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  • American Association for the Advancement of Science (AAAS)  (3)
  • 2015-2019  (3)
  • 1
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    [Report] Photon recycling in lead iodide perovskite solar cells (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-03-25
    Description: 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. Authors: Luis M. Pazos-Outón, Monika Szumilo, Robin Lamboll, Johannes M. Richter, Micaela Crespo-Quesada, Mojtaba Abdi-Jalebi, Harry J. Beeson, Milan Vrućinić, Mejd Alsari, Henry J. Snaith, Bruno Ehrler, Richard H. Friend, Felix Deschler
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈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〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Photon recycling in lead iodide perovskite solar cells (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-03-26
    Description: 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
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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