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Thin film

About: Thin film is a(n) research topic. Over the lifetime, 275512 publication(s) have been published within this topic receiving 4515633 citation(s). more


Open accessJournal ArticleDOI: 10.1038/SREP00591
Hui-Seon Kim1, Chang-Ryul Lee1, Jeong-Hyeok Im1, Ki Beom Lee1  +8 moreInstitutions (2)
21 Aug 2012-Scientific Reports
Abstract: We report on solid-state mesoscopic heterojunction solar cells employing nanoparticles (NPs) of methyl ammonium lead iodide (CH3NH3)PbI3 as light harvesters. The perovskite NPs were produced by reaction of methylammonium iodide with PbI2 and deposited onto a submicron-thick mesoscopic TiO2 film, whose pores were infiltrated with the hole-conductor spiro-MeOTAD. Illumination with standard AM-1.5 sunlight generated large photocurrents (JSC) exceeding 17 mA/cm2, an open circuit photovoltage (VOC) of 0.888 V and a fill factor (FF) of 0.62 yielding a power conversion efficiency (PCE) of 9.7%, the highest reported to date for such cells. Femto second laser studies combined with photo-induced absorption measurements showed charge separation to proceed via hole injection from the excited (CH3NH3)PbI3 NPs into the spiro-MeOTAD followed by electron transfer to the mesoscopic TiO2 film. The use of a solid hole conductor dramatically improved the device stability compared to (CH3NH3)PbI3 -sensitized liquid junction cells. more

Topics: Perovskite solar cell (60%), Methylammonium halide (57%), Methylammonium lead halide (57%) more

5,830 Citations

Journal ArticleDOI: 10.1126/SCIENCE.1080615
Jian Wang1, Jeffrey B. Neaton2, Haimei Zheng1, Valanoor Nagarajan1  +10 moreInstitutions (5)
14 Mar 2003-Science
Abstract: Enhancement of polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO3, is reported. Structure analysis indicates that the crystal structure of film is monoclinic in contrast to bulk, which is rhombohedral. The films display a room-temperature spontaneous polarization (50 to 60 microcoulombs per square centimeter) almost an order of magnitude higher than that of the bulk (6.1 microcoulombs per square centimeter). The observed enhancement is corroborated by first-principles calculations and found to originate from a high sensitivity of the polarization to small changes in lattice parameters. The films also exhibit enhanced thickness-dependent magnetism compared with the bulk. These enhanced and combined functional responses in thin film form present an opportunity to create and implement thin film devices that actively couple the magnetic and ferroelectric order parameters. more

Topics: Bismuth ferrite (63%), Thin film (55%), Ferroelectricity (54%) more

5,020 Citations

Journal ArticleDOI: 10.1038/NNANO.2008.83
Abstract: The integration of novel materials such as single-walled carbon nanotubes and nanowires into devices has been challenging, but developments in transfer printing and solution-based methods now allow these materials to be incorporated into large-area electronics1,2,3,4,5,6. Similar efforts are now being devoted to making the integration of graphene into devices technologically feasible7,8,9,10. Here, we report a solution-based method that allows uniform and controllable deposition of reduced graphene oxide thin films with thicknesses ranging from a single monolayer to several layers over large areas. The opto-electronic properties can thus be tuned over several orders of magnitude, making them potentially useful for flexible and transparent semiconductors or semi-metals. The thinnest films exhibit graphene-like ambipolar transistor characteristics, whereas thicker films behave as graphite-like semi-metals. Collectively, our deposition method could represent a route for translating the interesting fundamental properties of graphene into technologically viable devices. more

Topics: Graphene oxide paper (63%), Graphene (56%), Carbon nanotube (55%) more

3,970 Citations

Journal ArticleDOI: 10.1038/NATURE02308
A. Ohtomo1, Harold Y. Hwang2, Harold Y. Hwang1Institutions (2)
29 Jan 2004-Nature
Abstract: Polarity discontinuities at the interfaces between different crystalline materials (heterointerfaces) can lead to nontrivial local atomic and electronic structure, owing to the presence of dangling bonds and incomplete atomic coordinations. These discontinuities often arise in naturally layered oxide structures, such as the superconducting copper oxides and ferroelectric titanates, as well as in artificial thin film oxide heterostructures such as manganite tunnel junctions. If polarity discontinuities can be atomically controlled, unusual charge states that are inaccessible in bulk materials could be realized. Here we have examined a model interface between two insulating perovskite oxides--LaAlO3 and SrTiO3--in which we control the termination layer at the interface on an atomic scale. In the simple ionic limit, this interface presents an extra half electron or hole per two-dimensional unit cell, depending on the structure of the interface. The hole-doped interface is found to be insulating, whereas the electron-doped interface is conducting, with extremely high carrier mobility exceeding 10,000 cm2 V(-1) s(-1). At low temperature, dramatic magnetoresistance oscillations periodic with the inverse magnetic field are observed, indicating quantum transport. These results present a broad opportunity to tailor low-dimensional charge states by atomically engineered oxide heteroepitaxy. more

Topics: Electron mobility (55%), Heterojunction (54%), Perovskite (structure) (53%) more

3,571 Citations

Open accessBook
01 Jan 1969-
Abstract: Introduction. Basic theory. Antireflection coating. Neutral mirrors and beam splitters. Multilayer high-reflectance coatings. Edge filters. Band-pass filters. Tilted coatings. Production methods and thin-film materials. Factors affecting layer and coating properties. Layer uniformity and thickness monitoring. Specification of filters and environmental effects. System considerations: applications of filters and coatings. Other topics. Characteristics of thin-film dielectric materials. more

Topics: Optical filter (61%), Coating (56%), Thin film (53%) more

3,268 Citations

No. of papers in the topic in previous years

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Topic's top 5 most impactful authors

Markku Leskelä

324 papers, 20.6K citations

Mikko Ritala

293 papers, 19.1K citations

Chandrakant D. Lokhande

262 papers, 13.8K citations

Hiroshi Funakubo

245 papers, 4.2K citations

Jagdish Narayan

211 papers, 6K citations

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