共查询到20条相似文献,搜索用时 9 毫秒
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Triple‐Layer Structured Composite Separator Membranes with Dual Pore Structures and Improved Interfacial Contact for Sustainable Dye‐Sensitized Solar Cells 下载免费PDF全文
Soo Bong Hong So Hyun Park Jeong‐Hoon Kim Sang‐Young Lee Young Soo Kwon Taiho Park Phil‐Hyun Kang Sung Chul Hong 《Liver Transplantation》2014,4(13)
A composite separator membrane (CSM) with an A/B/A type layered structure, composed of a microporous electrolyte‐philic poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVdF‐HFP) gel layer (A) and a submicrometer porous polyethylene (PE) or a macroporous poly(ethylene terephthalate) (PET) non‐woven matrix (B), is introduced in a dye‐sensitized solar cell (DSSC). Commercially available PE and PET separator membranes (SMs) act as matrices that provide mechanical stability to the DSSC and permanent pore structures for facilitated ion transport. PVdF‐HFP is used as a microporous gelator for improved interfacial contact between the solid SM and the electrodes. The PVdF‐HFP gel impedes the charge recombination process between electron and I3 ? at the TiO2/electrolyte interface, resulting in improved electron lifetimes. The DSSC assembled with the CSM exhibits high initial solar energy conversion efficiency (η, 6.1%) and stable η values over 1400 h, demonstrating good long term stability. The behaviors of the DSSC are attributed to the synergistic factors of the CSM, such as improved ion conductivity, electrolyte affinity, electrolyte retention capability, effective interfacial contact, and plausible passivation of the dyes. This study demonstrates a practical combination of short‐ and long‐term DSSC performance through the introduction of the CSM. 相似文献
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Christopher B. Cooper Edward J. Beard lvaro Vzquez‐Mayagoitia Liliana Stan Gavin B. G. Stenning Daniel W. Nye Julian A. Vigil Tina Tomar Jingwen Jia Govardhana B. Bodedla Song Chen Lucía Gallego Santiago Franco Antonio Carella K. R. Justin Thomas Song Xue Xunjin Zhu Jacqueline M. Cole 《Liver Transplantation》2019,9(5)
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Bo Ding Bong Jae Lee Mengjin Yang Hyun Suk Jung Jung‐Kun Lee 《Liver Transplantation》2011,1(3):415-421
In this study, the effect of plasmonic core‐shell structures, consisting of dielectric cores and metallic nanoshells, on energy conversion in dye‐sensitized solar cells (DSSCs) is investigated. The structure of the core‐shell particles is controlled to couple with visible light so that the visible component of the solar spectrum is amplified near the core‐shell particles. In core‐shell particle – TiO2 nanoparticle films, the local field intensity and light pathways are increased due to the surface plasmons and light scattering. This, in turn, enlarges the optical cross‐section of dye sensitizers coated onto the mixed films. When 22 vol% of core‐shell particles are added to a 5 μm thick TiO2 film, the energy conversion efficiency of DSSCs increases from 2.7% to 4.0%, in spite of a more than 20% decrease in the amount of dyes adsorbed on the composite films. The correlation between core‐shell particle content and energy conversion efficiency in DSSCs is explained by the balance among near‐field effects, light scattering efficiency, and surface area in the composite films. 相似文献
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Dye‐Sensitized Solar Cells: 1,1,2,2‐Tetrachloroethane (TeCA) as a Solvent Additive for Organic Hole Transport Materials and Its Application in Highly Efficient Solid‐State Dye‐Sensitized Solar Cells (Adv. Energy Mater. 10/2015) 下载免费PDF全文
Bo Xu Erik Gabrielsson Majid Safdari Ming Cheng Yong Hua Haining Tian James M. Gardner Lars Kloo Licheng Sun 《Liver Transplantation》2015,5(10)
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Torben Daeneke Ze Yu George P. Lee Dongchuan Fu Noel W. Duffy Satoshi Makuta Yasuhiro Tachibana Leone Spiccia Amaresh Mishra Peter Bäuerle Udo Bach 《Liver Transplantation》2015,5(4)
Nickel oxide based p‐type dye‐sensitized solar cells (DSCs) are limited in their efficiencies by poor fill factors (FFs). This work explores the origins of this limitation. Transient absorption spectroscopy identifies fast recombination between the injected hole and the dye anion under applied load as one of the predominant reasons for the poor FF of NiO‐based DSCs. A reduced hole injection efficiency, ηINJ, under applied load is found to play an equally important role. Both, the dye regeneration yield, ΦREG, and ηINJ decrease by approximately 40%–50% when moving from short‐ to open‐circuit conditions. Spectroelectrochemical measurements reveal that the electrochromic properties of NiO are a further limiting factor for the device performance leading to variable light‐harvesting efficiencies, ηLH, under applied load. The peak light‐harvesting efficiency decreases from 63% at short circuit to 57% at 600 mV reducing the FF of NiO DSCs by 5%. This effect is expected to be more pronounced for future devices with higher operating voltages. Incident, photon‐to‐electron conversion efficiency front–back analysis at applied bias is utilized to characterize the interfacial charge recombination. It is found that the recombination between the injected hole and the redox mediator has a surprisingly small effect on the FF. 相似文献
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Solar Cells: Room‐Temperature Vapor Deposition of Cobalt Nitride Nanofilms for Mesoscopic and Perovskite Solar Cells (Adv. Energy Mater. 13/2018) 下载免费PDF全文
Jin Soo Kang Jae‐Yup Kim Jungjin Yoon Jin Kim Jiwoong Yang Dong Young Chung Min‐cheol Kim Hansol Jeong Yoon Jun Son Bong Gyu Kim Juwon Jeong Taeghwan Hyeon Mansoo Choi Min Jae Ko Yung‐Eun Sung 《Liver Transplantation》2018,8(13)
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Next‐generation organic solar cells such as dye‐sensitized solar cells (DSSCs) and perovskite solar cells (PSCs) are studied at the National Institute of Advanced Industrial Science and Technology (AIST), and their materials, electronic properties, and fabrication processes are investigated. To enhance the performance of DSSCs, the basic structure of an electron donor, π‐electron linker, and electron acceptor, i.e., D–π–A, is suggested. In addition, special organic dyes containing coumarin, carbazole, and triphenylamine electron donor groups are synthesized to find an effective dye structure that avoids charge recombination at electrode surfaces. Meanwhile, PSCs are manufactured using both a coating method and a laser deposition technique. The results of interfacial studies demonstrate that the level of the conduction band edge (CBE) of a compact TiO2 layer is shifted after TiCl4 treatment, which strongly affects the solar cell performance. Furthermore, a special laser deposition system is developed for the fabrication of the perovskite layers of PSCs, which facilitates the control over the deposition rate of methyl ammonium iodide used as their precursor. 相似文献
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High‐Performance,Transparent, Dye‐Sensitized Solar Cells for See‐Through Photovoltaic Windows 下载免费PDF全文
Kun Zhang Chuanjiang Qin Xudong Yang Ashraful Islam Shufang Zhang Han Chen Liyuan Han 《Liver Transplantation》2014,4(11)
Dye‐sensitized solar cells (DSCs) have attracted great interest as one of the most promising photovoltaic technologies, and transparent DSCs show potential applications as photovoltaic windows. However, the competition between light absorption for photocurrent generation and light transmittance for obtaining high transparency limits the performance of transparent DSCs. Here, transparent DSCs exhibiting a high light transmittance of 60.3% and high energy conversion efficiency (3.66%) are reported. The strategy is to create a cocktail system composed of ultraviolet and near‐infrared dye sensitizers that selectively and efficiently harvest light in the invisible or low‐eye‐sensitivity region while transmitting light in high‐eye‐sensitivity regions. This new design provides a reasonable approach for realizing high efficiency and transparency DSCs that have potential applications as photovoltaic windows. 相似文献
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Andreas Kunzmann Silvia Valero Ángel E. Sepúlveda Marisa Rico‐Santacruz Elena Lalinde Jesús R. Berenguer Javier García‐Martínez Dirk M. Guldi Elena Serrano Rubén D. Costa 《Liver Transplantation》2018,8(12)
In this work, a new strategy to design low‐temperature (≤200 °C) sintered dye‐sensitized solar cells (lt‐DSSC) is reported to enhance charge collection efficiencies (ηcoll), photoconversion efficiencies (η), and stabilities under continuous operation conditions. Realization of lt‐DSSC is enabled by the integration of hybrid nanoparticles based on TiO2‐Ru(II) complex (TiO2_Ru_IS)—obtained by in situ bottom‐up construction of Ru(II) N3 dye‐sensitized titania—into the photoelectrode. Incentives for the use of TiO2_Ru_IS are i) dye stability due to its integration into the TiO2 anatase network and ii) enhanced charge collection yield due to its significant resistance toward electron recombination with electrolytes. It is demonstrated that devices with single‐layer photoelectrodes featuring blends of P25 and TiO2_Ru_IS give rise to a 60% ηcoll relative to a 46% ηcoll for devices with P25‐based photoelectrodes. Responsible for this trend is a better charge transport and a reduced electron recombination. When using a multilayered photoelectrode architecture with a top layer based only on TiO2_Ru_IS, devices with an even higher ηcoll (74%) featuring a η of around 8.75% and stabilities of 600 h are achieved. This represents the highest values reported for lt‐DSSC to date. 相似文献
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Electrodes: A New Graphdiyne Nanosheet/Pt Nanoparticle‐Based Counter Electrode Material with Enhanced Catalytic Activity for Dye‐Sensitized Solar Cells (Adv. Energy Mater. 12/2015) 下载免费PDF全文
Hao Ren Hui Shao Lijuan Zhang Dong Guo Quan Jin Ranbo Yu Lei Wang Yuliang Li Yun Wang Huijun Zhao Dan Wang 《Liver Transplantation》2015,5(12)
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Recently, there is an urgent need for alternative energy resources due to the nonrenewable nature of fossil fuels and increasing CO2 greenhouse gas emissions. The photovoltaic technologies which directly utilize the abundant and sustainable solar energy are critical. Among various photovoltaic devices (solar cells), dye‐sensitized solar cells (DSSCs) have gained increasing attention due to their high efficiency and easy fabrication process in the past decade. The cathode is a critical part in DSSCs while the benchmark Pt cathode suffers from high cost and scarcity. Thus, the development of alternative Pt‐free cathodes has attracted significant attention with the aim to heighten the cost competitiveness of DSSCs. Among various cathodes, metal oxides are of growing interest due to their superior activity, robust stability, and low cost. Simple oxides such as WO3 and SnO2 are used as cathodes for DSSCs. Considering the fixed atomic environment in simple oxides, complex oxides are more attractive as cathodes because of their more flexible physical and chemical properties. This review attempts to present the rational design of simple/complex metal oxide–based cathodes in DSSCs and then to provide useful guidance for the future design of Pt‐free cathodes. The demonstrated design strategies can be extended to other electrocatalysis‐based applications. 相似文献