检索结果-南通市图书馆

维普期刊数据库

Additive-free non-fullerene organic solar cells with random copolymers as donors over 9% power conversion efficiency

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第6期30卷 1161-1167页

作者： Meimei Wu Laitao Shi Yu Hu Lie Chen Ting Hu Youdi Zhang Zhongyi Yuan Yiwang Chen College of Chemistry Nanchang University Nanchang 330031 China Institute of Polymers and Energy Chemistry (IPEC) Nanchang University Nanchang 330031 China

In this study, a series of random conjugated polymers (PBDB-TBTn) as donors were designed and synthesized. In these polymers, benzodithiophene unit with thiophene conjugated side chains (BDT) are donor part, and two different content of benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) and difluorobenzothiadizole (BT) linked alkylthiophene are acceptor unit. Polymer solar cells (PSCs) were fabricated with ITIC as an acceptor, and over the power conversion efficiency (PCE) of 9%was obtained, with open circuit voltage (Voc) of 0.86 V, short-circuit current density (Jsc) of 16.84 mA/cm^2, and fill factor (FF) of 62.5%. These random conjugated polymers based solar cells are insensitive to solvent additives and thermal annealing. The performance of the device decreases gradually with the increasing of the proportion of fluorinated acceptor unit. The declining efficiency is due to the excessive fluorinated acceptor unit, which leads to over aggregated topography, destroys the effective charge transport pathways, and affects phase separation domain size between the donor and the acceptor. The phenomena are explained by the charge carrier recombination, atomic force microscope (AFM), and transmission electron microscope (TEM). These results indicate that proper addition of fluorinated acceptor units to build random copolymers can enhance the efficiency of organic photovoltaics toward additive-free and thermal annealing-free PSCs.

关键词： Random conjugated polymer Polymer solar cells Ternary conjugate polymers Non-fullerene organic photovoltaics

维普期刊数据库

One-pot hydrothermal synthesis and fabrication of kesterite Cu2ZnSn（S,Se）4 thin films

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第5期27卷 550-555页

作者： Zhengqi Shi Ahalapitiya H.Jayatissa Nanotechnology and MEMS Laboratory Department of MechanicalIndustrialand Manufacturing EngineeringThe University of Toledo

Kesterite Cu2Zn Sn（S,Se）4（CZTSSe）powder was synthesized by a hydrothermal *** thin films were fabricated by physical vapor deposition of CZTSSe powder followed by a thermal annealing *** kesterite microstructure was identified by the X-ray diffraction and Raman *** morphology and elemental composition of CZTSSe thin films were also *** dependence of resistance on the temperature of CZTSSe film was measured and the thermal activation energy of conductivity was estimated to be 0.33 eV based on Arrhenius plot of resistance versus temperature.A high absorption coefficient(>10～4cm-1)of CZTSSe was found in the visible and NIR regions of the spectrum.A direct band gap structure with band gap energy of 1.46 eV was also estimated for CZTSSe *** photoconductivity was measured under both AM 1.5G and NIR illumination and a stable and fully recoverable photoconductivity was observed for both asdeposited and annealed CZTSSe *** annealed films show a higher photoconductivity than the as-deposited films under both AM 1.5G and NIR lights.

关键词： CZTSSe Hydrothermal Physical vapor deposition Coating Nanocrystals photovoltaics

Carbon Materials in Perovskite Solar Cells: Prospects and Future Challenges

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

能源与环境材料（英文） 2019年第2期2卷 107-118页

作者： Victoria Ferguson S.Ravi P.Silva Wei Zhang Advanced Technology Institute(ATI) University of SurreyGU27XHUK

Metal halide perovskite solar cells are emerging candidates for nextgeneration thin-film photovoltaic devices with the potential for extremely low fabrication cost and high power conversion *** solar cells have demonstrated a rapid development in device performance over the last decade,from an initial 3.81%to a most recently certified 24.2%,though the challenges of long-term stability and lead toxicity still *** materials,ranging from zero-dimensional carbon quantum dots to threedimensional carbon black materials,are promising candidates for the enhancement of both efficiency and stability of perovskite solar cells,offering unique advantages for incorporation into various device *** this review article,we present a concise overview of important and exciting advancements of perovskite solar cells that incorporate different dimensions of carbon material in their device architectures in an effort to simultaneously improve device performance and long-term *** also discuss the major advantages and potential challenges of each technique that has been developed in the most recent ***,we outline the future opportunities toward more efficient and stable perovskite solar cells utilizing carbon materials.

关键词： carbon materials long-term stability metal halide perovskite photovoltaics

维普期刊数据库

A Study on the Efficiency Gain of CsSnGeI₃ Solar Cells with Graphene Doping

在线全文

学校读者我要写书评

暂无评论

World Journal of Condensed Matter Physics 2023年第3期13卷 90-104页

作者： Mohammed M. Shabat Guillaume Zoppi Department of Physics The Islamic University of Gaza Gaza Strip Palestine Department of Mathematics Physics & Electrical Engineering Northumbria University Newcastle upon Tyne UK

This paper presents a newly designed ultra-thin, lead-free, and all-inorganic solar cell structure. The structure was optimized using the SCAPS-1D simulator, incorporating solid-state layers arranged as n-graphene/CsSnGeI3/p-graphene. The objective was to investigate the potential of utilizing n-graphene as the electron transport layer and p-graphene as the hole transport layer to achieve maximum power conversion efficiency. Various materials for the electron transport layer were evaluated. The optimized cell structure achieved a maximum power conversion efficiency of 20.97%. The proposed solar cell structure demonstrates promising potential as an efficient, inorganic photovoltaic device. These findings provide important insights for developing and optimizing inorganic photovoltaic cells based on CsSnGeI3, with n-graphene electron transport layers and p-graphene hole transport layers.

关键词： Perovskite Solar Cells Efficiency Gain CsSnGeI3 Solar Cells Graphene Doping photovoltaics Thin-Film Solar Cells Energy Conversion

Review: Advances in the CIGS Thin Films for Photovoltaic Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Smart Grid and Renewable Energy 2022年第4期13卷 75-87页

作者： Phyllis Makena Mwenda Walter Njoroge Sarroney Mirenga Dickson Mwenda Kinyua Department of Physics Kenyatta University Nairobi Kenya Department of Physical Sciences Meru University of Science and Technology Meru Kenya Department of Pure and Applied Sciences Kirinyaga University Kerugoya Kenya

The copper indium gallium selenium (CIGS) thin film is widely acknowledged as the most promising material for photovoltaic applications. Mainly due to appealing chemical and physical structures properties, low fabrication cost, high efficiency, and uncomplicated integration especially with the advancement in the use of the flexible substrate. Promising results have been achieved in CIGS-based solar cells in the last few years and these devices could be key in unlocking the potential of green energy. Therefore, it is necessary to understand the parameters that are critical to improving the efficiency of these devices. Parameters such as doping concentration, thickness, substrates, and energy bandgap. In this review, we comprehensively report on these parameters with an aim of showing the recent progress on the various methods used to optimize them, all geared towards efficient and low cost solar cells for PV applications.

关键词： CIGS Thin Films photovoltaics Efficiency

Highly efficient GaAs solar cells by limiting light emission angle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2013年第1期2卷 236-241页

作者： Emily D Kosten Jackson H Atwater James Parsons Albert Polman Harry A Atwater Thomas J.Watson Laboratories of Applied Physics California Institute of TechnologyPasadenaCA 91125 USA Center for Nanophotonics FOM-Institute AMOLFScience Park 1041098XG AmsterdamThe Netherlands

In a conventional flat plate solar cell under direct sunlight,light is received from the solar disk,but is re-emitted *** isotropic emission corresponds to a significant entropy increase in the solar cell,with a corresponding drop in ***,using a detailed balance model,we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38%with a single *** highest efficiencies are predicted for a thin,light trapping cell with an ideal back reflector,though the scheme is robust to a non-ideal back *** with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells,but also for significantly higher overall efficiencies with an excellent rear ***,we present ray-tracing and detailed balance analysis of two angular coupler designs,show that significant efficiency improvements are possible with these couplers,and demonstrate initial fabrication of one coupler design.

关键词： detailed balance GaAs solar cell light trapping photovoltaics two photon lithography

Light concentration using hetero-junctions of anisotropic low permittivity metamaterials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2013年第1期2卷 18-26页

作者： Mohammad Memarian George V Eleftheriades The Edward S.Rogers Sr.Department of Electrical and Computer Engineering University of TorontoTorontoOnt.M5S 2E4Canada

Focusing incident power into an area of high concentration is of significant interest for various *** optics,this has been traditionally achieved with lenses where a higher curvature and lens permittivity typically result in shorter focal distances(low f/D).In this work,we present designs and techniques for collecting,refracting and guiding incident light into an area of high power concentration(a hot spot)at extremely short ***,a flat low-profile focusing mechanism is presented using a hetero-junction of anisotropic metamaterials(MTMs).The hetero-junction is formed from two cleaved finite slabs of low(near zero)permittivity anisotropic MTMs with rotated optical *** MTMs have near zero longitudinal permittivity while matched in the transverse *** MTMs are shown to provide a unique ability to bend the transverse magnetic or p-polarized light away from the normal and along the interface,contrary to conventional dielectrics,and with minimal reflections;hence allowing for a low profile *** in the optical regime are presented using periodic bilayers of metal and *** proposed hetero-junction focusing device concentrates the normally incident plane wave and/or beam into a corresponding focal region similar to a lens via multiple *** hetero-junction is capable of creating a hot spot very close to the device,much closer than dielectric lenses and it significantly outperforms the size requirements of thick high curvature lenses with low f/D *** proposed designs can find applications in various scenarios including solar and thermo photovoltaics,photodetectors,concentrated photovoltaics,non-imaging optics,micro-and nano-Fresnel lenses.

关键词： epsilon near zero focusing light concentration metamaterials non-imaging optics photovoltaics

Estimating the impact of azimuth-angle variations on photovoltaic annual energy production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clean Energy 2019年第1期3卷 47-58页

作者： Mahmoud Dhimish Santiago Silvestre Laboratory of photovoltaics University of HuddersfieldQueensgateHD13DHHuddersfieldUK MNT Group Electronic Engineering DepartmentUniversitat Politecnica de Catalunya(UPC)BarcelonaTechC/Jordi Girona 1-3Campus Nord UPC08034 BarcelonaSpain

The performance of a photovoltaic(PV)installation is affected by its tilt and azimuth angles,because these parameters change the amount of solar energy absorbed by the surface of the PV ***,this paper demonstrates the impact of the azimuth angle on the energy production of PV *** different PV sites were studied,where the first comprises PV systems installed at-13°,-4°,+12°and+21°azimuth angles in different geographical locations,whereas the second PV site included adjacent PV systems installed at-87°,-32°,+2°and+17°azimuth *** the investigated PV sites were located in Huddersfield,*** summary,the results indicate that PV systems installed between-4°and+2°presented the maximum energy production over the last 4 years,while the worst energy generation were observed for the PV system installed at an azimuth angle of-87°.Finally,the probability projections for all observed azimuth angles datasets have been *** PV systems are affected by various environmental conditions such as fluctuations in the wind,humidity,solar irradiance and ambient temperature,ultimately,these factors would affect the annual energy generation of the PV *** that reason,we have analysed the disparities and the probability of the annual energy production for multiple PV systems installed at different azimuth angles ranging from-90°to+90°degrees,and affected by different environmental *** analyses are based on the cumulative density function modelling technique as well as the normal distribution function.

关键词： photovoltaics azimuth angle energy production CDF modelling

Improving metal reflectors by suppressing surface plasmon polaritons: a priori calculation of the internal reflectance of a solar cell

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2013年第1期2卷 32-37页

作者： Zachary C Holman Stefaan De Wolf Christophe Ballif Swiss Federal Institute of Technology Lausanne(EPFL)Institute of Microengineering(IMT)Photovoltaics and Thin-Film Electronics LaboratoryCH-2000 NeuchaˆtelSwitzerland

Imperfect internal reflectance of near-bandgap light reduces the performance of all solar cells,and becomes increasingly detrimental as absorbers become *** consider light incident on the silicon/dielectric/metal structure at the back of rear-passivated crystalline silicon solar cells with surface textures that are large enough for geometric *** calculating the absorbance in the metal as a function of the angle of incidence,we discover three results that are important for understanding and improving rear reflectors in many types of solar ***,significant parasitic absorption occurs in the metal layer in two cases:s-and p-polarized propagating modes(near-normal angles of incidence)when the dielectric thickness is adjusted to cause destructive interference of the reflected beams,and p-polarized evanescent modes(angles of incidence above the semiconductor/dielectric critical angle)that excite surface plasmon polaritons at the metal ***,the latter loss dominates;a well-designed rear dielectric passivation layer must suppress the penetration of evanescent waves to the ***,when used as an input in a simple analytical model,the average rear internal reflectance calculated by assuming a Lambertian angular distribution of light accurately predicts the total reflectance and absorbance of a solar cell.

关键词： light trapping photovoltaics plasmon silicon solar cell