Core–shell carbon-polymer quantum dot passivation for near infrared perovskite light emitting diodes

Marinos Tountas, Anastasia Soultati, Konstantina-Kalliopi Armadorou, Kalliopi Ladomenou, Georgios Landrou, Apostolis Verykios, Maria-Christina Skoulikidou, Stylianos Panagiotakis, Petros-Panagis Fillipatos, Konstantina Yannakopoulou, Alexander Chroneos, Leonidas C Palilis, Abd Rashid Bin Mohd Yusoff, Athanassios G Coutsolelos, Panagiotis Argitis, Maria Vasilopoulou

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Abstract

Abstract: High-performance perovskite light-emitting diodes (PeLEDs) require a high quality perovskite emitter and appropriate charge transport layers to facilitate charge injection and transport within the device. Solution-processed n-type metal oxides represent a judicious choice for the electron transport layer (ETL); however, they do not always present surface properties and energetics compatible with the perovskite emitter. Moreover, the emitter itself exhibits poor nanomorphology and defect traps that compromise the device performance. Here, we modulate the surface properties and interface energetics between the tin oxide (SnO2) ETL with the perovskite emitter by using an amino functionalized difluoro{2-[1-(3,5-dimethyl-2H-pyrrol-2-ylidene-N)ethyl]-3,5-dimethyl-1H-pyrrolato-N}boron compound and passivate the defects present in the perovskite matrix with carbon-polymer core–shell quantum dots inserted into the perovskite precursor. Both these approaches synergistically improve the perovskite layer nanomorphology and enhance the radiative recombination. These properties resulted in the fabrication of near-infrared PeLEDs based on formamidinium lead iodide (FAPbI3) with a high radiance of 92 W sr−1 m−2, an external quantum efficiency (EQE) of 14%, reduced efficiency roll-off and prolonged lifetime. In particular, the modified device retained 80% of the initial EQE (T80) for 33 h compared to 6 h of the reference cell.
Original languageEnglish
Article number034007
Number of pages13
JournalJournal of Physics: Photonics
Volume4
Issue number3
DOIs
Publication statusPublished - 1 Jul 2022

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Funder


Funding Information: This research is co-financed by Greece and the European Union (European Social Fund-ESF) through the Operational Programmed «Human Resources Development, Education and Lifelong Learning» in the context of the project ‘Reinforcement of Postdoctoral Researchers—2nd Cycle’ (MIS-5033021), implemented by the State Scholarships Foundation (IKΥ).

Keywords

  • Paper
  • Focus on Grand Challenges in Halide Perovskites: Light-Emitting Perovskites - Materials, Devices and Emerging Phenomena
  • core–shell
  • carbon
  • polymer
  • quantum
  • dot
  • perovskite
  • light emitting diodes

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