed-arrays
#7
Jingjing Gong, Ning Wu
Non-close packed colloidal arrays have many potential applications ranging from plasmonic sensors, light trapping for photovoltaics, to transparent electrodes. However, scalable fabrication of those structures remains a challenge. In this paper, we investigate the robustness of an electric-field assisted approach systematically. A monolayer of non-close packed crystalline array is first created under a low-frequency alternating-current electric field in solution. We then apply a sequence of direct current pulses to fix the particle array onto the substrate so that it remains intact even after both field removal and solvent evaporation...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28514169/engineering-interface-structure-to-improve-efficiency-and-stability-of-organometal-halide-perovskite-solar-cells
#8
Longbin Qiu, Luis K Ono, Yan Jiang, Matthew R Leyden, Sonia R Raga, Shenghao Wang, Yabing Qi
The rapid rise of power conversion efficiency (PCE) of low cost organometal halide perovskite solar cells suggests that these cells are a promising alternative to conventional photovoltaic technology. However, anomalous hysteresis and unsatisfactory stability hinder the industrialization of perovskite solar cells. Interface engineering is of importance for the fabrication of highly stable and hysteresis free perovskite solar cells. Here we report that a surface modification of the widely used TiO2 compact layer can give insight into interface interaction in perovskite solar cells...
May 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28514160/spatiotemporal-observation-of-electron-impact-dynamics-in-photovoltaic-materials-using-4d-electron-microscopy
#9
Basamat S Shaheen, Jingya Sun, Ding-Shyue Yang, Omar F Mohammed
Understanding light-triggered charge carrier dynamics near photovoltaic-material surfaces and at interfaces has been a key element and one of the major challenges for the development of real-world energy devices. Visualization of such dynamics information can be obtained using the one-of-a-kind methodology of scanning ultrafast electron microscopy (S-UEM). Here, we address the fundamental issue of how the thickness of the absorber layer may significantly affect the charge carrier dynamics on material surfaces...
May 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28514114/finding-relevant-parameters-for-the-thin-film-photovoltaic-cells-production-process-with-the-application-of-data-mining-methods
#10
Jan Ulaczyk, Krzysztof Morawiec, Paweł Zabierowski, Tomasz Drobiazg, Nicolas Barreau
A data mining approach is proposed as a useful tool for the control parameters analysis of the 3-stage CIGSe photovoltaic cell production process, in order to find variables that are the most relevant for cell electric parameters and efficiency. The analysed data set consists of stage duration times, heater power values as well as temperatures for the element sources and the substrate - there are 14 variables per sample in total. The most relevant variables of the process have been found based on the so-called random forest analysis with the application of the Boruta algorithm...
May 17, 2017: Molecular Informatics
https://www.readbyqxmd.com/read/28513900/unraveling-the-coulombic-forces-in-electronically-decoupled-bichromophoric-systems-during-two-successive-electron-transfers
#11
Maxim Ivanov, Shriya Wadumethrige, Denan Wang, Rajendra Rathore
Coulombic forces are vital in modulating the electron transfer dynamics in both synthetic and biological polychromophoric assemblies, yet quantitative studies of the impact of such forces are rare, as it is difficult to disentangle electrostatic forces from electronic coupling. To address this problem, herein we assess the impact of Coulombic interactions in the successive removal of two electrons from spirobifluorenes, where the electronic coupling is nonexistent. By varying the separation between a pair of fluorenes using model compounds, ion pairing, and solvation, we find that these interactions, with energies up to ~0...
May 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28513716/combining-light-harvesting-with-detachability-in-high-efficiency-thin-film-silicon-solar-cells
#12
Sanjay K Ram, Derese Desta, Rita Rizzoli, Michele Bellettato, Folmer Lyckegaard, Pia B Jensen, Bjarke R Jeppesen, Jacques Chevallier, Caterina Summonte, Arne Nylandsted Larsen, Peter Balling
Efforts to realize thin-film solar cells on unconventional substrates face several obstacles in achieving good energy-conversion efficiency and integrating light-management into the solar cell design. In this report a technique to circumvent these obstacles is presented: transferability and an efficient light-harvesting scheme are combined for thin-film silicon solar cells by the incorporation of a NaCl layer. Amorphous silicon solar cells in p-i-n configuration are fabricated on reusable glass substrates coated with an interlayer of NaCl...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28508866/tuning-colloidal-quantum-dot-band-edge-positions-through-solution-phase-surface-chemistry-modification
#13
Daniel M Kroupa, Márton Vörös, Nicholas P Brawand, Brett W McNichols, Elisa M Miller, Jing Gu, Arthur J Nozik, Alan Sellinger, Giulia Galli, Matthew C Beard
Band edge positions of semiconductors determine their functionality in many optoelectronic applications such as photovoltaics, photoelectrochemical cells and light emitting diodes. Here we show that band edge positions of lead sulfide (PbS) colloidal semiconductor nanocrystals, specifically quantum dots (QDs), can be tuned over 2.0 eV through surface chemistry modification. We achieved this remarkable control through the development of simple, robust and scalable solution-phase ligand exchange methods, which completely replace native ligands with functionalized cinnamate ligands, allowing for well-defined, highly tunable chemical systems...
May 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28508629/inorganic-ligand-thiosulfate-capped-quantum-dots-for-efficient-quantum-dot-sensitized-solar-cells
#14
Zhenwei Ren, Juan Yu, Zhenxiao Pan, Jizheng Wang, Xinhua Zhong
The insulating nature of organic ligands containing long hydrocarbon tail brings forward serious limitations for pre-synthesized quantum dots (QDs) in photovoltaic applications. Replacing the initial organic hydrocarbon chain ligands with simple, cheap, and small inorganic ligands is regarded as an efficient strategy to improve the performance of the resulting solar cells. Herein, thiosulfate (S2O32-), and sulfide (S2-) were employed as ligand exchange reagents to get access to the inorganic ligand S2O32-, and S2- capped CdSe QDs...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508587/organic-inorganic-hybrid-perovskite-with-controlled-dopant-modification-and-application-in-photovoltaic-device
#15
Wangen Zhao, Dong Yang, Shengzhong Frank Liu
Organic-inorganic hybrid perovskite as a kind of promising photovoltaic material is booming due to its low-cost, high defect tolerance, and easy fabrication, which result in the huge potential in industrial production. In the pursuit of high efficiency photovoltaic devices, high-quality absorbing layer is essential. Therefore, developing organic-inorganic hybrid perovskite thin films with good coverage, improved uniformity, and crystalline in a single pass deposition is of great concern in realizing good performance of perovskite thin-film solar cell...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28507702/plasmon-induced-charge-separation-chemistry-and-wide-applications
#16
Tetsu Tatsuma, Hiroyasu Nishi, Takuya Ishida
Recent development of nanoplasmonics has stimulated chemists to utilize plasmonic nanomaterials for efficient and distinctive photochemical applications, and physicists to boldly go inside the "wet" chemistry world. The discovery of plasmon-induced charge separation (PICS) has even accelerated these trends. On the other hand, some confusion is found in discussions about PICS. In this perspective, we focus on differences between PICS and some other phenomena such as co-catalysis effect and plasmonic nanoantenna effect...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28507663/molecular-engineering-and-sequential-cosensitization-for-preventing-the-trade-off-effect-with-photovoltaic-enhancement
#17
Weiwei Zhang, Yongzhen Wu, Xin Li, Erpeng Li, Xiongrong Song, Huiyun Jiang, Chao Shen, Hao Zhang, He Tian, Wei-Hong Zhu
In dye-sensitized solar cells (DSSCs), it is essential to use rational molecular design to obtain promising photosensitizers with well-matched energy levels and narrow optical band gaps. However, the "trade-off" effect between the photocurrent and photovoltage is still a challenge. Here we report four benzoxidazole based D-A-π-A metal-free organic dyes (WS-66, WS-67, WS-68 and WS-69) with different combinations of π-spacer units and anchoring-acceptor groups. Either extending the π-spacer or enhancing the electron acceptor can efficiently modulate the molecular energy levels, leading to a red-shift in the absorption spectra...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28506678/adaptive-super-twisting-sliding-mode-control-for-a-three-phase-single-stage-grid-connected-differential-boost-inverter-based-photovoltaic-system
#18
Akshaya K Pati, N C Sahoo
This paper presents an adaptive super-twisting sliding mode control (STC) along with double-loop control for voltage tracking performance of three-phase differential boost inverter and DC-link capacitor voltage regulation in grid-connected PV system. The effectiveness of the proposed control strategies are demonstrated under realistic scenarios such as variations in solar insolation, load power demand, grid voltage, and transition from grid-connected to standalone mode etc. Additional supplementary power quality control functions such as harmonic compensation, and reactive power management are also investigated with the proposed control strategy...
May 12, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28505415/surface-guided-core-shell-znse-znte-nanowires-as-radial-p-n-heterojunctions-with-photovoltaic-behavior
#19
Eitan Oksenberg, Sara Martí-Sànchez, Ronit Popovitz-Biro, Jordi Arbiol, Ernesto Joselevich
The organization of nanowires on surfaces remains a major obstacle toward their large-scale integration into functional devices. Surface-material interactions have been used, with different materials and substrates, to guide horizontal nanowires during their growth into well-organized assemblies, but the only guided nanowire heterostructures reported so far are axial and not radial. Here we demonstrate the guided growth of horizontal core-shell nanowires, specifically of ZnSe@ZnTe, with control over their crystal phase and crystallographic orientations...
May 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28505078/intra-minute-cloud-passing-forecasting-based-on-a-low-cost-iot-sensor-a-solution-for-smoothing-the-output-power-of-pv-power-plants
#20
Primož Sukič, Gorazd Štumberger
Clouds moving at a high speed in front of the Sun can cause step changes in the output power of photovoltaic (PV) power plants, which can lead to voltage fluctuations and stability problems in the connected electricity networks. These effects can be reduced effectively by proper short-term cloud passing forecasting and suitable PV power plant output power control. This paper proposes a low-cost Internet of Things (IoT)-based solution for intra-minute cloud passing forecasting. The hardware consists of a Raspberry PI Model B 3 with a WiFi connection and an OmniVision OV5647 sensor with a mounted wide-angle lens, a circular polarizing (CPL) filter and a natural density (ND) filter...
May 13, 2017: Sensors
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