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Interface-assisted ...
Interface-assisted cation exchange enables high-performance perovskiteLEDs with tunable near-infrared emissions
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- Yuan, Zhongcheng (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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- Hu, Zhang-Jun (author)
- Linköpings universitet,Molekylär ytfysik och nanovetenskap,Tekniska fakulteten
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- Persson, Ingemar (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Wang, Chuan Fei (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Liu, Xianjie (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Kuang, Chaoyang (author)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Xu, Weidong (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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- Bai, Sai (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Univ Elect Sci & Technol China, Peoples R China
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- Gao, Feng (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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(creator_code:org_t)
- Cell Press, 2022
- 2022
- English.
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In: Joule. - : Cell Press. - 2542-4351. ; 6:10, s. 2423-2436
- Related links:
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Achieving high-quality cesium-formamidinium lead iodide (CsxFA1_xPbI3) perovskites with tunable band gaps is highly desired for optoelectronic applications including solar cells and light -emit-ting diodes (LEDs). Herein, by utilizing an alkaline-interface-assisted cation-exchange method, we fabricate highly emissive CsxFA1_x PbI3 perovskite films with fine-tunable Cs-FA alloying ratio for emis-sion-tunable near-infrared (NIR) LEDs. We reveal that the deproto-nation of FA+ cations and the formation of hydrogen-bonded gels consisting of CsI and FA facilitated by the zinc oxide underneath effectively removes the Cs-FA ion-exchange barrier, promoting the formation of phase-pure CsxFA1_xPbI3 films with tunable emis-sions filling the gap between that of pure Cs-and FA-based perov-skites. The obtained NIR perovskite LEDs (PeLEDs) peaking from 715 to 780 nm simultaneously demonstrate high peak external quantum efficiencies of over 15%, maximum radiances exceeding 300 W sr_1 m_2, and high power conversion efficiencies above 10% at 100 mA cm_2, representing the best-performing LEDs based on solution-processed NIR emitters in a similar region.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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