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It Takes Two to Tan...
It Takes Two to Tango - Double-Layer Selective Contacts in Perovskite Solar Cells for Improved Device Performance and Reduced Hysteresis
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- Kegelmann, Lukas (author)
- Helmholtz Association of German Research Centers
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- Wolff, Christian M. (author)
- University of Potsdam
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- Awino, Celline (author)
- Helmholtz Association of German Research Centers
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- Lang, Felix (author)
- Helmholtz Association of German Research Centers
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- Unger, Eva L. (author)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Helmholtz Association of German Research Centers
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- Korte, Lars (author)
- Helmholtz Association of German Research Centers
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- Dittrich, Thomas (author)
- Helmholtz Association of German Research Centers
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- Neher, Dieter (author)
- University of Potsdam
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- Rech, Bernd (author)
- Helmholtz Association of German Research Centers
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- Albrecht, Steve (author)
- Helmholtz Association of German Research Centers
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(creator_code:org_t)
- 2017-05-08
- 2017
- English 11 s.
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In: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 9:20, s. 17245-17255
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http://dx.doi.org/10...
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Abstract
Subject headings
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- Solar cells made from inorganic-organic perovskites have gradually approached market requirements as their efficiency and stability have improved tremendously in recent years. Planar low-temperature processed perovskite solar cells are advantageous for possible large-scale production but are more prone to exhibiting photocurrent hysteresis, especially in the regular n-i-p structure. Here, a systematic characterization of different electron selective contacts with a variety of chemical and electrical properties in planar n-i-p devices processed below 180 °C is presented. The inorganic metal oxides TiO2 and SnO2, the organic fullerene derivatives C60, PCBM, and ICMA, as well as double-layers with a metal oxide/PCBM structure are used as electron transport materials (ETMs). Perovskite layers deposited atop the different ETMs with the herein applied fabrication method show a similar morphology according to scanning electron microscopy. Further, surface photovoltage spectroscopy measurements indicate comparable perovskite absorber qualities on all ETMs, except TiO2, which shows a more prominent influence of defect states. Transient photoluminescence studies together with current-voltage scans over a broad range of scan speeds reveal faster charge extraction, less pronounced hysteresis effects, and higher efficiencies for devices with fullerene compared to those with metal oxide ETMs. Beyond this, only double-layer ETM structures substantially diminish hysteresis effects for all performed scan speeds and strongly enhance the power conversion efficiency up to a champion stabilized value of 18.0%. The results indicate reduced recombination losses for a double-layer TiO2/PCBM contact design: First, a reduction of shunt paths through the fullerene to the ITO layer. Second, an improved hole blocking by the wide band gap metal oxide. Third, decreased transport losses due to an energetically more favorable contact, as implied by photoelectron spectroscopy measurements. The herein demonstrated improvements of multilayer selective contacts may serve as a general design guideline for perovskite solar cells.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- double-layer
- electron contact
- fullerene
- hysteresis
- metal oxide
- perovskite solar cell
- regular planar architecture
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Kegelmann, Lukas
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Wolff, Christian ...
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Awino, Celline
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Lang, Felix
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Unger, Eva L.
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Korte, Lars
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show more...
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Dittrich, Thomas
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Neher, Dieter
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Rech, Bernd
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Albrecht, Steve
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
- Articles in the publication
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ACS Applied Mate ...
- By the university
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Lund University