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Elucidating and Mit...
Elucidating and Mitigating Degradation Processes in Perovskite Light-Emitting Diodes
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- Andaji-Garmaroudi, Z. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Abdi-Jalebi, M. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.;UCL, Inst Mat Discovery, Torrington Pl, London WC1E 7JE, England.
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- Kosasih, F. U. (författare)
- Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England.
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- Doherty, T. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Macpherson, S. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Bowman, A. R. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Man, Gabriel (författare)
- Uppsala universitet,Energimaterialens fysik
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- Cappel, Ute B. (författare)
- KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden.
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- Rensmo, Håkan (författare)
- Uppsala universitet,Energimaterialens fysik
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- Ducati, C. (författare)
- Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England.
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- Friend, R. H. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Stranks, S. D. (författare)
- Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England.
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Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England Univ Cambridge, Cavendish Lab, Dept Phys, JJ Thomson Ave, Cambridge CB3 0HE, England.;UCL, Inst Mat Discovery, Torrington Pl, London WC1E 7JE, England. (creator_code:org_t)
- 2020-11-16
- 2020
- Engelska.
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Ingår i: Advanced Energy Materials. - : Wiley-VCH Verlag. - 1614-6832 .- 1614-6840. ; 10:48
- Relaterad länk:
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https://www.reposito...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Halide perovskites have attracted substantial interest for their potential as disruptive display and lighting technologies. However, perovskite light-emitting diodes (PeLEDs) are still hindered by poor operational stability. A fundamental understanding of the degradation processes is lacking but will be key to mitigating these pathways. Here, a combination of in operando and ex situ measurements to monitor the performance degradation of (Cs0.06FA0.79MA0.15)Pb(I0.85Br0.15)3 PeLEDs over time is used. Through device, nanoscale cross-sectional chemical mapping, and optical spectroscopy measurements, it is revealed that the degraded performance arises from an irreversible accumulation of bromide content at one interface, which leads to barriers to injection of charge carriers and thus increased nonradiative recombination. This ionic segregation is impeded by passivating the perovskite films with potassium halides, which immobilizes the excess halide species. The passivated PeLEDs show enhanced external quantum efficiency (EQE) from 0.5% to 4.5% and, importantly, show significantly enhanced stability, with minimal performance roll-off even at high current densities (>200 mA cm−2). The decay half-life for the devices under continuous operation at peak EQE increases from <1 to ≈15 h through passivation, and ≈200 h under pulsed operation. The results provide generalized insight into degradation pathways in PeLEDs and highlight routes to overcome these challenges.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- degradation
- halide perovskites
- ion migration
- light-emitting diodes
- passivation
- Carrier mobility
- Perovskite
- Potassium compounds
- Continuous operation
- Degradation pathways
- External quantum efficiency
- High current densities
- Non-radiative recombinations
- Operational stability
- Optical spectroscopy
- Performance degradation
- Light emitting diodes
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Till lärosätets databas
- Av författaren/redakt...
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Andaji-Garmaroud ...
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Abdi-Jalebi, M.
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Kosasih, F. U.
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Doherty, T.
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Macpherson, S.
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Bowman, A. R.
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visa fler...
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Man, Gabriel
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Cappel, Ute B.
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Rensmo, Håkan
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Ducati, C.
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Friend, R. H.
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Stranks, S. D.
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visa färre...
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