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Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices (2019)

Abdi-Jalebi, M., Ibrahim Dar, M., Senanayak, S. P., Sadhanala, A., Andaji-Garmaroudi, Z., Pazos-Outon, L. M., Richter, J. M., Pearson, A. J., Sirringhaus, H., Grätzel, M., Friend, R. H.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2019

Beschreibung: 〈p〉One source of instability in perovskite solar cells (PSCs) is interfacial defects, particularly those that exist between the perovskite and the hole transport layer (HTL). We demonstrate that thermally evaporated dopant-free tetracene (120 nm) on top of the perovskite layer, capped with a lithium-doped Spiro-OMeTAD layer (200 nm) and top gold electrode, offers an excellent hole-extracting stack with minimal interfacial defect levels. For a perovskite layer interfaced between these graded HTLs and a mesoporous TiO〈sub〉2〈/sub〉 electron-extracting layer, its photoluminescence yield reaches 15% compared to 5% for the perovskite layer interfaced between TiO〈sub〉2〈/sub〉 and Spiro-OMeTAD alone. For PSCs with graded HTL structure, we demonstrate efficiency of up to 21.6% and an extended power output of over 550 hours of continuous illumination at AM1.5G, retaining more than 90% of the initial performance and thus validating our approach. Our findings represent a breakthrough in the construction of stable PSCs with minimized nonradiative losses.〈/p〉

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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Photon recycling in lead iodide perovskite solar cells (2016)

L. M. Pazos-Outon ; M. Szumilo ; R. Lamboll ; [weitere]

American Association for the Advancement of Science (AAAS)

In: Science. 351(6280): 1430-3. doi: 10.1126/science.aaf1168.

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Publikationsdatum: 2016-03-26

Beschreibung: Lead-halide perovskites have emerged as high-performance photovoltaic materials. We mapped the propagation of photogenerated luminescence and charges from a local photoexcitation spot in thin films of lead tri-iodide perovskites. We observed light emission at distances of 〉/=50 micrometers and found that the peak of the internal photon spectrum red-shifts from 765 to 〉/=800 nanometers. We used a lateral-contact solar cell with selective electron- and hole-collecting contacts and observed that charge extraction for photoexcitation 〉50 micrometers away from the contacts arose from repeated recycling between photons and electron-hole pairs. Thus, energy transport is not limited by diffusive charge transport but can occur over long distances through multiple absorption-diffusion-emission events. This process creates high excitation densities within the perovskite layer and allows high open-circuit voltages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pazos-Outon, Luis M -- Szumilo, Monika -- Lamboll, Robin -- Richter, Johannes M -- Crespo-Quesada, Micaela -- Abdi-Jalebi, Mojtaba -- Beeson, Harry J -- Vrucinic, Milan -- Alsari, Mejd -- Snaith, Henry J -- Ehrler, Bruno -- Friend, Richard H -- Deschler, Felix -- New York, N.Y. -- Science. 2016 Mar 25;351(6280):1430-3. doi: 10.1126/science.aaf1168.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, UK. ; Department of Chemistry, University of Cambridge, CB2 1EW Cambridge, UK. ; Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU Oxford, UK. ; Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands. ; Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, UK. rhf10@cam.ac.uk fd297@cam.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27013728" target="_blank"〉PubMed〈/a〉

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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A computer-based system for processing geophysical data obtained from boreholes (1983)

Richter, J. M.

Springer

Mathematical geology 15 (1983), S. 371-384

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ISSN: 1573-8868

Schlagwort(e): geophysical logging ; data processing ; data management ; computer graphics

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Mathematik

Notizen: Abstract A diverse set of computer programs has been developed at the Lawrence Livermore National Laboratory (LLNL)to process geophysical data obtained from boreholes. These programs support such services as digitizing analog records, reading and processing raw data, cataloging and storing processed data, retrieving selected data for analysis, and generating data plots on several different devices. A variety of geophysical data types are accommodated, including both wireline logs and laboratory analyses of downhole samples. Many processing tasks are handled by means of a single, flexible, general-purpose, data-manipulation program. Separate programs are available for processing data from density, gravity, velocity, and epithermal neutron logs. The computer-based storage and retrieval system, which has been in operation since 1973, currently contains over 4400 data files. Most of this data was obtained from the Nevada Test Site (NTS)in conjunction with the nuclear test program. Each data file contains a single geophysical parameter as a function of depth. Automatic storage and retrieval are facilitated by the assignment of unique file names that define the storage location of each data file. Files of interest to the user may be located and retrieved by means of a search program that examines the catalog. A convention recognized by all programs in the system is that of a zero ordinate denoting a gap in an otherwise continuous data trace. This convention provides a simple mechanism for editing and displaying data files in an automated and consistent manner.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01036077

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Long-range exciton transport in conjugated polymer nanofibers prepared by seeded growth (2018)

Jin, X.-H., Price, M. B., Finnegan, J. R., Boott, C. E., Richter, J. M., Rao, A., Menke, S. M., Friend, R. H., Whittell, G. R., Manners, I.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2018-05-25

Beschreibung: Easily processed materials with the ability to transport excitons over length scales of more than 100 nanometers are highly desirable for a range of light-harvesting and optoelectronic devices. We describe the preparation of organic semiconducting nanofibers comprising a crystalline poly(di- n -hexylfluorene) core and a solvated, segmented corona consisting of polyethylene glycol in the center and polythiophene at the ends. These nanofibers exhibit exciton transfer from the core to the lower-energy polythiophene coronas in the end blocks, which occurs in the direction of the interchain - stacking with very long diffusion lengths (〉200 nanometers) and a large diffusion coefficient (0.5 square centimeters per second). This is made possible by the uniform exciton energetic landscape created by the well-ordered, crystalline nanofiber core.

Schlagwort(e): Materials Science

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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High-performance light-emitting diodes based on carbene-metal-amides (2017)

Di, D., Romanov, A. S., Yang, L., Richter, J. M., Rivett, J. P. H., Jones, S., Thomas, T. H., Abdi Jalebi, M., Friend, R. H., Linnolahti, M., Bochmann, M., Credgington, D.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-04-15

Beschreibung: Organic light-emitting diodes (OLEDs) promise highly efficient lighting and display technologies. We introduce a new class of linear donor-bridge-acceptor light-emitting molecules, which enable solution-processed OLEDs with near-100% internal quantum efficiency at high brightness. Key to this performance is their rapid and efficient utilization of triplet states. Using time-resolved spectroscopy, we establish that luminescence via triplets occurs within 350 nanoseconds at ambient temperature, after reverse intersystem crossing to singlets. We find that molecular geometries exist at which the singlet-triplet energy gap (exchange energy) is close to zero, so that rapid interconversion is possible. Calculations indicate that exchange energy is tuned by relative rotation of the donor and acceptor moieties about the bridge. Unlike other systems with low exchange energy, substantial oscillator strength is sustained at the singlet-triplet degeneracy point.

Schlagwort(e): Physics

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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