Structure And Photovoltaic Properties Of Strongly Correlated Manganite Titanite Heterojunctions
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| Author | : Benedikt Ifland |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
In the present thesis the photovoltaic (PV) effect in strongly correlated manganite/titanite heterostructures is investigated. As a model system thin films of Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (PCMO) were deposited on single crystalline SrTi$_{0.998}$Nb$_{0.002}$O$_{3}$ (STNO) substrates. In particular, PCMO with a doping level of x=0.35 is a suitable material to investigate the PV effect in correlated solar cells, because PCMO reveals high absorbtance in nearly the entire solar spectrum. In addition the appearance of long living hot polaronic states after a primary excitation with light can be o...
| Author | : Zhenping Wu |
| Publisher | : Open Dissertation Press |
| Total Pages | : |
| Release | : 2017-01-26 |
| Genre | : |
| ISBN | : 9781361307700 |
This dissertation, "Studies on thin films and heterojunctions of electron/hole-doped perovskite manganites" by Zhenping, Wu, 吴真平, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Intensive research interests in condensed matter physics have been focused at the strongly correlated electron systems. Most of the efforts were devoted in hole-doped manganites with a double exchange interaction between Mn3+/Mn4+. Recently, tetravalent ions substitution has also stimuli much attention as a supplement for the hole-doping. Such electron-doped manganites may be of great potential for the development of all-manganites devices. Manganites are extremely sensitive to external disturbances, such as magnetic fields, electric fields, currents, mechanical strain, and photo illumination, etc. These extraordinary properties make manganites promising for practical applications. In this thesis, the field modulation on physical properties in electron/hole-doped manganites films and heterojunctions were investigated. The effects of tetravalent hafnium doping on the structural, transport, and magnetic properties of polycrystalline La1-xHfxMnO3(LHMO) (0.05 Heterojunctions composed of n-type SrTiO3-δand p-type GaAs exhibited excellent rectifying behavior from 40K to room temperature. The photocarrier injection effect and a colossal photo-resistance were observed. Strong dependences on both temperature and bias voltage were found as well, which might be under stood by considering the band structure of the formed p-njunction. By employing an ultrathin SrTiO3buffer layer, La0.8Ca0.2MnO3films could be epitaxially grown on GaAs substrates. The heterostructures exhibit good rectifying behavior with a paramagnetic-ferromagnetic transition at 200K. The variation of diffusion voltage with temperature in these heterostructures could be explained by the effects of the Hund's rule coupling between the La0.8Ca0.2MnO3and the buffer layer. The effects of the strain induced by ferroelectric poling on the magnetic and electric properties have been investigated by using 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-PT) substrates. The polarization of the PMN-PT crystal reduces the biaxial tensile strain in the formed La0.9Hf0.1MnO3layer.It results in a significant decrease in resistance and an enhancement of the phase transition temperature as well as the magnetization. The impact of the lattice strain on the charge/orbital ordering state was also been studied. The modification of charge/orbital ordering phase by the electric fields and ferroelectric polarization suggested that the unstable states in the manganites are sensitive to the strain. Heterojunctions of La1-xHfxMnO3/Nb: SrTiO3 were fabricated and investigated under different fields (electric, magnetic and optic). These heterojunctions exhibited excellent rectifying behavior in a wide temperature range. Their properties could be significantly modulated by magnetic fields. Prominent photovoltaic effect was also observed in the formed junctions. DOI: 10.5353/th_b4979930 Subjects: Thin films Heteroju
| Author | : K.H.J. Buschow |
| Publisher | : Gulf Professional Publishing |
| Total Pages | : 606 |
| Release | : 2001 |
| Genre | : Science |
| ISBN | : 9780444506665 |
Volume 13 of the Handbook of Magnetic Materials, as the preceding volumes, has a dual purpose. As a textbook it is intended to be of assistance to those who wish to be introduced to a given topic in the field of magnetism without the need to read the vast amount of literature published. As a work of reference it is intended for scientists active in magnetism research. To this dual purpose, Volume 13 of the Handbook is composed of topical review articles written by leading authorities. In each of these articles an extensive description is given in graphical as well as in tabular form, much emphasis being placed on the discussion of the experimental material in the framework of physics, chemistry and material science. In Chapter 1 of this volume a general review of the experimental work on interlayer exchange coupling is presented along with a discussion of the current understanding of this field. There exists an extensive amount of scientific efforts devoted to 4f and 5f systems, including experimental and theoretical, as well as basic and applied research. Chapter 2 aims at reviewing a part of these efforts from the viewpoint of microscopic theory. Special attention is paid to the many new developments in the field. One of the intentions is to bring to the fore the darker areas of DFT theory applications. A review of novel experimental results and first-principle energy-band calculations of MOKE spectra will be presented in Chapter 3. Conventional co-operative phenomena, such as long-range order and elementary excitation, have realisations in nonmagnetic situations. This applies also to the phenomena of geometrical frustration. In Chapter 4 this topic is addressed by developing the basic principles underlying the magnetic phenomena.
| Author | : Robert Hull |
| Publisher | : IET |
| Total Pages | : 1054 |
| Release | : 1999 |
| Genre | : Electronic books |
| ISBN | : 9780852969335 |
A unique and well-organized reference, this book provides illuminating data, distinctive insight and expert guidance on silicon properties.
| Author | : Elbio Dagotto |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 465 |
| Release | : 2013-03-14 |
| Genre | : Science |
| ISBN | : 366205244X |
The study of the spontaneous formation of nanostructures in single crystals of several compounds is now a major area of research in strongly correlated electrons. These structures appear to originate in the competition of phases. The book addresses nanoscale phase separation, focusing on the manganese oxides known as manganites that have the colossal magnetoresistance (CMR) effect of potential relevance for device applications. It is argued that the nanostructures are at the heart of the CMR phenomenon. The book contains updated information on manganite research directed to experts, both theorists and experimentalists. However, graduate students or postdocs will find considerable introductory material, including elements of computational physics.
| Author | : Hongqi Sun |
| Publisher | : John Wiley & Sons |
| Total Pages | : 480 |
| Release | : 2021-04-29 |
| Genre | : Science |
| ISBN | : 3527825088 |
This comprehensive book systematically covers the fundamentals in solar energy conversion to chemicals, either fuels or chemical products. It includes natural photosynthesis with emphasis on artificial processes for solar energy conversion and utilization. The chemical processes of solar energy conversion via homogeneous and/or heterogeneous photocatalysis has been described with the mechanistic insights. It also consists of reaction systems toward a variety of applications, such as water splitting for hydrogen or oxygen evolution, photocatalytic CO2 reduction to fuels, and light driven N2 fixation, etc. This unique book offers the readers a broad view of solar energy utilization based on chemical processes and their perspectives for future sustainability.
| Author | : Pascal Granger |
| Publisher | : John Wiley & Sons |
| Total Pages | : 1050 |
| Release | : 2016-02-23 |
| Genre | : Technology & Engineering |
| ISBN | : 3527337636 |
This comprehensive handbook and ready reference details all the main achievements in the field of perovskite-based and related mixed-oxide materials. The authors discuss, in an unbiased manner, the potentials as well as the challenges related to their use, thus offering new perspectives for research and development on both an academic and industrial level. The first volume begins by summarizing the different synthesis routes from molten salts at high temperatures to colloidal crystal template methods, before going on to focus on the physical properties of the resulting materials and their related applications in the fields of electronics, energy harvesting, and storage as well as electromechanics and superconductivity. The second volume is dedicated to the catalytic applications of perovskites and related mixed oxides, including, but not limited to total oxidation of hydrocarbons, dry reforming of methane and denitrogenation. The concluding section deals with the development of chemical reactors and novel perovskite-based applications, such as fuel cells and high-performance ceramic membranes. Throughout, the contributions clearly point out the intimate links between structure, properties and applications of these materials, making this an invaluable tool for materials scientists and for catalytic and physical chemists.
| Author | : Likun Pan |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 652 |
| Release | : 2016-02-03 |
| Genre | : Technology & Engineering |
| ISBN | : 9535122452 |
The book summarizes the current state of the know-how in the field of perovskite materials: synthesis, characterization, properties, and applications. Most chapters include a review on the actual knowledge and cutting-edge research results. Thus, this book is an essential source of reference for scientists with research fields in energy, physics, chemistry and materials. It is also a suitable reading material for graduate students.
| Author | : Michael D. Kaplan |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 378 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 9401009856 |
This book is based mostly on the reports presented at the XVth International lahn-Teller Symposium on Vibronic Interactions in Crystals and Molecules and NATO Advanced Research Workshop Colossal Magnetoresistance and Vibronic Interactions that took place at Boston on August 16-22 of the year 2000. This is the first time the Symposium took place in the USA where recently the giant splash of the attention to the 1 ahn-Teller effect occurred. This tremendous interest to the field all over the world is reflected not only in the numerous publications in many American and European 10urnals, but of the leading scientists from additionally in the Symposium's participation the well known Universities, National Laboratories and industrial companies, which was the largest in the history of the Symposium. The renaissance of the 1ahn-Teller physics is closely related to the three fundamental discoveries in science. The most significant among them is the discovery of high-Tc superconductivity by K. -A. Muller and G. Bednorz, for whom the "1ahn-Teller idea" was the motivation in their search. The result of this search is well known - a wide spectrum of the 1ahn-Teller ion based materials with Tc between 24K and 135K were found. The second discovery is the existence of a new polymorph of carbon - the C60. The microscopic analysis of all physical, chemical and biological properties of the buckyballs is based on 1ahn-Teller type of interactions. The third is colossal magnetoresistance.
| Author | : Dragan Uskoković |
| Publisher | : Institute of Technical Sciences of the Serbian Academy of Sciences and Arts |
| Total Pages | : 270 |
| Release | : 2010-08-01 |
| Genre | : Science |
| ISBN | : 8680321257 |
The First Conference on materials science and engineering, including physics, physical chemistry, condensed matter chemistry, and technology in general, was held in September 1995, in Herceg Novi. An initiative to establish Yugoslav Materials Research Society was born at the conference and, similar to other MR societies in the world, the programme was made and objectives determined. The Yugoslav Materials Research Society (Yu-MRS), a nongovernment and non-profit scientific association, was founded in 1997 to promote multidisciplinary goal-oriented research in materials science and engineering. The main task and objective of the Society has been to encourage creativity in materials research and engineering to reach a harmonic coordination between achievements in this field in our country and analogous activities in the world with an aim to include our country into global international projects. Until 2003, Conferences were held every second year and then they grew into Annual Conferences that were traditionally held in Herceg Novi in September of every year. In 2007 Yu-MRS formed two new MRS: MRS-Serbia (official successor of Yu-MRS) and MRS-Montenegro (in founding). In 2008, MRS – Serbia became a member of FEMS (Federation of European Materials Societies). The Twelfth Annual Conference YUCOMAT 2010 was held on September 6-10, 2010 in Heceg Novi, Montenegro
