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Oriented Quasi-2D Perovskites for High Performance Optoelectronic Devices
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
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2018 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 30, no 51, article id 1804771Article in journal (Refereed) Published
Abstract [en]

Quasi-2D layered organometal halide perovskites have recently emerged as promising candidates for solar cells, because of their intrinsic stability compared to 3D analogs. However, relatively low power conversion efficiency (PCE) limits the application of 2D layered perovskites in photovoltaics, due to large energy band gap, high exciton binding energy, and poor interlayer charge transport. Here, efficient and water-stable quasi-2D perovskite solar cells with a peak PCE of 18.20% by using 3-bromobenzylammonium iodide are demonstrated. The unencapsulated devices sustain over 82% of their initial efficiency after 2400 h under relative humidity of approximate to 40%, and show almost unchanged photovoltaic parameters after immersion into water for 60 s. The robust performance of perovskite solar cells results from the quasi-2D perovskite films with hydrophobic nature and a high degree of electronic order and high crystallinity, which consists of both ordered large-bandgap perovskites with the vertical growth in the bottom region and oriented small-bandgap components in the top region. Moreover, due to the suppressed nonradiative recombination, the unencapsulated photovoltaic devices can work well as light-emitting diodes (LEDs), exhibiting an external quantum efficiency of 3.85% and a long operational lifetime of approximate to 96 h at a high current density of 200 mA cm(-2) in air.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 30, no 51, article id 1804771
Keywords [en]
multiple quantum wells; perovskites; solar cells; stability; two dimension
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-153680DOI: 10.1002/adma.201804771ISI: 000453926000008PubMedID: 30345566OAI: oai:DiVA.org:liu-153680DiVA, id: diva2:1275741
Note

Funding Agencies|National Basic Research Program of China-Fundamental Studies of Perovskite Solar Cells [2015CB932200]; European Union [2016YFE0112000]; Major Research Plan of the National Natural Science Foundation of China [91733302]; National Key Research and Development Program of China [2018YFB0406704, 2017YFB0404500]; Natural Science Foundation of Jiangsu Province, China [BK20150043, BK20170991, BK20150064]; Major Program of Natural Science Research of Jiangsu Higher Education Institutions of China [18KJA510002]; National Natural Science Foundation of China [61634001, 51703094, 11474164]; National Science Fund for Distinguished Young Scholars [61725502]; Synergetic Innovation Center for Organic Electronics and Information Displays

Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07

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