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Improved performance of perovskite light-emitting diodes with a NaCl doped PEDOT:PSS hole transport layer

Huang, Xiaokun; Bäuerle, Rainer; Scherz, Felix; Tisserant, Jean-Nicolas; Kowalsky, Wolfgang; Lovrinčić, Robert; Hernandez-Sosa, Gerardo

Abstract:
We demonstrate a simple and effective way to enhance the performance of perovskite light-emitting diodes (PeLEDs) by utilizing an alkali halide doped PEDOT:PSS as the hole transport layer (HTL). The alkali halide (NaCl) doping helped the growth of the quasi-2D perovskite phases on top of the PEDOT:PSS, it also significantly reduced the exciton quenching in PEDOT:PSS based PeLEDs. More importantly, the doping reduced the work function of the PEDOT:PSS surface, which appropriately modulated the hole injection leading to improved charge balance. This helps to control the recombination zone inside the thin perovskite emitting layer (∼10 nm). The optimized blue-green PeLEDs with the NaCl doped PEDOT:PSS HTL showed a maximum luminance of 1487 cd m$^{-2}$, current efficiency of 2.16 cd A$^{-1}$ with a low turn-on voltage of 3.0 V, which are 217% and 567% higher than the PeLEDs with the pristine PEDOT:PSS layer (turn-on voltage: 3.3 V), respectively.

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Verlagsausgabe §
DOI: 10.5445/IR/1000131404
Veröffentlicht am 16.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2050-7534, 2050-7526
KITopen-ID: 1000131404
Erschienen in Journal of Materials Chemistry C
Verlag Royal Society of Chemistry (RSC)
Band 9
Heft 12
Seiten 4344-4350
Nachgewiesen in Scopus
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