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Open AccessArticle

Thiocyanate-Treated Perovskite-Nanocrystal-Based Light-Emitting Diodes with Insight in Efficiency Roll-Off

1
Optoelectronics, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
2
Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, via Dodecaneso 31, 16146 Genova, Italy
3
Nanochemistry Department, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
4
Materials Characterization Facility, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 367; https://doi.org/10.3390/ma13020367
Received: 13 December 2019 / Revised: 6 January 2020 / Accepted: 10 January 2020 / Published: 13 January 2020
Light emitting diodes (LED) based on halide perovskite nanocrystals (NC) have received widespread attention in recent years. In particular, LEDs based on CsPbBr3 NCs were the object of special interest. Here, we report for the first time green LED based on CsPbBr3 NCs treated with ammonium thiocyanate solution before purification with polar solvent. The champion device fabricated based on the treated CsPbBr3 NCs showed high efficiency and high stability during operation as well as during storage. A study on morphology and current distribution of NC films under applied voltages was carried out by conductive atomic force microscopy, giving a hint on efficiency roll-off. The current work provides a facile way to treat sensitive perovskite NCs and to fabricate perovskite NC-based LED with high stability. Moreover, the results shed new light on the relation between film morphology and device performance and on the possible mechanism of efficiency roll-off in NC LED. View Full-Text
Keywords: perovskite nanocrystal; light emitting diodes; thiocyanate; efficiency roll-off; conductive atomic force microscopy perovskite nanocrystal; light emitting diodes; thiocyanate; efficiency roll-off; conductive atomic force microscopy
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Chen, F.; Boopathi, K.M.; Imran, M.; Lauciello, S.; Salerno, M. Thiocyanate-Treated Perovskite-Nanocrystal-Based Light-Emitting Diodes with Insight in Efficiency Roll-Off. Materials 2020, 13, 367.

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