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solar energy

Yinan Zhang, Yi Xu, Shiren Chen, Hua Lu, Kai Chen, Yaoyu Cao, Andrey E Miroshnichenko, Min Gu, Xiangping Li
Emerging high-index all-dielectric nanostructures, capable of manipulating light at the subwavelength scale, empower designing and implementing novel antireflection and light trapping layers in many photonic and optoelectronic devices. However, their performance and practicality are compromised by relatively narrow bandwidths and highly sophisticated fabrications. In this paper, we demonstrate an ultra-broadband (300-1200 nm) directional light scattering strategy using high-index surface silicon oligomer resonators fabricated by a facile, scalable and low-cost colloidal lithography technique...
April 23, 2018: ACS Applied Materials & Interfaces
Geert Pirotte, Jurgen Kesters, Tom Cardeynaels, Pieter Verstappen, Jan D'Haen, Laurence Lutsen, Benoît Champagne, Dirk Vanderzande, Wouter Maes
Push-pull-type conjugated polymers applied in organic electronics do not always contain a perfect alternation of donor and acceptor building blocks. Misscouplings can occur, which have a noticeable effect on the device performance. In this work, the influence of homocoupling on the optoelectronic properties and photovoltaic performance of PDTSQxff polymers is investigated, with a specific focus on the quinoxaline acceptor moieties. A homocoupled biquinoxaline segment is intentionally inserted in specific ratios during the polymerization...
April 22, 2018: Macromolecular Rapid Communications
Linfan Cui, Panpan Zhang, Yukun Xiao, Yuan Liang, Hanxue Liang, Zhihua Cheng, Liangti Qu
The use of abundant solar energy for regeneration and desalination of water is a promising strategy to address the challenge of a global shortage of clean water. Progress has been made to develop photothermal materials to improve the solar steam generation performance. However, the mass production rate of water is still low. Herein, by a rational combination of photo-electro-thermal effect on an all-graphene hybrid architecture, solar energy can not only be absorbed fully and transferred into heat, but also converted into electric power to further heat up the graphene skeleton frame for a much enhanced generation of water vapor...
April 23, 2018: Advanced Materials
Liqiang Huang, Gang Wang, Weihua Zhou, Boyi Fu, Xiaofang Cheng, Lifu Zhang, Zhibo Yuan, Sixing Xiong, Lin Zhang, Yuanpeng Xie, Andong Zhang, Youdi Zhang, Wei Ma, Weiwei Li, Yinhua Zhou, Elsa Reichmanis, Yiwang Chen
High efficiency organic solar cells (OSCs) can be produced through optimization of component molecular design, coupled with interfacial engineering and control of active layer morphology. However, vertical stratification of the bulk-heterojunction (BHJ), a spontaneous activity which occurs during the drying process, remains an intricate problem yet to be solved. Routes toward regulating the vertical separation profile and evaluating the effects on the final device should be explored to further enhance the performance of OSCs...
April 20, 2018: ACS Nano
Geon Hyeong Lee, Young Sik Kim
A novel quinoxaline-based organic dye with heteroleptic dual electron donors (phenoxazine and carbazole) on each side of a quinoxaline was designed, and its electronic and optical properties were investigated theoretically for applications to dye-sensitized solar cells (DSSCs). To understand the factors influencing the photovoltaic efficiency, density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations of these dyes were performed. The absorption spectrum of the dyes showed different forms because of the different energy levels of the molecular orbital (MO) of each dye and the intramolecular charge-transfer (ICT) characteristics...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Geon Hyeong Lee, Young Sik Kim
In this study, phenoxazine (PXZ)-based dye sensitizers with triphenylamine (TPA) as a dual-electron donor and thiophen and benzothiadiazole (BTD) or 4,7-diethynylbenzo[c][1,2,5]thiadiazole (DEBT) as an electron acceptor (dye1, dye2, and dye3) were designed and investigated. dye3 can significantly stabilize the lowest unoccupied molecular orbital (LUMO) energy level of an organic dye. We used density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to better understand the factors responsible for the photovoltaic performance...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Taewoo Eom, Jeong Eun Park, Sang Yong Park, Jeong Hoon Park, Jackson Bweupe, Donggun Lim
Copper indium gallium selenide (CIGS) thin film solar cells have been regarded as a candidate for energy conversion devices owing to their high absorption coefficient, high temperature stability, and low cost. ZnO:Al thin film is commonly used in CIGS solar cells as a window layer. In this study, ZnO:Al films were deposited on glass under various post-heat temperature using RF sputtering to observe the characteristics of ZnO:Al films such as Hall mobility, carrier concentration, and resistivity; subsequently, the ZnO:Al films were applied to a CIGS solar cell as a window...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Pierre Josse, Sergey Dayneko, Yangqian Zhang, Sylvie Dabos-Seignon, Shiming Zhang, Philippe Blanchard, Gregory C Welch, Clément Cabanetos
The synthesis and preliminary evaluation as donor material for organic photovoltaics of the poly(diketopyrrolopyrrole-spirobifluorene) ( PDPPSBF ) is reported herein. Prepared via homogeneous and heterogeneous direct (hetero)arylation polymerization (DHAP), through the use of different catalytic systems, conjugated polymers with comparable molecular weights were obtained. The polymers exhibited strong optical absorption out to 700 nm as thin-films and had appropriate electronic energy levels for use as a donor with PC70 BM ...
April 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Penghui Gao, Meng Zhang, Yuji Du, Bo Cheng, Donghai Zhang
Water is important resource for human survival and development. Coal mine wastewater (CMW) is a byproduct of the process of coal mining, which is about 7.0 × 1010 m3 in China in 2016. Considering coal mine wastewater includes different ingredients, a new bubble column humidification and dehumidification system is proposed for CMW treatment. The system is mainly composed of a bubble column humidification and dehumidification unit, solar collector, fan and water tank, in which air is used as a circulating medium...
April 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yiou Wang, Hajime Suzuki, Jijia Xie, Osamu Tomita, David James Martin, Masanobu Higashi, Dan Kong, Ryu Abe, Junwang Tang
Visible light-driven water splitting using cheap and robust photocatalysts is one of the most exciting ways to produce clean and renewable energy for future generations. Cutting edge research within the field focuses on so-called "Z-scheme" systems, which are inspired by the photosystem II-photosystem I (PSII/PSI) coupling from natural photosynthesis. A Z-scheme system comprises two photocatalysts and generates two sets of charge carriers, splitting water into its constituent parts, hydrogen and oxygen, at separate locations...
April 20, 2018: Chemical Reviews
Lei Lei, Shude Zhang, Songwang Yang, Xiaomin Li, Yu Yu, Qingzhu Wei, Zhichun Ni, Ming Li
Interfaces have a significant impact on the performance of perovskite solar cells. This work investigated the influence of hole transport material/metal contact interface on photovoltaic behaviours of perovskite solar devices. Different hole material/metal contact interfaces were obtained by depositing the metal under different conditions. High incident kinetic energy metal particles were proved to penetrate and embed into the hole transport material. These isolated metal particles in hole transport materials capture holes and increase the apparent carrier transport resistance of the hole transport layer...
April 20, 2018: Nanotechnology
Vellimalai Punitharasu, Munavvar Fairoos Mele Kavungathodi, Jayaraj Nithyanandhan
To synergize both steric and electronic factors in designing the dyes for dye-sensitized solar cells (DSSCs), a series of cis-configured unsymmetrical squaraine dyes P11-15 with suitably functionalized alkyl groups and electron withdrawing group containing squaric acid unit were synthesized, respectively. These dyes capture the importance of (i) the effect and position of branched alkyl groups, (ii) mono- and di-anchoring groups containing dyes and (iii) further appending alkyl groups through the cyanoester vinyl unit on the central squaric acid units of D-A-D based cis-configured squaraine dyes...
April 20, 2018: ACS Applied Materials & Interfaces
Fang-Shuai Zhang, Jia-Wei Wang, Jun Luo, Rui-Rui Liu, Zhi-Ming Zhang, Chun-Ting He, Tong-Bu Lu
The development of highly efficient, low-cost and stable electrocatalysts for overall water splitting is highly desirable for the storage of intermittent solar energy and wind energy sources. Herein, we show for the first time that nickel can be extracted from NiFe-layered double hydroxide (NiFe-LDH) to generate an Ni2 P@FePO x heterostructure. The Ni2 P@FePO x heterostructure was converted to an Ni2 P@NiFe hydroxide heterostructure (P-NiFe) during water splitting, which displays high electrocatalytic performance for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1...
February 7, 2018: Chemical Science
Ming-Min Yang, Dong Jik Kim, Marin Alexe
It is highly desirable to discover photovoltaic mechanisms that enable a higher efficiency of solar cells. Here, we report that the bulk photovoltaic effect, which is free from the thermodynamic Shockley-Queisser limit but usually manifested only in noncentrosymmetric (piezoelectric or ferroelectric) materials, can be realized in any semiconductor, including silicon, by mediation of flexoelectric effect. We introduce strain gradients using either an atomic force microscope or a micron-scale indentation system, creating giant photovoltaic currents from centrosymmetric single crystals of SrTiO3 , TiO2 , and Si...
April 19, 2018: Science
Long Li, Qinggong Wang
Ionic fluids are essential to energy conversion, water desalination, drug delivery, and lab-on-a-chip devices. Ionic transport in nanoscale confinements and complex physical fields still remain elusive. Here, a nanofluidic system is developed using nanochannels of heterogeneous surface properties to investigate transport properties of ions under different temperatures. Steady ionic currents are observed under symmetric temperature gradients, which is equivalent to generating electricity using waste heat (e...
April 19, 2018: Small
Changjian Song, Xiaohui Liu, Xiaodong Li, Ying-Chiao Wang, Li Wan, Xiaohua Sun, Wenjun Zhang, Junfeng Fang
Nonfullerene polymer solar cells (PSCs) have earned widespread and intense interest on account of their properties such as tunable energy levels, potential for low-cost production processes, reduced energy losses, and strong light absorption coefficients. Here, a water-/alcohol-soluble zwitterion perylene diimide zwitterion (PDI-z) consisted of sulfobetaine ion as a terminal substituent and PDI as a conjugated core was synthesized. PDI-z was employed as an electron-transport layer (ETL) for nonfullerene PSC devices, obtaining an optimal power conversion efficiency (PCE) above 11...
April 19, 2018: ACS Applied Materials & Interfaces
Qing-Lu Liu, Zong-Yan Zhao, Jian-Hong Yi
For photocatalytic applications, the response of a material to the solar spectrum and its redox capabilities are two important factors determined by the band gap and band edge position of the electronic structure of the material. The crystal structure and composition of the photocatalyst are fundamental for determining the above factors. In this article, we examine the functional material Ta-O-N as an example of how to discuss relationships among these factors in detail with the use of theoretical calculations...
April 19, 2018: Physical Chemistry Chemical Physics: PCCP
Santosh K Suram, Lan Zhou, Aniketa Shinde, Qimin Yan, Jie Yu, Mitsutaro Umehara, Helge S Stein, Jeffrey B Neaton, John M Gregoire
Combinatorial (photo)electrochemical studies of the (Ni-Mn)Ox system reveal a range of promising materials for oxygen evolution photoanodes. X-ray diffraction, quantum efficiency, and optical spectroscopy mapping reveal stable photoactivity of NiMnO3 in alkaline conditions with photocurrent onset commensurate with its 1.9 eV direct band gap. The photoactivity increases upon mixture with 10-60% Ni6MnO8 providing an example of enhanced charge separation via heterojunction formation in mixed-phase thin film photoelectrodes...
April 19, 2018: Chemical Communications: Chem Comm
Yanfei Xu, Xiaoxue Wang, Jiawei Zhou, Bai Song, Zhang Jiang, Elizabeth M Y Lee, Samuel Huberman, Karen K Gleason, Gang Chen
Traditional polymers are both electrically and thermally insulating. The development of electrically conductive polymers has led to novel applications such as flexible displays, solar cells, and wearable biosensors. As in the case of electrically conductive polymers, the development of polymers with high thermal conductivity would open up a range of applications in next-generation electronic, optoelectronic, and energy devices. Current research has so far been limited to engineering polymers either by strong intramolecular interactions, which enable efficient phonon transport along the polymer chains, or by strong intermolecular interactions, which enable efficient phonon transport between the polymer chains...
March 2018: Science Advances
Zhi-Hao Cui, Yuechao Wang, Min-Ye Zhang, Xi Xu, Hong Jiang
First-principles prediction of electronic band structures of materials is crucial for rational material design, especially in solar-energy related materials science. Hybrid functionals that mix the Hartree-Fock exact exchange with local or semi-local density functional approximations have proven to be accurate and efficient alternatives to more sophisticated Green's function-based many-body perturbation theory. The optimal fraction of the exact exchange, previously often treated as an empirical parameter, is closely related to the screening strength of the system under study...
April 19, 2018: Journal of Physical Chemistry Letters
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