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Improving the operational stability of perovskite solar cells with cesium-doped graphene oxide interlayer

Journal of Energy Chemistry 2024年第9期96卷 483-490页

作者： masaud Almalki Katerina Anagnostou Konstantinos Rogdakis Felix T.Eickemeyer mostafa Othman minas m.Stylianakis Dimitris Tsikritzis Anwar Q.Alanazi Nikolaos Tzoganakis Lukas Pfeifer Rita Therisod Xiaoliang mo Christian m.Wolff Aïcha Hessler-Wyser shaik m.zakeeruddin Hong Zhang Emmanuel Kymakis michael Grätzel Laboratory of Photonics and Interfaces École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Department of Electrical and Computer Engineering Hellenic Mediterranean UniversityHeraklionCrete 71410Greece Institute of Electrical and microengineering(IEm)Photovoltaics and Thin-Film Electronics Laboratory(PV-Lab) École Polytechnique Fédérale de Lausanne(EPFL)Neuchâtel 2000Switzerland Department of Nursing Faculty of Health SciencesHellenic Mediterranean UniversityCrete 71410Greece Centre Interdisciplinaire de microscopie Electronique École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Future Energy Technology Institute King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Saudi Arabia State Key Laboratory of Photovoltaic Science and Technology Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionInstitute of OptoelectronicsDepartment of Materials ScienceFudan UniversityShanghai 200433China

Perovskite solar cells(PSCs)have made great advances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hinder their *** interface between the perovskite layer and the charge-carrier transporting layers plays a crucial role in undermining the stability of *** this work,we propose a strategy to stabilize high-performance PSCs with PCE over 23%by introducing a cesium-doped graphene oxide(GO-Cs)as an interlayer between the perovskite and hole-transporting *** GO-Cs treated PSCs exhibit excellent operational stability with a projected T80(the time where the device PCE reduces to 80%of its initial value)of 2143 h of operation at the maximum powering point under one sun illumination.

关键词： Perovskite solar cells Doped graphene oxide Graphene related material Long-term operational stability

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Perovskite Solar Cells Yielding Reproducible Photovoltage of 1.20 V

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Research 2019年第1期2019卷 1106-1114页

作者： Essa A.Alharbi m.Ibrahim Dar Neha Arora mohammad Hayal Alotaibi Yahya A.Alzhrani Pankaj Yadav Wolfgang Tress Ahmed Alyamani Abdulrahman Albadri shaik m.zakeeruddin michael Grätzel Laboratory of Photonics and Interfaces Institute of Chemical Sciences and EngineeringEcole Polytechnique Federale de LausanneLausanne CH-1015Switzerland National Nanotechnology Research Centre King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Saudi Arabia National Center for Petrochemicals Technology King Abdulaziz City for Science and Technology(KACST)P.O.Box 608611442 RiyadhSaudi Arabia

High photovoltages and power conversion efciencies of perovskite solar cells(PSCs)can be realized by controlling the undesired nonradiative charge carrier ***,we introduce a judicious amount of guanidinium iodide into mixed-cation and mixed-halide perovskite flms to suppress the parasitic charge carrier recombination,which enabled the fabrication of>20%efcient and operationally stable PSCs yielding reproducible photovoltageas high as 1.20 *** introducing guanidinium iodide into the perovskite precursor solution,the bandgap of the resulting absorber material changed minimally;however,the nonradiative recombination diminished considerably as revealed by time-resolved photoluminescence and electroluminescence ***,using capacitance-frequency measurements,we were able to correlate the hysteresis features exhibited by the PSCs with interfacial charge *** study opens up a path to realize new record efciencies for PSCs based on guanidinium iodide doped perovskite flms.

关键词： perovskite iodide absorber

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Synthesis and Thermal Characterization of Solar Salt-Based Phase Change Composites with Graphene Nanoplatelets

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Journal of Thermal Science 2024年第2期33卷 491-500页

作者： Pethurajan VIGNESHWARAN Saboor shaik Sivan SURESH müslüm ARICI Asif AFZAL Department of Thermal and Energy Engineering School of Mechanical Engineering(SMEC)Vellore Institute of TechnologyVelloreTamil NaduIndia Nanotechnology Research Laboratory Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliTamil NaduIndia mechanical Engineering Department Engineering FacultyKocaeli UniversityUmuttepe CampusKocaeli41001Turkey Department of mechanical Engineering P.A.College of Engineering(affiliated to Visvesvaraya Technological UniversityBelagavi)Mangaluru574153India

Thermal energy storage(TES) systems use solar energy despite its irregular availability and day-night temperature *** work reports the thermal characterizations of solar salt-based phase change composites in the presence of graphene nanoplatelets(GNP).Solar salt(60:40 of NaNO_(3):KNO_(3)) possessing phase transition temperature and melting enthalpy of 221.01℃ and 134.58 kJ/kg is proposed as a phase change material(PCm) for high-temperature solar-based energy storage *** conductivity must be improved to make them suitable for widespread applications and to close the gap between the system needs where they are *** is added at weight concentrations of 0.1%,0.3%,and 0.5% with solar salt using the ball milling method to boost its thermal *** studies indicated the formation of a uniform surface of GNP on solar *** spectrum peaks identified the physical interaction between salt and *** characterization of the composites,such as thermal conductivity,DSC and TGA was carried out for the samples earlier and later 300 thermal cycles.0.5% of GNP has improved the thermal conductivity of salt by 129.67% and after thermal cycling,the enhancement reduced to 125.21% indicating that thermal cycling has a minor impact on thermal *** change temperature decreased by around 2.32% in the presence of0.5% GNP and the latent heat reduced by 4.34% after thermal *** thermograms depicted the composites initiated the weight loss at around 550℃ after which it was *** thermal cycling,the weight loss initiated at ~40℃ lower compared to pure salt,which was found to be a minor *** characterization of solar salt and GNP-based solar salt composites revealed that the composites can be used for enhanced heat transfer in high-temperature solar-based heat transfer and energy storage applications.

关键词： thermal energy storage high temperature solar salt graphene nanoplatelets thermal characterization

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Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics

Nanoscale interfacial engineering enables highly stable and ...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Anurag Krishna Hong Zhang Zhiwen Zhou Thibaut Gallet mathias Dankl Olivier Ouellette Felix T.Eickemeyer Fan Fu mounir mensi shaik m.zakeeruddin Ursula Rothlisberger G.N.manjunatha Reddy Alex Redinger michael Gr?tzel Anders Hagfeldt Laboratory of Photomolecular Science Institute of Chemical Sciences and Engineeringécole Polytechnique Fédérale de Lausanne Laboratory of Photonics and Interfaces école Polytechnique Fédérale de Lausanne

Long-term operational stability remains the primary concern for perovskite solar cells. Consequently, there is a quest for searching for new compositions that enable stable and efficient perovskites. We report a new molecular-level interface engineering strategy using a multifunctional ligand that augments long-term operational and thermal stability by chemically modifying the formamidinium lead iodide rich photoactive layer. The surface derivatized solar cells exhibited high operational stability(maximum powering point tracking at 1 sun) with a stabilized T80(the time over which the device efficiency reduces to 80% of its initial value of post-burn-in) of ≈5950 h at 40 oC and stabilized efficiency over 23%. The origin of high device stability and performance is correlated to the nano/subnanoscale molecular level interactions between ligand and perovskite layer, which is corroborated by comprehensive multiscale characterization. Our results provide key insights into the modulation of the grain boundaries, local density of states, surface bandgap, and interfacial recombination. Chemical analysis of the aged devices showed that interface passivation inhibited ion migration and prevented photoinduced I2 release that irreversibly degrades the perovskite. This study shows that passivating ligands have the potential to overcome stability issues associated with the high performing hybrid perovskite compositions, thus allowing a step closer to achieving long-standing stability of perovskitebased solar cells.

关键词： perovskite solar cells supramolecular chemistry molecular passivation grain boundaries defects operational stability

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Ibuprofen-Induced Toxic Epidermal Necrolysis:A Case Report

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International Journal of Dermatology and Venereology 2024年第2期7卷 108-110页

作者： Nevin Kannappilly mohamed Z.Peediyakkal mohamad Y.Khatib Dore C.Ananthegowda moustafa S.Elshafei Hani El Zeer Karimulla S.shaik moayad m.AlFayoumi Dyaneshwar P.mutkule Ahmed A.Soliman Abdulqadir J.Nashwan Critical Care Department Hamad Medical Corporation(HMC)Doha 3050Qatar

Introduction:Toxic epidermal necrolysis(TEN)is a medical emergency that most commonly occurs as an adverse effect of certain ***,we describe a case of a 41-year-old man with no comorbid illness who developed *** presentation:The patient had been prescribed ibuprofen for myalgia and developed skin lesions after the single *** lesions were erythematous papules and macules distributed all over the body after ibuprofen *** was diagnosed based on the patient’s clinical presentation and laboratory *** was treated with intravenous dexamethasone,intravenous immunoglobulin,and *** dressing changes and skin care was done with saline,chlorhexidine,and liquid *** patient was intubated and tracheostomized,and he gradually improved and ***,he developed septicemia in the intensive care unit and was treated ***:The management of TEN includes cessation of the causative cause,multidisciplinary intensive care unit(ICU)care,prevention and early detection of sepsis,fluid and electrolyte balance,adequate analgesia and temperature control,proper organ support,aggressive nutritional management,and good psychological *** pharmacological therapy for TEN includes corticosteroids,intravenous immunoglobulin,and *** key elements of management are aseptic care and proper dressing of the ***:TEN is associated with high mortality if not managed in a systemic and protocolized way.

关键词： ibuprofen toxic epidermal necrolysis erythema drug-induced erythema

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Artificial neural network model of non-Darcy mHD Sutterby hybrid nanofluid flow over a curved permeable surface:Solar energy applications

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Propulsion and Power Research 2023年第3期12卷 410-427页

作者： shaik Jakeer maduru Lakshmi Rupa Seethi Reddy Reddisekhar Reddy A.m.Rashad Centre for Computational modeling Chennai Institute of TechnologyChennai 600069India Department of mathematics S.A.S.Vellore Institute of TechnologyVellore 632014India Department of mathematics Koneru Lakshmaiah Education FoundationBowrampetHyderabad 500043TelanganaIndia Department of mathematics Aswan UniversityFaculty of ScienceAswan 81528Egypt

The conversion of solar radiation to thermal energy has recently much interest as the requirement for renewable heat and power *** to their enhanced ability to promote heat transmission,nanofluids can significantly improve solar-thermal systems’*** section aims to study the heat transfer behavior of the Sutterby hybrid nanofluid flow of magnetohydrodynamics in the presence of a non-uniform heat source/sink and linear thermal radiation over a non-Darcy curved permeable surface.A novel implementation of an intelligent numerical computing solver based on multi-layer perceptron(mLP)feed-forward back-propagation artificial neural network(ANN)with the Levenberg-marquard algorithm is provided in the current *** were gathered for the ANN model’s testing,certification,and *** mathematical equations are nonlinear,which are resolved for velocity,the temperature in addition to the skin friction coefficient,and the rate of heat transfer by using the bvp4c with mATLAB *** ANN model selects data,constructs and trains a network,then evaluates its efficacy via mean square *** illustrate the impact of a wide range of physical factors on variables,including pressure,velocity,and *** the entire study,the thermal energy improved by the SiO2(silicon dioxide)-Au(gold)hybrid nanofluid than the SiO2-TiO2(titanium dioxide)hybrid *** higher internal heat generation/absorption parameter values increase the temperature.

关键词： ANN model Sutterby hybrid nanofluid magnetic field Non-DarcyForchheimer Curved surface Radiation

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In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： manchi Nagaraju S.Chandra Sekhar Bhimanaboina Ramulu shaik Junied Arbaz Jae Su Yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoSeO3-mg Se O4,CmS) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32mg0.68O4,CmO) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CmO samples at different growth times by keeping the temperature *** CmO electrode designed for 8 h of growth time (CmO-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CmO electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CmO-8 h sample to form the CmS *** 3 m A cm-2,the resulted CmS exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CmO-8 h ***,an asymmetric cell fabricated with CmS as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32mg0.68O4 CoSeO3–mgSeO4 In situ formation Energy storage Asymmetric cell

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Longwave infrared multispectral image sensor system using aluminum-germanium plasmonic filter arrays Noor E

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Nano Research 2023年第7期16卷 10018-10025页

作者： Karishma shaik Bryce Widdicombe Dechuan Sun Sam E John Dongryeol Ryu Ampalavanapillai Nirmalathas Ranjith R Unnithan Department of Electrical and Electronic Engineering University of MelbourneParkvilleVIC 3010Australia Department of Biomedical Engineering University of MelbourneParkvilleVIC 3010Australia Department of Infrastructure Engineering University of MelbourneParkvilleVIC 3010Australia

A multispectral camera records image data in various wavelengths across the electromagnetic spectrum to acquire additional information that a conventional camera fails to *** the advent of high-resolution image sensors and color filter technologies,multispectral imagers in the visible wavelengths have become popular with increasing commercial viability in the last ***,multispectral imaging in longwave infrared(LWIR,8-14μm)is still an emerging area due to the limited availability of optical materials,filter technologies,and high-resolution *** from LWIR multispectral cameras can capture emission spectra of objects to extract additional information that a human eye fails to capture and thus have important applications in precision agriculture,forestry,medicine,and object *** this work,we experimentally demonstrate an LWIR multispectral image sensor with three wavelength bands using optical elements made of an aluminum(Al)-based plasmonic filter array sandwiched in germanium(Ge).To realize the multispectral sensor,the filter arrays are then integrated into a three-dimensional(3D)printed wheel stacked on a low-resolution monochrome thermal *** prototype device is calibrated using a blackbody and its thermal output has been enhanced with computer vision *** applying a state-of-theart deep learning method,we have also reconstructed multispectral images to a better spatial ***,our work demonstrates a versatile spectral thermography technique for detecting target signatures in the LWIR range and other advanced spectral analyses.

关键词： infrared plasmonics germanium(Ge) aluminum(Al) thermal optics longwave infrared(LWIR)multispectral system

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Developing mg–Zn surface alloy by friction surface allosying: In vitro degradation studies in simulated body fluids

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International Journal of minerals,metallurgy and materials 2020年第7期27卷 962-969页

作者： Venkateswarlu Badisha Shabana shaik Ravikumar Dumpala B.Ratna Sunil Department of metallurgical and materials Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of mechanical Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India Department of mechanical Engineering Bapatla Engineering CollegeBapatla 522101India

A new variant of friction-assisted process named friction surface alloying(FSA)for developing surface alloys was demonstrated in the present *** FSA,the dispersed phase is melted and allowed to react with the matrix material to form an alloy at the surface of a metallic *** the present work,magnesium(mg)sheets and zinc(Zn)powder were selected,and fine grained(~3.5μm)mg–Zn surface alloy with improved hardness was produced by FSA.X-ray diffraction studies confirmed the formation of intermetallic phases of mg and Zn at the *** the in vitro degradation studies carried out by immersing in simulated body fluids,a lower corrosion rate was observed for the mg–Zn surface alloy compared with pure *** surface morphologies after immersion studies indicated large degraded areas on the base mg compared with mg–*** results demonstrate the potential of FSA in developing mg-based surface alloys without melting the substrate to impart better surface properties.

关键词： friction stir processing,surface alloy magnesium zinc corrosion degradation

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Intra-procedural arrhythmia during cardiac catheterization: A systematic review of literature

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World Journal of Cardiology 2020年第6期12卷 269-284页

作者： Fatima A shaik David J Slotwiner Gregory m Gustafson Xuming Dai Division of Cardiology New York Presbyterian Queens HospitalFlushingNY 11355United States

BACKGROUND Cardiac catheterization is among the most performed medical procedures in the modern *** were sporadic reports indicating that cardiac arrhythmias are common during cardiac catheterization,and there are risks of developing serious and potentially life-threatening arrhythmias,such as sustained ventricular tachycardia(VT),ventricular fibrillation(VF)and high-grade conduction disturbances such as complete heart block(CHB),requiring immediate ***,there is lack of systematic overview of these *** To systematically review existing literature and gain better understanding of the incidence of cardiac arrhythmias during cardiac catheterization,and their impact on outcomes,as well as potential approaches to minimize this *** We applied a combination of terms potentially used in reports describing various cardiac arrhythmias during common cardiac catheterization procedures to systematically search Pubmed,EmBASE and Cochrane databases,as well as references of full-length *** During right heart catheterization(RHC),the incidence of atrial arrhythmias(premature atrial complexes,atrial fibrillation and flutter)was low(mias were usually transient and *** associated with the development of a new RBBB at a rate of 0.1%-0.3%in individuals with normal conduction system but up to 6.3%in individuals with pre-existing left bundle branch *** patients may require temporary pacing due to transient *** premature ventricular complexes or non-sustained VT are common during RHC(up to 20%of cases).Sustained ventricular arrhythmias(VT and/or VF)requiring either withdrawal of catheter or cardioversion occurred infrequently(1%-1.3%).During left heart catheterizations(LHC),the incidence of ventricular arrhythmias has declined significantly over the last few decades,from 1.1%historically to 0.1%*** overall reported rate of VT/VF in diagnostic LHC and coronary angiography is 0.8

关键词： Catheterization Coronary angiography Percutaneous coronary intervention Ventricular fibrillation Ventricular tachycardia

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